+2008-08-14 Bruno Haible <bruno@clisp.org>
+
+ * lib/glthread/lock.h: Renamed from lib/lock.h.
+ * lib/glthread/lock.c: Renamed from lib/lock.c. Update includes.
+ * lib/glthread/tls.h: Renamed from lib/tls.h.
+ * lib/glthread/tls.c: Renamed from lib/tls.c. Update includes.
+ * lib/fstrcmp.c: Update includes.
+ * lib/strsignal.c: Update includes.
+ * modules/lock (Files, Makefile.am): Update.
+ (Include): Change to "glthread/lock.h".
+ * modules/tls (Files, Makefile.am): Update.
+ (Include): Change to "glthread/tls.h".
+ * tests/test-lock.c: Update includes.
+ * tests/test-tls.c: Update includes.
+ * NEWS: Mention the renamed header files.
+
2008-08-11 Jim Meyering <meyering@redhat.com>
* lib/fts_.h: Fix grammar (insert a missing "is") in a comment.
Date Modules Changes
+2008-08-14 lock The include file is changed from "lock.h"
+ to "glthread/lock.h".
+ tls The include file is changed from "tls.h"
+ to "glthread/tls.h".
+
2008-07-17 c-stack The module now requires the addition of
$(LIBCSTACK) or $(LTLIBCSTACK) in Makefile.am,
since it may depend on linking with libsigsegv.
/* Functions to make fuzzy comparisons between strings
- Copyright (C) 1988-1989, 1992-1993, 1995, 2001-2003, 2006 Free Software Foundation, Inc.
+ Copyright (C) 1988-1989, 1992-1993, 1995, 2001-2003, 2006, 2008
+ Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
#include <stdlib.h>
#include <limits.h>
-#include "lock.h"
-#include "tls.h"
+#include "glthread/lock.h"
+#include "glthread/tls.h"
#include "minmax.h"
#include "xalloc.h"
--- /dev/null
+/* Locking in multithreaded situations.
+ Copyright (C) 2005-2008 Free Software Foundation, Inc.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2, or (at your option)
+ any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software Foundation,
+ Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
+
+/* Written by Bruno Haible <bruno@clisp.org>, 2005.
+ Based on GCC's gthr-posix.h, gthr-posix95.h, gthr-solaris.h,
+ gthr-win32.h. */
+
+#include <config.h>
+
+#include "glthread/lock.h"
+
+/* ========================================================================= */
+
+#if USE_POSIX_THREADS
+
+/* Use the POSIX threads library. */
+
+# if PTHREAD_IN_USE_DETECTION_HARD
+
+/* The function to be executed by a dummy thread. */
+static void *
+dummy_thread_func (void *arg)
+{
+ return arg;
+}
+
+int
+glthread_in_use (void)
+{
+ static int tested;
+ static int result; /* 1: linked with -lpthread, 0: only with libc */
+
+ if (!tested)
+ {
+ pthread_t thread;
+
+ if (pthread_create (&thread, NULL, dummy_thread_func, NULL) != 0)
+ /* Thread creation failed. */
+ result = 0;
+ else
+ {
+ /* Thread creation works. */
+ void *retval;
+ if (pthread_join (thread, &retval) != 0)
+ abort ();
+ result = 1;
+ }
+ tested = 1;
+ }
+ return result;
+}
+
+# endif
+
+/* -------------------------- gl_lock_t datatype -------------------------- */
+
+/* ------------------------- gl_rwlock_t datatype ------------------------- */
+
+# if HAVE_PTHREAD_RWLOCK
+
+# if !defined PTHREAD_RWLOCK_INITIALIZER
+
+int
+glthread_rwlock_init_multithreaded (gl_rwlock_t *lock)
+{
+ int err;
+
+ err = pthread_rwlock_init (&lock->rwlock, NULL);
+ if (err != 0)
+ return err;
+ lock->initialized = 1;
+ return 0;
+}
+
+int
+glthread_rwlock_rdlock_multithreaded (gl_rwlock_t *lock)
+{
+ if (!lock->initialized)
+ {
+ int err;
+
+ err = pthread_mutex_lock (&lock->guard);
+ if (err != 0)
+ return err;
+ if (!lock->initialized)
+ {
+ err = glthread_rwlock_init_multithreaded (lock);
+ if (err != 0)
+ {
+ pthread_mutex_unlock (&lock->guard);
+ return err;
+ }
+ }
+ err = pthread_mutex_unlock (&lock->guard);
+ if (err != 0)
+ return err;
+ }
+ return pthread_rwlock_rdlock (&lock->rwlock);
+}
+
+int
+glthread_rwlock_wrlock_multithreaded (gl_rwlock_t *lock)
+{
+ if (!lock->initialized)
+ {
+ int err;
+
+ err = pthread_mutex_lock (&lock->guard);
+ if (err != 0)
+ return err;
+ if (!lock->initialized)
+ {
+ err = glthread_rwlock_init_multithreaded (lock);
+ if (err != 0)
+ {
+ pthread_mutex_unlock (&lock->guard);
+ return err;
+ }
+ }
+ err = pthread_mutex_unlock (&lock->guard);
+ if (err != 0)
+ return err;
+ }
+ return pthread_rwlock_wrlock (&lock->rwlock);
+}
+
+int
+glthread_rwlock_unlock_multithreaded (gl_rwlock_t *lock)
+{
+ if (!lock->initialized)
+ return EINVAL;
+ return pthread_rwlock_unlock (&lock->rwlock);
+}
+
+int
+glthread_rwlock_destroy_multithreaded (gl_rwlock_t *lock)
+{
+ int err;
+
+ if (!lock->initialized)
+ return EINVAL;
+ err = pthread_rwlock_destroy (&lock->rwlock);
+ if (err != 0)
+ return err;
+ lock->initialized = 0;
+ return 0;
+}
+
+# endif
+
+# else
+
+int
+glthread_rwlock_init_multithreaded (gl_rwlock_t *lock)
+{
+ int err;
+
+ err = pthread_mutex_init (&lock->lock, NULL);
+ if (err != 0)
+ return err;
+ err = pthread_cond_init (&lock->waiting_readers, NULL);
+ if (err != 0)
+ return err;
+ err = pthread_cond_init (&lock->waiting_writers, NULL);
+ if (err != 0)
+ return err;
+ lock->waiting_writers_count = 0;
+ lock->runcount = 0;
+ return 0;
+}
+
+int
+glthread_rwlock_rdlock_multithreaded (gl_rwlock_t *lock)
+{
+ int err;
+
+ err = pthread_mutex_lock (&lock->lock);
+ if (err != 0)
+ return err;
+ /* Test whether only readers are currently running, and whether the runcount
+ field will not overflow. */
+ /* POSIX says: "It is implementation-defined whether the calling thread
+ acquires the lock when a writer does not hold the lock and there are
+ writers blocked on the lock." Let's say, no: give the writers a higher
+ priority. */
+ while (!(lock->runcount + 1 > 0 && lock->waiting_writers_count == 0))
+ {
+ /* This thread has to wait for a while. Enqueue it among the
+ waiting_readers. */
+ err = pthread_cond_wait (&lock->waiting_readers, &lock->lock);
+ if (err != 0)
+ {
+ pthread_mutex_unlock (&lock->lock);
+ return err;
+ }
+ }
+ lock->runcount++;
+ return pthread_mutex_unlock (&lock->lock);
+}
+
+int
+glthread_rwlock_wrlock_multithreaded (gl_rwlock_t *lock)
+{
+ int err;
+
+ err = pthread_mutex_lock (&lock->lock);
+ if (err != 0)
+ return err;
+ /* Test whether no readers or writers are currently running. */
+ while (!(lock->runcount == 0))
+ {
+ /* This thread has to wait for a while. Enqueue it among the
+ waiting_writers. */
+ lock->waiting_writers_count++;
+ err = pthread_cond_wait (&lock->waiting_writers, &lock->lock);
+ if (err != 0)
+ {
+ lock->waiting_writers_count--;
+ pthread_mutex_unlock (&lock->lock);
+ return err;
+ }
+ lock->waiting_writers_count--;
+ }
+ lock->runcount--; /* runcount becomes -1 */
+ return pthread_mutex_unlock (&lock->lock);
+}
+
+int
+glthread_rwlock_unlock_multithreaded (gl_rwlock_t *lock)
+{
+ int err;
+
+ err = pthread_mutex_lock (&lock->lock);
+ if (err != 0)
+ return err;
+ if (lock->runcount < 0)
+ {
+ /* Drop a writer lock. */
+ if (!(lock->runcount == -1))
+ {
+ pthread_mutex_unlock (&lock->lock);
+ return EINVAL;
+ }
+ lock->runcount = 0;
+ }
+ else
+ {
+ /* Drop a reader lock. */
+ if (!(lock->runcount > 0))
+ {
+ pthread_mutex_unlock (&lock->lock);
+ return EINVAL;
+ }
+ lock->runcount--;
+ }
+ if (lock->runcount == 0)
+ {
+ /* POSIX recommends that "write locks shall take precedence over read
+ locks", to avoid "writer starvation". */
+ if (lock->waiting_writers_count > 0)
+ {
+ /* Wake up one of the waiting writers. */
+ err = pthread_cond_signal (&lock->waiting_writers);
+ if (err != 0)
+ {
+ pthread_mutex_unlock (&lock->lock);
+ return err;
+ }
+ }
+ else
+ {
+ /* Wake up all waiting readers. */
+ err = pthread_cond_broadcast (&lock->waiting_readers);
+ if (err != 0)
+ {
+ pthread_mutex_unlock (&lock->lock);
+ return err;
+ }
+ }
+ }
+ return pthread_mutex_unlock (&lock->lock);
+}
+
+int
+glthread_rwlock_destroy_multithreaded (gl_rwlock_t *lock)
+{
+ int err;
+
+ err = pthread_mutex_destroy (&lock->lock);
+ if (err != 0)
+ return err;
+ err = pthread_cond_destroy (&lock->waiting_readers);
+ if (err != 0)
+ return err;
+ err = pthread_cond_destroy (&lock->waiting_writers);
+ if (err != 0)
+ return err;
+ return 0;
+}
+
+# endif
+
+/* --------------------- gl_recursive_lock_t datatype --------------------- */
+
+# if HAVE_PTHREAD_MUTEX_RECURSIVE
+
+# if defined PTHREAD_RECURSIVE_MUTEX_INITIALIZER || defined PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP
+
+int
+glthread_recursive_lock_init_multithreaded (gl_recursive_lock_t *lock)
+{
+ pthread_mutexattr_t attributes;
+ int err;
+
+ err = pthread_mutexattr_init (&attributes);
+ if (err != 0)
+ return err;
+ err = pthread_mutexattr_settype (&attributes, PTHREAD_MUTEX_RECURSIVE);
+ if (err != 0)
+ {
+ pthread_mutexattr_destroy (&attributes);
+ return err;
+ }
+ err = pthread_mutex_init (lock, &attributes);
+ if (err != 0)
+ {
+ pthread_mutexattr_destroy (&attributes);
+ return err;
+ }
+ err = pthread_mutexattr_destroy (&attributes);
+ if (err != 0)
+ return err;
+ return 0;
+}
+
+# else
+
+int
+glthread_recursive_lock_init_multithreaded (gl_recursive_lock_t *lock)
+{
+ pthread_mutexattr_t attributes;
+ int err;
+
+ err = pthread_mutexattr_init (&attributes);
+ if (err != 0)
+ return err;
+ err = pthread_mutexattr_settype (&attributes, PTHREAD_MUTEX_RECURSIVE);
+ if (err != 0)
+ {
+ pthread_mutexattr_destroy (&attributes);
+ return err;
+ }
+ err = pthread_mutex_init (&lock->recmutex, &attributes);
+ if (err != 0)
+ {
+ pthread_mutexattr_destroy (&attributes);
+ return err;
+ }
+ err = pthread_mutexattr_destroy (&attributes);
+ if (err != 0)
+ return err;
+ lock->initialized = 1;
+ return 0;
+}
+
+int
+glthread_recursive_lock_lock_multithreaded (gl_recursive_lock_t *lock)
+{
+ if (!lock->initialized)
+ {
+ int err;
+
+ err = pthread_mutex_lock (&lock->guard);
+ if (err != 0)
+ return err;
+ if (!lock->initialized)
+ {
+ err = glthread_recursive_lock_init_multithreaded (lock);
+ if (err != 0)
+ {
+ pthread_mutex_unlock (&lock->guard);
+ return err;
+ }
+ }
+ err = pthread_mutex_unlock (&lock->guard);
+ if (err != 0)
+ return err;
+ }
+ return pthread_mutex_lock (&lock->recmutex);
+}
+
+int
+glthread_recursive_lock_unlock_multithreaded (gl_recursive_lock_t *lock)
+{
+ if (!lock->initialized)
+ return EINVAL;
+ return pthread_mutex_unlock (&lock->recmutex);
+}
+
+int
+glthread_recursive_lock_destroy_multithreaded (gl_recursive_lock_t *lock)
+{
+ int err;
+
+ if (!lock->initialized)
+ return EINVAL;
+ err = pthread_mutex_destroy (&lock->recmutex);
+ if (err != 0)
+ return err;
+ lock->initialized = 0;
+ return 0;
+}
+
+# endif
+
+# else
+
+int
+glthread_recursive_lock_init_multithreaded (gl_recursive_lock_t *lock)
+{
+ int err;
+
+ err = pthread_mutex_init (&lock->mutex, NULL);
+ if (err != 0)
+ return err;
+ lock->owner = (pthread_t) 0;
+ lock->depth = 0;
+ return 0;
+}
+
+int
+glthread_recursive_lock_lock_multithreaded (gl_recursive_lock_t *lock)
+{
+ pthread_t self = pthread_self ();
+ if (lock->owner != self)
+ {
+ int err;
+
+ err = pthread_mutex_lock (&lock->mutex);
+ if (err != 0)
+ return err;
+ lock->owner = self;
+ }
+ if (++(lock->depth) == 0) /* wraparound? */
+ {
+ lock->depth--;
+ return EAGAIN;
+ }
+ return 0;
+}
+
+int
+glthread_recursive_lock_unlock_multithreaded (gl_recursive_lock_t *lock)
+{
+ if (lock->owner != pthread_self ())
+ return EPERM;
+ if (lock->depth == 0)
+ return EINVAL;
+ if (--(lock->depth) == 0)
+ {
+ lock->owner = (pthread_t) 0;
+ return pthread_mutex_unlock (&lock->mutex);
+ }
+ else
+ return 0;
+}
+
+int
+glthread_recursive_lock_destroy_multithreaded (gl_recursive_lock_t *lock)
+{
+ if (lock->owner != (pthread_t) 0)
+ return EBUSY;
+ return (pthread_mutex_destroy (&lock->mutex);
+}
+
+# endif
+
+/* -------------------------- gl_once_t datatype -------------------------- */
+
+static const pthread_once_t fresh_once = PTHREAD_ONCE_INIT;
+
+int
+glthread_once_singlethreaded (pthread_once_t *once_control)
+{
+ /* We don't know whether pthread_once_t is an integer type, a floating-point
+ type, a pointer type, or a structure type. */
+ char *firstbyte = (char *)once_control;
+ if (*firstbyte == *(const char *)&fresh_once)
+ {
+ /* First time use of once_control. Invert the first byte. */
+ *firstbyte = ~ *(const char *)&fresh_once;
+ return 1;
+ }
+ else
+ return 0;
+}
+
+#endif
+
+/* ========================================================================= */
+
+#if USE_PTH_THREADS
+
+/* Use the GNU Pth threads library. */
+
+/* -------------------------- gl_lock_t datatype -------------------------- */
+
+/* ------------------------- gl_rwlock_t datatype ------------------------- */
+
+/* --------------------- gl_recursive_lock_t datatype --------------------- */
+
+/* -------------------------- gl_once_t datatype -------------------------- */
+
+static void
+glthread_once_call (void *arg)
+{
+ void (**gl_once_temp_addr) (void) = (void (**) (void)) arg;
+ void (*initfunction) (void) = *gl_once_temp_addr;
+ initfunction ();
+}
+
+int
+glthread_once_multithreaded (pth_once_t *once_control, void (*initfunction) (void))
+{
+ void (*temp) (void) = initfunction;
+ return (!pth_once (once_control, glthread_once_call, &temp) ? errno : 0);
+}
+
+int
+glthread_once_singlethreaded (pth_once_t *once_control)
+{
+ /* We know that pth_once_t is an integer type. */
+ if (*once_control == PTH_ONCE_INIT)
+ {
+ /* First time use of once_control. Invert the marker. */
+ *once_control = ~ PTH_ONCE_INIT;
+ return 1;
+ }
+ else
+ return 0;
+}
+
+#endif
+
+/* ========================================================================= */
+
+#if USE_SOLARIS_THREADS
+
+/* Use the old Solaris threads library. */
+
+/* -------------------------- gl_lock_t datatype -------------------------- */
+
+/* ------------------------- gl_rwlock_t datatype ------------------------- */
+
+/* --------------------- gl_recursive_lock_t datatype --------------------- */
+
+int
+glthread_recursive_lock_init_multithreaded (gl_recursive_lock_t *lock)
+{
+ int err;
+
+ err = mutex_init (&lock->mutex, USYNC_THREAD, NULL);
+ if (err != 0)
+ return err;
+ lock->owner = (thread_t) 0;
+ lock->depth = 0;
+ return 0;
+}
+
+int
+glthread_recursive_lock_lock_multithreaded (gl_recursive_lock_t *lock)
+{
+ thread_t self = thr_self ();
+ if (lock->owner != self)
+ {
+ int err;
+
+ err = mutex_lock (&lock->mutex);
+ if (err != 0)
+ return err;
+ lock->owner = self;
+ }
+ if (++(lock->depth) == 0) /* wraparound? */
+ {
+ lock->depth--;
+ return EAGAIN;
+ }
+ return 0;
+}
+
+int
+glthread_recursive_lock_unlock_multithreaded (gl_recursive_lock_t *lock)
+{
+ if (lock->owner != thr_self ())
+ return EPERM;
+ if (lock->depth == 0)
+ return EINVAL;
+ if (--(lock->depth) == 0)
+ {
+ lock->owner = (thread_t) 0;
+ return mutex_unlock (&lock->mutex);
+ }
+ else
+ return 0;
+}
+
+int
+glthread_recursive_lock_destroy_multithreaded (gl_recursive_lock_t *lock)
+{
+ if (lock->owner != (thread_t) 0)
+ return EBUSY;
+ return mutex_destroy (&lock->mutex);
+}
+
+/* -------------------------- gl_once_t datatype -------------------------- */
+
+int
+glthread_once_multithreaded (gl_once_t *once_control, void (*initfunction) (void))
+{
+ if (!once_control->inited)
+ {
+ int err;
+
+ /* Use the mutex to guarantee that if another thread is already calling
+ the initfunction, this thread waits until it's finished. */
+ err = mutex_lock (&once_control->mutex);
+ if (err != 0)
+ return err;
+ if (!once_control->inited)
+ {
+ once_control->inited = 1;
+ initfunction ();
+ }
+ return mutex_unlock (&once_control->mutex);
+ }
+ else
+ return 0;
+}
+
+int
+glthread_once_singlethreaded (gl_once_t *once_control)
+{
+ /* We know that gl_once_t contains an integer type. */
+ if (!once_control->inited)
+ {
+ /* First time use of once_control. Invert the marker. */
+ once_control->inited = ~ 0;
+ return 1;
+ }
+ else
+ return 0;
+}
+
+#endif
+
+/* ========================================================================= */
+
+#if USE_WIN32_THREADS
+
+/* -------------------------- gl_lock_t datatype -------------------------- */
+
+void
+glthread_lock_init_func (gl_lock_t *lock)
+{
+ InitializeCriticalSection (&lock->lock);
+ lock->guard.done = 1;
+}
+
+int
+glthread_lock_lock (gl_lock_t *lock)
+{
+ if (!lock->guard.done)
+ {
+ if (InterlockedIncrement (&lock->guard.started) == 0)
+ /* This thread is the first one to need this lock. Initialize it. */
+ glthread_lock_init (lock);
+ else
+ /* Yield the CPU while waiting for another thread to finish
+ initializing this lock. */
+ while (!lock->guard.done)
+ Sleep (0);
+ }
+ EnterCriticalSection (&lock->lock);
+ return 0;
+}
+
+int
+glthread_lock_unlock (gl_lock_t *lock)
+{
+ if (!lock->guard.done)
+ return EINVAL;
+ LeaveCriticalSection (&lock->lock);
+ return 0;
+}
+
+int
+glthread_lock_destroy (gl_lock_t *lock)
+{
+ if (!lock->guard.done)
+ return EINVAL;
+ DeleteCriticalSection (&lock->lock);
+ lock->guard.done = 0;
+ return 0;
+}
+
+/* ------------------------- gl_rwlock_t datatype ------------------------- */
+
+static inline void
+gl_waitqueue_init (gl_waitqueue_t *wq)
+{
+ wq->array = NULL;
+ wq->count = 0;
+ wq->alloc = 0;
+ wq->offset = 0;
+}
+
+/* Enqueues the current thread, represented by an event, in a wait queue.
+ Returns INVALID_HANDLE_VALUE if an allocation failure occurs. */
+static HANDLE
+gl_waitqueue_add (gl_waitqueue_t *wq)
+{
+ HANDLE event;
+ unsigned int index;
+
+ if (wq->count == wq->alloc)
+ {
+ unsigned int new_alloc = 2 * wq->alloc + 1;
+ HANDLE *new_array =
+ (HANDLE *) realloc (wq->array, new_alloc * sizeof (HANDLE));
+ if (new_array == NULL)
+ /* No more memory. */
+ return INVALID_HANDLE_VALUE;
+ /* Now is a good opportunity to rotate the array so that its contents
+ starts at offset 0. */
+ if (wq->offset > 0)
+ {
+ unsigned int old_count = wq->count;
+ unsigned int old_alloc = wq->alloc;
+ unsigned int old_offset = wq->offset;
+ unsigned int i;
+ if (old_offset + old_count > old_alloc)
+ {
+ unsigned int limit = old_offset + old_count - old_alloc;
+ for (i = 0; i < limit; i++)
+ new_array[old_alloc + i] = new_array[i];
+ }
+ for (i = 0; i < old_count; i++)
+ new_array[i] = new_array[old_offset + i];
+ wq->offset = 0;
+ }
+ wq->array = new_array;
+ wq->alloc = new_alloc;
+ }
+ event = CreateEvent (NULL, TRUE, FALSE, NULL);
+ if (event == INVALID_HANDLE_VALUE)
+ /* No way to allocate an event. */
+ return INVALID_HANDLE_VALUE;
+ index = wq->offset + wq->count;
+ if (index >= wq->alloc)
+ index -= wq->alloc;
+ wq->array[index] = event;
+ wq->count++;
+ return event;
+}
+
+/* Notifies the first thread from a wait queue and dequeues it. */
+static inline void
+gl_waitqueue_notify_first (gl_waitqueue_t *wq)
+{
+ SetEvent (wq->array[wq->offset + 0]);
+ wq->offset++;
+ wq->count--;
+ if (wq->count == 0 || wq->offset == wq->alloc)
+ wq->offset = 0;
+}
+
+/* Notifies all threads from a wait queue and dequeues them all. */
+static inline void
+gl_waitqueue_notify_all (gl_waitqueue_t *wq)
+{
+ unsigned int i;
+
+ for (i = 0; i < wq->count; i++)
+ {
+ unsigned int index = wq->offset + i;
+ if (index >= wq->alloc)
+ index -= wq->alloc;
+ SetEvent (wq->array[index]);
+ }
+ wq->count = 0;
+ wq->offset = 0;
+}
+
+void
+glthread_rwlock_init_func (gl_rwlock_t *lock)
+{
+ InitializeCriticalSection (&lock->lock);
+ gl_waitqueue_init (&lock->waiting_readers);
+ gl_waitqueue_init (&lock->waiting_writers);
+ lock->runcount = 0;
+ lock->guard.done = 1;
+}
+
+int
+glthread_rwlock_rdlock (gl_rwlock_t *lock)
+{
+ if (!lock->guard.done)
+ {
+ if (InterlockedIncrement (&lock->guard.started) == 0)
+ /* This thread is the first one to need this lock. Initialize it. */
+ glthread_rwlock_init (lock);
+ else
+ /* Yield the CPU while waiting for another thread to finish
+ initializing this lock. */
+ while (!lock->guard.done)
+ Sleep (0);
+ }
+ EnterCriticalSection (&lock->lock);
+ /* Test whether only readers are currently running, and whether the runcount
+ field will not overflow. */
+ if (!(lock->runcount + 1 > 0))
+ {
+ /* This thread has to wait for a while. Enqueue it among the
+ waiting_readers. */
+ HANDLE event = gl_waitqueue_add (&lock->waiting_readers);
+ if (event != INVALID_HANDLE_VALUE)
+ {
+ DWORD result;
+ LeaveCriticalSection (&lock->lock);
+ /* Wait until another thread signals this event. */
+ result = WaitForSingleObject (event, INFINITE);
+ if (result == WAIT_FAILED || result == WAIT_TIMEOUT)
+ abort ();
+ CloseHandle (event);
+ /* The thread which signalled the event already did the bookkeeping:
+ removed us from the waiting_readers, incremented lock->runcount. */
+ if (!(lock->runcount > 0))
+ abort ();
+ return 0;
+ }
+ else
+ {
+ /* Allocation failure. Weird. */
+ do
+ {
+ LeaveCriticalSection (&lock->lock);
+ Sleep (1);
+ EnterCriticalSection (&lock->lock);
+ }
+ while (!(lock->runcount + 1 > 0));
+ }
+ }
+ lock->runcount++;
+ LeaveCriticalSection (&lock->lock);
+ return 0;
+}
+
+int
+glthread_rwlock_wrlock (gl_rwlock_t *lock)
+{
+ if (!lock->guard.done)
+ {
+ if (InterlockedIncrement (&lock->guard.started) == 0)
+ /* This thread is the first one to need this lock. Initialize it. */
+ glthread_rwlock_init (lock);
+ else
+ /* Yield the CPU while waiting for another thread to finish
+ initializing this lock. */
+ while (!lock->guard.done)
+ Sleep (0);
+ }
+ EnterCriticalSection (&lock->lock);
+ /* Test whether no readers or writers are currently running. */
+ if (!(lock->runcount == 0))
+ {
+ /* This thread has to wait for a while. Enqueue it among the
+ waiting_writers. */
+ HANDLE event = gl_waitqueue_add (&lock->waiting_writers);
+ if (event != INVALID_HANDLE_VALUE)
+ {
+ DWORD result;
+ LeaveCriticalSection (&lock->lock);
+ /* Wait until another thread signals this event. */
+ result = WaitForSingleObject (event, INFINITE);
+ if (result == WAIT_FAILED || result == WAIT_TIMEOUT)
+ abort ();
+ CloseHandle (event);
+ /* The thread which signalled the event already did the bookkeeping:
+ removed us from the waiting_writers, set lock->runcount = -1. */
+ if (!(lock->runcount == -1))
+ abort ();
+ return 0;
+ }
+ else
+ {
+ /* Allocation failure. Weird. */
+ do
+ {
+ LeaveCriticalSection (&lock->lock);
+ Sleep (1);
+ EnterCriticalSection (&lock->lock);
+ }
+ while (!(lock->runcount == 0));
+ }
+ }
+ lock->runcount--; /* runcount becomes -1 */
+ LeaveCriticalSection (&lock->lock);
+ return 0;
+}
+
+int
+glthread_rwlock_unlock (gl_rwlock_t *lock)
+{
+ if (!lock->guard.done)
+ return EINVAL;
+ EnterCriticalSection (&lock->lock);
+ if (lock->runcount < 0)
+ {
+ /* Drop a writer lock. */
+ if (!(lock->runcount == -1))
+ abort ();
+ lock->runcount = 0;
+ }
+ else
+ {
+ /* Drop a reader lock. */
+ if (!(lock->runcount > 0))
+ {
+ LeaveCriticalSection (&lock->lock);
+ return EPERM;
+ }
+ lock->runcount--;
+ }
+ if (lock->runcount == 0)
+ {
+ /* POSIX recommends that "write locks shall take precedence over read
+ locks", to avoid "writer starvation". */
+ if (lock->waiting_writers.count > 0)
+ {
+ /* Wake up one of the waiting writers. */
+ lock->runcount--;
+ gl_waitqueue_notify_first (&lock->waiting_writers);
+ }
+ else
+ {
+ /* Wake up all waiting readers. */
+ lock->runcount += lock->waiting_readers.count;
+ gl_waitqueue_notify_all (&lock->waiting_readers);
+ }
+ }
+ LeaveCriticalSection (&lock->lock);
+ return 0;
+}
+
+int
+glthread_rwlock_destroy (gl_rwlock_t *lock)
+{
+ if (!lock->guard.done)
+ return EINVAL;
+ if (lock->runcount != 0)
+ return EBUSY;
+ DeleteCriticalSection (&lock->lock);
+ if (lock->waiting_readers.array != NULL)
+ free (lock->waiting_readers.array);
+ if (lock->waiting_writers.array != NULL)
+ free (lock->waiting_writers.array);
+ lock->guard.done = 0;
+ return 0;
+}
+
+/* --------------------- gl_recursive_lock_t datatype --------------------- */
+
+void
+glthread_recursive_lock_init_func (gl_recursive_lock_t *lock)
+{
+ lock->owner = 0;
+ lock->depth = 0;
+ InitializeCriticalSection (&lock->lock);
+ lock->guard.done = 1;
+}
+
+int
+glthread_recursive_lock_lock (gl_recursive_lock_t *lock)
+{
+ if (!lock->guard.done)
+ {
+ if (InterlockedIncrement (&lock->guard.started) == 0)
+ /* This thread is the first one to need this lock. Initialize it. */
+ glthread_recursive_lock_init (lock);
+ else
+ /* Yield the CPU while waiting for another thread to finish
+ initializing this lock. */
+ while (!lock->guard.done)
+ Sleep (0);
+ }
+ {
+ DWORD self = GetCurrentThreadId ();
+ if (lock->owner != self)
+ {
+ EnterCriticalSection (&lock->lock);
+ lock->owner = self;
+ }
+ if (++(lock->depth) == 0) /* wraparound? */
+ {
+ lock->depth--;
+ return EAGAIN;
+ }
+ }
+ return 0;
+}
+
+int
+glthread_recursive_lock_unlock (gl_recursive_lock_t *lock)
+{
+ if (lock->owner != GetCurrentThreadId ())
+ return EPERM;
+ if (lock->depth == 0)
+ return EINVAL;
+ if (--(lock->depth) == 0)
+ {
+ lock->owner = 0;
+ LeaveCriticalSection (&lock->lock);
+ }
+ return 0;
+}
+
+int
+glthread_recursive_lock_destroy (gl_recursive_lock_t *lock)
+{
+ if (lock->owner != 0)
+ return EBUSY;
+ DeleteCriticalSection (&lock->lock);
+ lock->guard.done = 0;
+ return 0;
+}
+
+/* -------------------------- gl_once_t datatype -------------------------- */
+
+void
+glthread_once_func (gl_once_t *once_control, void (*initfunction) (void))
+{
+ if (once_control->inited <= 0)
+ {
+ if (InterlockedIncrement (&once_control->started) == 0)
+ {
+ /* This thread is the first one to come to this once_control. */
+ InitializeCriticalSection (&once_control->lock);
+ EnterCriticalSection (&once_control->lock);
+ once_control->inited = 0;
+ initfunction ();
+ once_control->inited = 1;
+ LeaveCriticalSection (&once_control->lock);
+ }
+ else
+ {
+ /* Undo last operation. */
+ InterlockedDecrement (&once_control->started);
+ /* Some other thread has already started the initialization.
+ Yield the CPU while waiting for the other thread to finish
+ initializing and taking the lock. */
+ while (once_control->inited < 0)
+ Sleep (0);
+ if (once_control->inited <= 0)
+ {
+ /* Take the lock. This blocks until the other thread has
+ finished calling the initfunction. */
+ EnterCriticalSection (&once_control->lock);
+ LeaveCriticalSection (&once_control->lock);
+ if (!(once_control->inited > 0))
+ abort ();
+ }
+ }
+ }
+}
+
+#endif
+
+/* ========================================================================= */
--- /dev/null
+/* Locking in multithreaded situations.
+ Copyright (C) 2005-2008 Free Software Foundation, Inc.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2, or (at your option)
+ any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software Foundation,
+ Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
+
+/* Written by Bruno Haible <bruno@clisp.org>, 2005.
+ Based on GCC's gthr-posix.h, gthr-posix95.h, gthr-solaris.h,
+ gthr-win32.h. */
+
+/* This file contains locking primitives for use with a given thread library.
+ It does not contain primitives for creating threads or for other
+ synchronization primitives.
+
+ Normal (non-recursive) locks:
+ Type: gl_lock_t
+ Declaration: gl_lock_define(extern, name)
+ Initializer: gl_lock_define_initialized(, name)
+ Initialization: gl_lock_init (name);
+ Taking the lock: gl_lock_lock (name);
+ Releasing the lock: gl_lock_unlock (name);
+ De-initialization: gl_lock_destroy (name);
+ Equivalent functions with control of error handling:
+ Initialization: err = glthread_lock_init (&name);
+ Taking the lock: err = glthread_lock_lock (&name);
+ Releasing the lock: err = glthread_lock_unlock (&name);
+ De-initialization: err = glthread_lock_destroy (&name);
+
+ Read-Write (non-recursive) locks:
+ Type: gl_rwlock_t
+ Declaration: gl_rwlock_define(extern, name)
+ Initializer: gl_rwlock_define_initialized(, name)
+ Initialization: gl_rwlock_init (name);
+ Taking the lock: gl_rwlock_rdlock (name);
+ gl_rwlock_wrlock (name);
+ Releasing the lock: gl_rwlock_unlock (name);
+ De-initialization: gl_rwlock_destroy (name);
+ Equivalent functions with control of error handling:
+ Initialization: err = glthread_rwlock_init (&name);
+ Taking the lock: err = glthread_rwlock_rdlock (&name);
+ err = glthread_rwlock_wrlock (&name);
+ Releasing the lock: err = glthread_rwlock_unlock (&name);
+ De-initialization: err = glthread_rwlock_destroy (&name);
+
+ Recursive locks:
+ Type: gl_recursive_lock_t
+ Declaration: gl_recursive_lock_define(extern, name)
+ Initializer: gl_recursive_lock_define_initialized(, name)
+ Initialization: gl_recursive_lock_init (name);
+ Taking the lock: gl_recursive_lock_lock (name);
+ Releasing the lock: gl_recursive_lock_unlock (name);
+ De-initialization: gl_recursive_lock_destroy (name);
+ Equivalent functions with control of error handling:
+ Initialization: err = glthread_recursive_lock_init (&name);
+ Taking the lock: err = glthread_recursive_lock_lock (&name);
+ Releasing the lock: err = glthread_recursive_lock_unlock (&name);
+ De-initialization: err = glthread_recursive_lock_destroy (&name);
+
+ Once-only execution:
+ Type: gl_once_t
+ Initializer: gl_once_define(extern, name)
+ Execution: gl_once (name, initfunction);
+ Equivalent functions with control of error handling:
+ Execution: err = glthread_once (&name, initfunction);
+*/
+
+
+#ifndef _LOCK_H
+#define _LOCK_H
+
+#include <errno.h>
+
+/* ========================================================================= */
+
+#if USE_POSIX_THREADS
+
+/* Use the POSIX threads library. */
+
+# include <pthread.h>
+# include <stdlib.h>
+
+# ifdef __cplusplus
+extern "C" {
+# endif
+
+# if PTHREAD_IN_USE_DETECTION_HARD
+
+/* The pthread_in_use() detection needs to be done at runtime. */
+# define pthread_in_use() \
+ glthread_in_use ()
+extern int glthread_in_use (void);
+
+# endif
+
+# if USE_POSIX_THREADS_WEAK
+
+/* Use weak references to the POSIX threads library. */
+
+/* Weak references avoid dragging in external libraries if the other parts
+ of the program don't use them. Here we use them, because we don't want
+ every program that uses libintl to depend on libpthread. This assumes
+ that libpthread would not be loaded after libintl; i.e. if libintl is
+ loaded first, by an executable that does not depend on libpthread, and
+ then a module is dynamically loaded that depends on libpthread, libintl
+ will not be multithread-safe. */
+
+/* The way to test at runtime whether libpthread is present is to test
+ whether a function pointer's value, such as &pthread_mutex_init, is
+ non-NULL. However, some versions of GCC have a bug through which, in
+ PIC mode, &foo != NULL always evaluates to true if there is a direct
+ call to foo(...) in the same function. To avoid this, we test the
+ address of a function in libpthread that we don't use. */
+
+# pragma weak pthread_mutex_init
+# pragma weak pthread_mutex_lock
+# pragma weak pthread_mutex_unlock
+# pragma weak pthread_mutex_destroy
+# pragma weak pthread_rwlock_init
+# pragma weak pthread_rwlock_rdlock
+# pragma weak pthread_rwlock_wrlock
+# pragma weak pthread_rwlock_unlock
+# pragma weak pthread_rwlock_destroy
+# pragma weak pthread_once
+# pragma weak pthread_cond_init
+# pragma weak pthread_cond_wait
+# pragma weak pthread_cond_signal
+# pragma weak pthread_cond_broadcast
+# pragma weak pthread_cond_destroy
+# pragma weak pthread_mutexattr_init
+# pragma weak pthread_mutexattr_settype
+# pragma weak pthread_mutexattr_destroy
+# ifndef pthread_self
+# pragma weak pthread_self
+# endif
+
+# if !PTHREAD_IN_USE_DETECTION_HARD
+# pragma weak pthread_cancel
+# define pthread_in_use() (pthread_cancel != NULL)
+# endif
+
+# else
+
+# if !PTHREAD_IN_USE_DETECTION_HARD
+# define pthread_in_use() 1
+# endif
+
+# endif
+
+/* -------------------------- gl_lock_t datatype -------------------------- */
+
+typedef pthread_mutex_t gl_lock_t;
+# define gl_lock_define(STORAGECLASS, NAME) \
+ STORAGECLASS pthread_mutex_t NAME;
+# define gl_lock_define_initialized(STORAGECLASS, NAME) \
+ STORAGECLASS pthread_mutex_t NAME = gl_lock_initializer;
+# define gl_lock_initializer \
+ PTHREAD_MUTEX_INITIALIZER
+# define glthread_lock_init(LOCK) \
+ (pthread_in_use () ? pthread_mutex_init (LOCK, NULL) : 0)
+# define glthread_lock_lock(LOCK) \
+ (pthread_in_use () ? pthread_mutex_lock (LOCK) : 0)
+# define glthread_lock_unlock(LOCK) \
+ (pthread_in_use () ? pthread_mutex_unlock (LOCK) : 0)
+# define glthread_lock_destroy(LOCK) \
+ (pthread_in_use () ? pthread_mutex_destroy (LOCK) : 0)
+
+/* ------------------------- gl_rwlock_t datatype ------------------------- */
+
+# if HAVE_PTHREAD_RWLOCK
+
+# ifdef PTHREAD_RWLOCK_INITIALIZER
+
+typedef pthread_rwlock_t gl_rwlock_t;
+# define gl_rwlock_define(STORAGECLASS, NAME) \
+ STORAGECLASS pthread_rwlock_t NAME;
+# define gl_rwlock_define_initialized(STORAGECLASS, NAME) \
+ STORAGECLASS pthread_rwlock_t NAME = gl_rwlock_initializer;
+# define gl_rwlock_initializer \
+ PTHREAD_RWLOCK_INITIALIZER
+# define glthread_rwlock_init(LOCK) \
+ (pthread_in_use () ? pthread_rwlock_init (LOCK, NULL) : 0)
+# define glthread_rwlock_rdlock(LOCK) \
+ (pthread_in_use () ? pthread_rwlock_rdlock (LOCK) : 0)
+# define glthread_rwlock_wrlock(LOCK) \
+ (pthread_in_use () ? pthread_rwlock_wrlock (LOCK) : 0)
+# define glthread_rwlock_unlock(LOCK) \
+ (pthread_in_use () ? pthread_rwlock_unlock (LOCK) : 0)
+# define glthread_rwlock_destroy(LOCK) \
+ (pthread_in_use () ? pthread_rwlock_destroy (LOCK) : 0)
+
+# else
+
+typedef struct
+ {
+ int initialized;
+ pthread_mutex_t guard; /* protects the initialization */
+ pthread_rwlock_t rwlock; /* read-write lock */
+ }
+ gl_rwlock_t;
+# define gl_rwlock_define(STORAGECLASS, NAME) \
+ STORAGECLASS gl_rwlock_t NAME;
+# define gl_rwlock_define_initialized(STORAGECLASS, NAME) \
+ STORAGECLASS gl_rwlock_t NAME = gl_rwlock_initializer;
+# define gl_rwlock_initializer \
+ { 0, PTHREAD_MUTEX_INITIALIZER }
+# define glthread_rwlock_init(LOCK) \
+ (pthread_in_use () ? glthread_rwlock_init_multithreaded (LOCK) : 0)
+# define glthread_rwlock_rdlock(LOCK) \
+ (pthread_in_use () ? glthread_rwlock_rdlock_multithreaded (LOCK) : 0)
+# define glthread_rwlock_wrlock(LOCK) \
+ (pthread_in_use () ? glthread_rwlock_wrlock_multithreaded (LOCK) : 0)
+# define glthread_rwlock_unlock(LOCK) \
+ (pthread_in_use () ? glthread_rwlock_unlock_multithreaded (LOCK) : 0)
+# define glthread_rwlock_destroy(LOCK) \
+ (pthread_in_use () ? glthread_rwlock_destroy_multithreaded (LOCK) : 0)
+extern int glthread_rwlock_init_multithreaded (gl_rwlock_t *lock);
+extern int glthread_rwlock_rdlock_multithreaded (gl_rwlock_t *lock);
+extern int glthread_rwlock_wrlock_multithreaded (gl_rwlock_t *lock);
+extern int glthread_rwlock_unlock_multithreaded (gl_rwlock_t *lock);
+extern int glthread_rwlock_destroy_multithreaded (gl_rwlock_t *lock);
+
+# endif
+
+# else
+
+typedef struct
+ {
+ pthread_mutex_t lock; /* protects the remaining fields */
+ pthread_cond_t waiting_readers; /* waiting readers */
+ pthread_cond_t waiting_writers; /* waiting writers */
+ unsigned int waiting_writers_count; /* number of waiting writers */
+ int runcount; /* number of readers running, or -1 when a writer runs */
+ }
+ gl_rwlock_t;
+# define gl_rwlock_define(STORAGECLASS, NAME) \
+ STORAGECLASS gl_rwlock_t NAME;
+# define gl_rwlock_define_initialized(STORAGECLASS, NAME) \
+ STORAGECLASS gl_rwlock_t NAME = gl_rwlock_initializer;
+# define gl_rwlock_initializer \
+ { PTHREAD_MUTEX_INITIALIZER, PTHREAD_COND_INITIALIZER, PTHREAD_COND_INITIALIZER, 0, 0 }
+# define glthread_rwlock_init(LOCK) \
+ (pthread_in_use () ? glthread_rwlock_init_multithreaded (LOCK) : 0)
+# define glthread_rwlock_rdlock(LOCK) \
+ (pthread_in_use () ? glthread_rwlock_rdlock_multithreaded (LOCK) : 0)
+# define glthread_rwlock_wrlock(LOCK) \
+ (pthread_in_use () ? glthread_rwlock_wrlock_multithreaded (LOCK) : 0)
+# define glthread_rwlock_unlock(LOCK) \
+ (pthread_in_use () ? glthread_rwlock_unlock_multithreaded (LOCK) : 0)
+# define glthread_rwlock_destroy(LOCK) \
+ (pthread_in_use () ? glthread_rwlock_destroy_multithreaded (LOCK) : 0)
+extern int glthread_rwlock_init_multithreaded (gl_rwlock_t *lock);
+extern int glthread_rwlock_rdlock_multithreaded (gl_rwlock_t *lock);
+extern int glthread_rwlock_wrlock_multithreaded (gl_rwlock_t *lock);
+extern int glthread_rwlock_unlock_multithreaded (gl_rwlock_t *lock);
+extern int glthread_rwlock_destroy_multithreaded (gl_rwlock_t *lock);
+
+# endif
+
+/* --------------------- gl_recursive_lock_t datatype --------------------- */
+
+# if HAVE_PTHREAD_MUTEX_RECURSIVE
+
+# if defined PTHREAD_RECURSIVE_MUTEX_INITIALIZER || defined PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP
+
+typedef pthread_mutex_t gl_recursive_lock_t;
+# define gl_recursive_lock_define(STORAGECLASS, NAME) \
+ STORAGECLASS pthread_mutex_t NAME;
+# define gl_recursive_lock_define_initialized(STORAGECLASS, NAME) \
+ STORAGECLASS pthread_mutex_t NAME = gl_recursive_lock_initializer;
+# ifdef PTHREAD_RECURSIVE_MUTEX_INITIALIZER
+# define gl_recursive_lock_initializer \
+ PTHREAD_RECURSIVE_MUTEX_INITIALIZER
+# else
+# define gl_recursive_lock_initializer \
+ PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP
+# endif
+# define glthread_recursive_lock_init(LOCK) \
+ (pthread_in_use () ? glthread_recursive_lock_init_multithreaded (LOCK) : 0)
+# define glthread_recursive_lock_lock(LOCK) \
+ (pthread_in_use () ? pthread_mutex_lock (LOCK) : 0)
+# define glthread_recursive_lock_unlock(LOCK) \
+ (pthread_in_use () ? pthread_mutex_unlock (LOCK) : 0)
+# define glthread_recursive_lock_destroy(LOCK) \
+ (pthread_in_use () ? pthread_mutex_destroy (LOCK) : 0)
+extern int glthread_recursive_lock_init_multithreaded (gl_recursive_lock_t *lock);
+
+# else
+
+typedef struct
+ {
+ pthread_mutex_t recmutex; /* recursive mutex */
+ pthread_mutex_t guard; /* protects the initialization */
+ int initialized;
+ }
+ gl_recursive_lock_t;
+# define gl_recursive_lock_define(STORAGECLASS, NAME) \
+ STORAGECLASS gl_recursive_lock_t NAME;
+# define gl_recursive_lock_define_initialized(STORAGECLASS, NAME) \
+ STORAGECLASS gl_recursive_lock_t NAME = gl_recursive_lock_initializer;
+# define gl_recursive_lock_initializer \
+ { PTHREAD_MUTEX_INITIALIZER, PTHREAD_MUTEX_INITIALIZER, 0 }
+# define glthread_recursive_lock_init(LOCK) \
+ (pthread_in_use () ? glthread_recursive_lock_init_multithreaded (LOCK) : 0)
+# define glthread_recursive_lock_lock(LOCK) \
+ (pthread_in_use () ? glthread_recursive_lock_lock_multithreaded (LOCK) : 0)
+# define glthread_recursive_lock_unlock(LOCK) \
+ (pthread_in_use () ? glthread_recursive_lock_unlock_multithreaded (LOCK) : 0)
+# define glthread_recursive_lock_destroy(LOCK) \
+ (pthread_in_use () ? glthread_recursive_lock_destroy_multithreaded (LOCK) : 0)
+extern int glthread_recursive_lock_init_multithreaded (gl_recursive_lock_t *lock);
+extern int glthread_recursive_lock_lock_multithreaded (gl_recursive_lock_t *lock);
+extern int glthread_recursive_lock_unlock_multithreaded (gl_recursive_lock_t *lock);
+extern int glthread_recursive_lock_destroy_multithreaded (gl_recursive_lock_t *lock);
+
+# endif
+
+# else
+
+/* Old versions of POSIX threads on Solaris did not have recursive locks.
+ We have to implement them ourselves. */
+
+typedef struct
+ {
+ pthread_mutex_t mutex;
+ pthread_t owner;
+ unsigned long depth;
+ }
+ gl_recursive_lock_t;
+# define gl_recursive_lock_define(STORAGECLASS, NAME) \
+ STORAGECLASS gl_recursive_lock_t NAME;
+# define gl_recursive_lock_define_initialized(STORAGECLASS, NAME) \
+ STORAGECLASS gl_recursive_lock_t NAME = gl_recursive_lock_initializer;
+# define gl_recursive_lock_initializer \
+ { PTHREAD_MUTEX_INITIALIZER, (pthread_t) 0, 0 }
+# define glthread_recursive_lock_init(LOCK) \
+ (pthread_in_use () ? glthread_recursive_lock_init_multithreaded (LOCK) : 0)
+# define glthread_recursive_lock_lock(LOCK) \
+ (pthread_in_use () ? glthread_recursive_lock_lock_multithreaded (LOCK) : 0)
+# define glthread_recursive_lock_unlock(LOCK) \
+ (pthread_in_use () ? glthread_recursive_lock_unlock_multithreaded (LOCK) : 0)
+# define glthread_recursive_lock_destroy(LOCK) \
+ (pthread_in_use () ? glthread_recursive_lock_destroy_multithreaded (LOCK) : 0)
+extern int glthread_recursive_lock_init_multithreaded (gl_recursive_lock_t *lock);
+extern int glthread_recursive_lock_lock_multithreaded (gl_recursive_lock_t *lock);
+extern int glthread_recursive_lock_unlock_multithreaded (gl_recursive_lock_t *lock);
+extern int glthread_recursive_lock_destroy_multithreaded (gl_recursive_lock_t *lock);
+
+# endif
+
+/* -------------------------- gl_once_t datatype -------------------------- */
+
+typedef pthread_once_t gl_once_t;
+# define gl_once_define(STORAGECLASS, NAME) \
+ STORAGECLASS pthread_once_t NAME = PTHREAD_ONCE_INIT;
+# define glthread_once(ONCE_CONTROL, INITFUNCTION) \
+ (pthread_in_use () \
+ ? pthread_once (ONCE_CONTROL, INITFUNCTION) \
+ : (glthread_once_singlethreaded (ONCE_CONTROL) ? (INITFUNCTION (), 0) : 0))
+extern int glthread_once_singlethreaded (pthread_once_t *once_control);
+
+# ifdef __cplusplus
+}
+# endif
+
+#endif
+
+/* ========================================================================= */
+
+#if USE_PTH_THREADS
+
+/* Use the GNU Pth threads library. */
+
+# include <pth.h>
+# include <stdlib.h>
+
+# ifdef __cplusplus
+extern "C" {
+# endif
+
+# if USE_PTH_THREADS_WEAK
+
+/* Use weak references to the GNU Pth threads library. */
+
+# pragma weak pth_mutex_init
+# pragma weak pth_mutex_acquire
+# pragma weak pth_mutex_release
+# pragma weak pth_rwlock_init
+# pragma weak pth_rwlock_acquire
+# pragma weak pth_rwlock_release
+# pragma weak pth_once
+
+# pragma weak pth_cancel
+# define pth_in_use() (pth_cancel != NULL)
+
+# else
+
+# define pth_in_use() 1
+
+# endif
+
+/* -------------------------- gl_lock_t datatype -------------------------- */
+
+typedef pth_mutex_t gl_lock_t;
+# define gl_lock_define(STORAGECLASS, NAME) \
+ STORAGECLASS pth_mutex_t NAME;
+# define gl_lock_define_initialized(STORAGECLASS, NAME) \
+ STORAGECLASS pth_mutex_t NAME = gl_lock_initializer;
+# define gl_lock_initializer \
+ PTH_MUTEX_INIT
+# define glthread_lock_init(LOCK) \
+ (pth_in_use() && !pth_mutex_init (LOCK) ? errno : 0)
+# define glthread_lock_lock(LOCK) \
+ (pth_in_use() && !pth_mutex_acquire (LOCK, 0, NULL) ? errno : 0)
+# define glthread_lock_unlock(LOCK) \
+ (pth_in_use() && !pth_mutex_release (LOCK) ? errno : 0)
+# define glthread_lock_destroy(LOCK) \
+ ((void)(LOCK), 0)
+
+/* ------------------------- gl_rwlock_t datatype ------------------------- */
+
+typedef pth_rwlock_t gl_rwlock_t;
+# define gl_rwlock_define(STORAGECLASS, NAME) \
+ STORAGECLASS pth_rwlock_t NAME;
+# define gl_rwlock_define_initialized(STORAGECLASS, NAME) \
+ STORAGECLASS pth_rwlock_t NAME = gl_rwlock_initializer;
+# define gl_rwlock_initializer \
+ PTH_RWLOCK_INIT
+# define glthread_rwlock_init(LOCK) \
+ (pth_in_use() && !pth_rwlock_init (LOCK) ? errno : 0)
+# define glthread_rwlock_rdlock(LOCK) \
+ (pth_in_use() && !pth_rwlock_acquire (LOCK, PTH_RWLOCK_RD, 0, NULL) ? errno : 0)
+# define glthread_rwlock_wrlock(LOCK) \
+ (pth_in_use() && !pth_rwlock_acquire (LOCK, PTH_RWLOCK_RW, 0, NULL) ? errno : 0)
+# define glthread_rwlock_unlock(LOCK) \
+ (pth_in_use() && !pth_rwlock_release (LOCK) ? errno : 0)
+# define glthread_rwlock_destroy(LOCK) \
+ ((void)(LOCK), 0)
+
+/* --------------------- gl_recursive_lock_t datatype --------------------- */
+
+/* In Pth, mutexes are recursive by default. */
+typedef pth_mutex_t gl_recursive_lock_t;
+# define gl_recursive_lock_define(STORAGECLASS, NAME) \
+ STORAGECLASS pth_mutex_t NAME;
+# define gl_recursive_lock_define_initialized(STORAGECLASS, NAME) \
+ STORAGECLASS pth_mutex_t NAME = gl_recursive_lock_initializer;
+# define gl_recursive_lock_initializer \
+ PTH_MUTEX_INIT
+# define glthread_recursive_lock_init(LOCK) \
+ (pth_in_use() && !pth_mutex_init (LOCK) ? errno : 0)
+# define glthread_recursive_lock_lock(LOCK) \
+ (pth_in_use() && !pth_mutex_acquire (LOCK, 0, NULL) ? errno : 0)
+# define glthread_recursive_lock_unlock(LOCK) \
+ (pth_in_use() && !pth_mutex_release (LOCK) ? errno : 0)
+# define glthread_recursive_lock_destroy(LOCK) \
+ ((void)(LOCK), 0)
+
+/* -------------------------- gl_once_t datatype -------------------------- */
+
+typedef pth_once_t gl_once_t;
+# define gl_once_define(STORAGECLASS, NAME) \
+ STORAGECLASS pth_once_t NAME = PTH_ONCE_INIT;
+# define glthread_once(ONCE_CONTROL, INITFUNCTION) \
+ (pth_in_use () \
+ ? glthread_once_multithreaded (ONCE_CONTROL, INITFUNCTION) \
+ : (glthread_once_singlethreaded (ONCE_CONTROL) ? (INITFUNCTION (), 0) : 0))
+extern int glthread_once_multithreaded (pth_once_t *once_control, void (*initfunction) (void));
+extern int glthread_once_singlethreaded (pth_once_t *once_control);
+
+# ifdef __cplusplus
+}
+# endif
+
+#endif
+
+/* ========================================================================= */
+
+#if USE_SOLARIS_THREADS
+
+/* Use the old Solaris threads library. */
+
+# include <thread.h>
+# include <synch.h>
+# include <stdlib.h>
+
+# ifdef __cplusplus
+extern "C" {
+# endif
+
+# if USE_SOLARIS_THREADS_WEAK
+
+/* Use weak references to the old Solaris threads library. */
+
+# pragma weak mutex_init
+# pragma weak mutex_lock
+# pragma weak mutex_unlock
+# pragma weak mutex_destroy
+# pragma weak rwlock_init
+# pragma weak rw_rdlock
+# pragma weak rw_wrlock
+# pragma weak rw_unlock
+# pragma weak rwlock_destroy
+# pragma weak thr_self
+
+# pragma weak thr_suspend
+# define thread_in_use() (thr_suspend != NULL)
+
+# else
+
+# define thread_in_use() 1
+
+# endif
+
+/* -------------------------- gl_lock_t datatype -------------------------- */
+
+typedef mutex_t gl_lock_t;
+# define gl_lock_define(STORAGECLASS, NAME) \
+ STORAGECLASS mutex_t NAME;
+# define gl_lock_define_initialized(STORAGECLASS, NAME) \
+ STORAGECLASS mutex_t NAME = gl_lock_initializer;
+# define gl_lock_initializer \
+ DEFAULTMUTEX
+# define glthread_lock_init(LOCK) \
+ (thread_in_use () ? mutex_init (LOCK, USYNC_THREAD, NULL) : 0)
+# define glthread_lock_lock(LOCK) \
+ (thread_in_use () ? mutex_lock (LOCK) : 0)
+# define glthread_lock_unlock(LOCK) \
+ (thread_in_use () ? mutex_unlock (LOCK) : 0)
+# define glthread_lock_destroy(LOCK) \
+ (thread_in_use () ? mutex_destroy (LOCK) : 0)
+
+/* ------------------------- gl_rwlock_t datatype ------------------------- */
+
+typedef rwlock_t gl_rwlock_t;
+# define gl_rwlock_define(STORAGECLASS, NAME) \
+ STORAGECLASS rwlock_t NAME;
+# define gl_rwlock_define_initialized(STORAGECLASS, NAME) \
+ STORAGECLASS rwlock_t NAME = gl_rwlock_initializer;
+# define gl_rwlock_initializer \
+ DEFAULTRWLOCK
+# define glthread_rwlock_init(LOCK) \
+ (thread_in_use () ? rwlock_init (LOCK, USYNC_THREAD, NULL) : 0)
+# define glthread_rwlock_rdlock(LOCK) \
+ (thread_in_use () ? rw_rdlock (LOCK) : 0)
+# define glthread_rwlock_wrlock(LOCK) \
+ (thread_in_use () ? rw_wrlock (LOCK) : 0)
+# define glthread_rwlock_unlock(LOCK) \
+ (thread_in_use () ? rw_unlock (LOCK) : 0)
+# define glthread_rwlock_destroy(LOCK) \
+ (thread_in_use () ? rwlock_destroy (LOCK) : 0)
+
+/* --------------------- gl_recursive_lock_t datatype --------------------- */
+
+/* Old Solaris threads did not have recursive locks.
+ We have to implement them ourselves. */
+
+typedef struct
+ {
+ mutex_t mutex;
+ thread_t owner;
+ unsigned long depth;
+ }
+ gl_recursive_lock_t;
+# define gl_recursive_lock_define(STORAGECLASS, NAME) \
+ STORAGECLASS gl_recursive_lock_t NAME;
+# define gl_recursive_lock_define_initialized(STORAGECLASS, NAME) \
+ STORAGECLASS gl_recursive_lock_t NAME = gl_recursive_lock_initializer;
+# define gl_recursive_lock_initializer \
+ { DEFAULTMUTEX, (thread_t) 0, 0 }
+# define glthread_recursive_lock_init(LOCK) \
+ do \
+ { \
+ if (thread_in_use ()) \
+ glthread_recursive_lock_init_multithreaded (LOCK); \
+ } \
+ while (0)
+# define glthread_recursive_lock_lock(LOCK) \
+ do \
+ { \
+ if (thread_in_use ()) \
+ glthread_recursive_lock_lock_multithreaded (LOCK); \
+ } \
+ while (0)
+# define glthread_recursive_lock_unlock(LOCK) \
+ do \
+ { \
+ if (thread_in_use ()) \
+ glthread_recursive_lock_unlock_multithreaded (LOCK); \
+ } \
+ while (0)
+# define glthread_recursive_lock_destroy(LOCK) \
+ do \
+ { \
+ if (thread_in_use ()) \
+ glthread_recursive_lock_destroy_multithreaded (LOCK); \
+ } \
+ while (0)
+extern int glthread_recursive_lock_init_multithreaded (gl_recursive_lock_t *lock);
+extern int glthread_recursive_lock_lock_multithreaded (gl_recursive_lock_t *lock);
+extern int glthread_recursive_lock_unlock_multithreaded (gl_recursive_lock_t *lock);
+extern int glthread_recursive_lock_destroy_multithreaded (gl_recursive_lock_t *lock);
+
+/* -------------------------- gl_once_t datatype -------------------------- */
+
+typedef struct
+ {
+ volatile int inited;
+ mutex_t mutex;
+ }
+ gl_once_t;
+# define gl_once_define(STORAGECLASS, NAME) \
+ STORAGECLASS gl_once_t NAME = { 0, DEFAULTMUTEX };
+# define glthread_once(ONCE_CONTROL, INITFUNCTION) \
+ (thread_in_use () \
+ ? glthread_once_multithreaded (ONCE_CONTROL, INITFUNCTION) \
+ : (glthread_once_singlethreaded (ONCE_CONTROL) ? (INITFUNCTION (), 0) : 0))
+extern int glthread_once_multithreaded (gl_once_t *once_control, void (*initfunction) (void));
+extern int glthread_once_singlethreaded (gl_once_t *once_control);
+
+# ifdef __cplusplus
+}
+# endif
+
+#endif
+
+/* ========================================================================= */
+
+#if USE_WIN32_THREADS
+
+# include <windows.h>
+
+# ifdef __cplusplus
+extern "C" {
+# endif
+
+/* We can use CRITICAL_SECTION directly, rather than the Win32 Event, Mutex,
+ Semaphore types, because
+ - we need only to synchronize inside a single process (address space),
+ not inter-process locking,
+ - we don't need to support trylock operations. (TryEnterCriticalSection
+ does not work on Windows 95/98/ME. Packages that need trylock usually
+ define their own mutex type.) */
+
+/* There is no way to statically initialize a CRITICAL_SECTION. It needs
+ to be done lazily, once only. For this we need spinlocks. */
+
+typedef struct { volatile int done; volatile long started; } gl_spinlock_t;
+
+/* -------------------------- gl_lock_t datatype -------------------------- */
+
+typedef struct
+ {
+ gl_spinlock_t guard; /* protects the initialization */
+ CRITICAL_SECTION lock;
+ }
+ gl_lock_t;
+# define gl_lock_define(STORAGECLASS, NAME) \
+ STORAGECLASS gl_lock_t NAME;
+# define gl_lock_define_initialized(STORAGECLASS, NAME) \
+ STORAGECLASS gl_lock_t NAME = gl_lock_initializer;
+# define gl_lock_initializer \
+ { { 0, -1 } }
+# define glthread_lock_init(LOCK) \
+ (glthread_lock_init_func (LOCK), 0)
+extern void glthread_lock_init_func (gl_lock_t *lock);
+extern int glthread_lock_lock (gl_lock_t *lock);
+extern int glthread_lock_unlock (gl_lock_t *lock);
+extern int glthread_lock_destroy (gl_lock_t *lock);
+
+/* ------------------------- gl_rwlock_t datatype ------------------------- */
+
+/* It is impossible to implement read-write locks using plain locks, without
+ introducing an extra thread dedicated to managing read-write locks.
+ Therefore here we need to use the low-level Event type. */
+
+typedef struct
+ {
+ HANDLE *array; /* array of waiting threads, each represented by an event */
+ unsigned int count; /* number of waiting threads */
+ unsigned int alloc; /* length of allocated array */
+ unsigned int offset; /* index of first waiting thread in array */
+ }
+ gl_waitqueue_t;
+typedef struct
+ {
+ gl_spinlock_t guard; /* protects the initialization */
+ CRITICAL_SECTION lock; /* protects the remaining fields */
+ gl_waitqueue_t waiting_readers; /* waiting readers */
+ gl_waitqueue_t waiting_writers; /* waiting writers */
+ int runcount; /* number of readers running, or -1 when a writer runs */
+ }
+ gl_rwlock_t;
+# define gl_rwlock_define(STORAGECLASS, NAME) \
+ STORAGECLASS gl_rwlock_t NAME;
+# define gl_rwlock_define_initialized(STORAGECLASS, NAME) \
+ STORAGECLASS gl_rwlock_t NAME = gl_rwlock_initializer;
+# define gl_rwlock_initializer \
+ { { 0, -1 } }
+# define glthread_rwlock_init(LOCK) \
+ (glthread_rwlock_init_func (LOCK), 0)
+extern void glthread_rwlock_init_func (gl_rwlock_t *lock);
+extern int glthread_rwlock_rdlock (gl_rwlock_t *lock);
+extern int glthread_rwlock_wrlock (gl_rwlock_t *lock);
+extern int glthread_rwlock_unlock (gl_rwlock_t *lock);
+extern int glthread_rwlock_destroy (gl_rwlock_t *lock);
+
+/* --------------------- gl_recursive_lock_t datatype --------------------- */
+
+/* The Win32 documentation says that CRITICAL_SECTION already implements a
+ recursive lock. But we need not rely on it: It's easy to implement a
+ recursive lock without this assumption. */
+
+typedef struct
+ {
+ gl_spinlock_t guard; /* protects the initialization */
+ DWORD owner;
+ unsigned long depth;
+ CRITICAL_SECTION lock;
+ }
+ gl_recursive_lock_t;
+# define gl_recursive_lock_define(STORAGECLASS, NAME) \
+ STORAGECLASS gl_recursive_lock_t NAME;
+# define gl_recursive_lock_define_initialized(STORAGECLASS, NAME) \
+ STORAGECLASS gl_recursive_lock_t NAME = gl_recursive_lock_initializer;
+# define gl_recursive_lock_initializer \
+ { { 0, -1 }, 0, 0 }
+# define glthread_recursive_lock_init(LOCK) \
+ (glthread_recursive_lock_init_func (LOCK), 0)
+extern void glthread_recursive_lock_init_func (gl_recursive_lock_t *lock);
+extern int glthread_recursive_lock_lock (gl_recursive_lock_t *lock);
+extern int glthread_recursive_lock_unlock (gl_recursive_lock_t *lock);
+extern int glthread_recursive_lock_destroy (gl_recursive_lock_t *lock);
+
+/* -------------------------- gl_once_t datatype -------------------------- */
+
+typedef struct
+ {
+ volatile int inited;
+ volatile long started;
+ CRITICAL_SECTION lock;
+ }
+ gl_once_t;
+# define gl_once_define(STORAGECLASS, NAME) \
+ STORAGECLASS gl_once_t NAME = { -1, -1 };
+# define glthread_once(ONCE_CONTROL, INITFUNCTION) \
+ (glthread_once_func (ONCE_CONTROL, INITFUNCTION), 0)
+extern void glthread_once_func (gl_once_t *once_control, void (*initfunction) (void));
+
+# ifdef __cplusplus
+}
+# endif
+
+#endif
+
+/* ========================================================================= */
+
+#if !(USE_POSIX_THREADS || USE_PTH_THREADS || USE_SOLARIS_THREADS || USE_WIN32_THREADS)
+
+/* Provide dummy implementation if threads are not supported. */
+
+/* -------------------------- gl_lock_t datatype -------------------------- */
+
+typedef int gl_lock_t;
+# define gl_lock_define(STORAGECLASS, NAME)
+# define gl_lock_define_initialized(STORAGECLASS, NAME)
+# define glthread_lock_init(NAME) 0
+# define glthread_lock_lock(NAME) 0
+# define glthread_lock_unlock(NAME) 0
+# define glthread_lock_destroy(NAME) 0
+
+/* ------------------------- gl_rwlock_t datatype ------------------------- */
+
+typedef int gl_rwlock_t;
+# define gl_rwlock_define(STORAGECLASS, NAME)
+# define gl_rwlock_define_initialized(STORAGECLASS, NAME)
+# define glthread_rwlock_init(NAME) 0
+# define glthread_rwlock_rdlock(NAME) 0
+# define glthread_rwlock_wrlock(NAME) 0
+# define glthread_rwlock_unlock(NAME) 0
+# define glthread_rwlock_destroy(NAME) 0
+
+/* --------------------- gl_recursive_lock_t datatype --------------------- */
+
+typedef int gl_recursive_lock_t;
+# define gl_recursive_lock_define(STORAGECLASS, NAME)
+# define gl_recursive_lock_define_initialized(STORAGECLASS, NAME)
+# define glthread_recursive_lock_init(NAME) 0
+# define glthread_recursive_lock_lock(NAME) 0
+# define glthread_recursive_lock_unlock(NAME) 0
+# define glthread_recursive_lock_destroy(NAME) 0
+
+/* -------------------------- gl_once_t datatype -------------------------- */
+
+typedef int gl_once_t;
+# define gl_once_define(STORAGECLASS, NAME) \
+ STORAGECLASS gl_once_t NAME = 0;
+# define glthread_once(ONCE_CONTROL, INITFUNCTION) \
+ (*(ONCE_CONTROL) == 0 ? (*(ONCE_CONTROL) = ~ 0, INITFUNCTION (), 0) : 0)
+
+#endif
+
+/* ========================================================================= */
+
+/* Macros with built-in error handling. */
+
+/* -------------------------- gl_lock_t datatype -------------------------- */
+
+#define gl_lock_init(NAME) \
+ do \
+ { \
+ if (glthread_lock_init (&NAME)) \
+ abort (); \
+ } \
+ while (0)
+#define gl_lock_lock(NAME) \
+ do \
+ { \
+ if (glthread_lock_lock (&NAME)) \
+ abort (); \
+ } \
+ while (0)
+#define gl_lock_unlock(NAME) \
+ do \
+ { \
+ if (glthread_lock_unlock (&NAME)) \
+ abort (); \
+ } \
+ while (0)
+#define gl_lock_destroy(NAME) \
+ do \
+ { \
+ if (glthread_lock_destroy (&NAME)) \
+ abort (); \
+ } \
+ while (0)
+
+/* ------------------------- gl_rwlock_t datatype ------------------------- */
+
+#define gl_rwlock_init(NAME) \
+ do \
+ { \
+ if (glthread_rwlock_init (&NAME)) \
+ abort (); \
+ } \
+ while (0)
+#define gl_rwlock_rdlock(NAME) \
+ do \
+ { \
+ if (glthread_rwlock_rdlock (&NAME)) \
+ abort (); \
+ } \
+ while (0)
+#define gl_rwlock_wrlock(NAME) \
+ do \
+ { \
+ if (glthread_rwlock_wrlock (&NAME)) \
+ abort (); \
+ } \
+ while (0)
+#define gl_rwlock_unlock(NAME) \
+ do \
+ { \
+ if (glthread_rwlock_unlock (&NAME)) \
+ abort (); \
+ } \
+ while (0)
+#define gl_rwlock_destroy(NAME) \
+ do \
+ { \
+ if (glthread_rwlock_destroy (&NAME)) \
+ abort (); \
+ } \
+ while (0)
+
+/* --------------------- gl_recursive_lock_t datatype --------------------- */
+
+#define gl_recursive_lock_init(NAME) \
+ do \
+ { \
+ if (glthread_recursive_lock_init (&NAME)) \
+ abort (); \
+ } \
+ while (0)
+#define gl_recursive_lock_lock(NAME) \
+ do \
+ { \
+ if (glthread_recursive_lock_lock (&NAME)) \
+ abort (); \
+ } \
+ while (0)
+#define gl_recursive_lock_unlock(NAME) \
+ do \
+ { \
+ if (glthread_recursive_lock_unlock (&NAME)) \
+ abort (); \
+ } \
+ while (0)
+#define gl_recursive_lock_destroy(NAME) \
+ do \
+ { \
+ if (glthread_recursive_lock_destroy (&NAME)) \
+ abort (); \
+ } \
+ while (0)
+
+/* -------------------------- gl_once_t datatype -------------------------- */
+
+#define gl_once(NAME, INITFUNCTION) \
+ do \
+ { \
+ if (glthread_once (&NAME, INITFUNCTION)) \
+ abort (); \
+ } \
+ while (0)
+
+/* ========================================================================= */
+
+#endif /* _LOCK_H */
--- /dev/null
+/* Thread-local storage in multithreaded situations.
+ Copyright (C) 2005-2008 Free Software Foundation, Inc.
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
+
+/* Written by Bruno Haible <bruno@clisp.org>, 2005. */
+
+#include <config.h>
+
+#include "glthread/tls.h"
+
+/* ========================================================================= */
+
+#if USE_POSIX_THREADS
+
+#endif
+
+/* ========================================================================= */
+
+#if USE_PTH_THREADS
+
+#endif
+
+/* ========================================================================= */
+
+#if USE_SOLARIS_THREADS
+
+/* Use the old Solaris threads library. */
+
+/* ------------------------- gl_tls_key_t datatype ------------------------- */
+
+void *
+glthread_tls_get_multithreaded (thread_key_t key)
+{
+ void *value;
+
+ if (thr_getspecific (key, &value) != 0)
+ abort ();
+ return value;
+}
+
+#endif
+
+/* ========================================================================= */
+
+#if USE_WIN32_THREADS
+
+#endif
+
+/* ========================================================================= */
--- /dev/null
+/* Thread-local storage in multithreaded situations.
+ Copyright (C) 2005, 2007-2008 Free Software Foundation, Inc.
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
+
+/* Written by Bruno Haible <bruno@clisp.org>, 2005. */
+
+/* This file contains thread-local storage primitives for use with a given
+ thread library. It does not contain primitives for creating threads or
+ for other multithreading primitives.
+
+ Type: gl_tls_key_t
+ Initialization: gl_tls_key_init (name, destructor);
+ Getting per-thread value: gl_tls_get (name)
+ Setting per-thread value: gl_tls_set (name, pointer);
+ De-initialization: gl_tls_key_destroy (name);
+ Equivalent functions with control of error handling:
+ Initialization: err = glthread_tls_key_init (&name, destructor);
+ Setting per-thread value: err = glthread_tls_set (&name, pointer);
+ De-initialization: err = glthread_tls_key_destroy (&name);
+
+ A per-thread value is of type 'void *'.
+
+ A destructor is a function pointer of type 'void (*) (void *)', called
+ when a thread exits, and taking the last per-thread value as argument. It
+ is unspecified whether the destructor function is called when the last
+ per-thread value is NULL. On some platforms, the destructor function is
+ not called at all.
+*/
+
+
+#ifndef _TLS_H
+#define _TLS_H
+
+#include <errno.h>
+
+/* ========================================================================= */
+
+#if USE_POSIX_THREADS
+
+/* Use the POSIX threads library. */
+
+# include <pthread.h>
+# include <stdlib.h>
+
+# if PTHREAD_IN_USE_DETECTION_HARD
+
+/* The pthread_in_use() detection needs to be done at runtime. */
+# define pthread_in_use() \
+ glthread_in_use ()
+extern int glthread_in_use (void);
+
+# endif
+
+# if USE_POSIX_THREADS_WEAK
+
+/* Use weak references to the POSIX threads library. */
+
+# pragma weak pthread_key_create
+# pragma weak pthread_getspecific
+# pragma weak pthread_setspecific
+# pragma weak pthread_key_delete
+# ifndef pthread_self
+# pragma weak pthread_self
+# endif
+
+# if !PTHREAD_IN_USE_DETECTION_HARD
+# pragma weak pthread_cancel
+# define pthread_in_use() (pthread_cancel != NULL)
+# endif
+
+# else
+
+# if !PTHREAD_IN_USE_DETECTION_HARD
+# define pthread_in_use() 1
+# endif
+
+# endif
+
+/* ------------------------- gl_tls_key_t datatype ------------------------- */
+
+typedef union
+ {
+ void *singlethread_value;
+ pthread_key_t key;
+ }
+ gl_tls_key_t;
+# define glthread_tls_key_init(KEY, DESTRUCTOR) \
+ (pthread_in_use () \
+ ? pthread_key_create (&(KEY)->key, DESTRUCTOR) \
+ : ((KEY)->singlethread_value = NULL, 0))
+# define gl_tls_get(NAME) \
+ (pthread_in_use () \
+ ? pthread_getspecific ((NAME).key) \
+ : (NAME).singlethread_value)
+# define glthread_tls_set(KEY, POINTER) \
+ (pthread_in_use () \
+ ? pthread_setspecific ((KEY)->key, (POINTER)) \
+ : ((KEY)->singlethread_value = (POINTER), 0))
+# define glthread_tls_key_destroy(KEY) \
+ (pthread_in_use () ? pthread_key_delete ((KEY)->key) : 0)
+
+#endif
+
+/* ========================================================================= */
+
+#if USE_PTH_THREADS
+
+/* Use the GNU Pth threads library. */
+
+# include <pth.h>
+# include <stdlib.h>
+
+# if USE_PTH_THREADS_WEAK
+
+/* Use weak references to the GNU Pth threads library. */
+
+# pragma weak pth_key_create
+# pragma weak pth_key_getdata
+# pragma weak pth_key_setdata
+# pragma weak pth_key_delete
+
+# pragma weak pth_cancel
+# define pth_in_use() (pth_cancel != NULL)
+
+# else
+
+# define pth_in_use() 1
+
+# endif
+
+/* ------------------------- gl_tls_key_t datatype ------------------------- */
+
+typedef union
+ {
+ void *singlethread_value;
+ pth_key_t key;
+ }
+ gl_tls_key_t;
+# define glthread_tls_key_init(KEY, DESTRUCTOR) \
+ (pth_in_use () \
+ ? (!pth_key_create (&(KEY)->key, DESTRUCTOR) ? errno : 0) \
+ : ((KEY)->singlethread_value = NULL, 0))
+# define gl_tls_get(NAME) \
+ (pth_in_use () \
+ ? pth_key_getdata ((NAME).key) \
+ : (NAME).singlethread_value)
+# define glthread_tls_set(KEY, POINTER) \
+ (pth_in_use () \
+ ? (!pth_key_setdata ((KEY)->key, (POINTER)) ? errno : 0) \
+ : ((KEY)->singlethread_value = (POINTER), 0))
+# define glthread_tls_key_destroy(KEY) \
+ (pth_in_use () \
+ ? (!pth_key_delete ((KEY)->key) ? errno : 0) \
+ : 0)
+
+#endif
+
+/* ========================================================================= */
+
+#if USE_SOLARIS_THREADS
+
+/* Use the old Solaris threads library. */
+
+# include <thread.h>
+# include <stdlib.h>
+
+# if USE_SOLARIS_THREADS_WEAK
+
+/* Use weak references to the old Solaris threads library. */
+
+# pragma weak thr_keycreate
+# pragma weak thr_getspecific
+# pragma weak thr_setspecific
+
+# pragma weak thr_suspend
+# define thread_in_use() (thr_suspend != NULL)
+
+# else
+
+# define thread_in_use() 1
+
+# endif
+
+/* ------------------------- gl_tls_key_t datatype ------------------------- */
+
+typedef union
+ {
+ void *singlethread_value;
+ thread_key_t key;
+ }
+ gl_tls_key_t;
+# define glthread_tls_key_init(KEY, DESTRUCTOR) \
+ (thread_in_use () \
+ ? thr_keycreate (&(KEY)->key, DESTRUCTOR) \
+ : ((KEY)->singlethread_value = NULL, 0))
+# define gl_tls_get(NAME) \
+ (thread_in_use () \
+ ? glthread_tls_get_multithreaded ((NAME).key) \
+ : (NAME).singlethread_value)
+extern void *glthread_tls_get_multithreaded (thread_key_t key);
+# define glthread_tls_set(KEY, POINTER) \
+ (thread_in_use () \
+ ? thr_setspecific ((KEY)->key, (POINTER)) \
+ : ((KEY)->singlethread_value = (POINTER), 0))
+# define glthread_tls_key_destroy(KEY) \
+ /* Unsupported. */ \
+ 0
+
+#endif
+
+/* ========================================================================= */
+
+#if USE_WIN32_THREADS
+
+# include <windows.h>
+
+/* ------------------------- gl_tls_key_t datatype ------------------------- */
+
+typedef DWORD gl_tls_key_t;
+# define glthread_tls_key_init(KEY, DESTRUCTOR) \
+ /* The destructor is unsupported. */ \
+ ((*(KEY) = TlsAlloc ()) == (DWORD)-1 ? EAGAIN : ((void) (DESTRUCTOR), 0))
+# define gl_tls_get(NAME) \
+ TlsGetValue (NAME)
+# define glthread_tls_set(KEY, POINTER) \
+ (!TlsSetValue (*(KEY), POINTER) ? EINVAL : 0)
+# define glthread_tls_key_destroy(KEY) \
+ (!TlsFree (*(KEY)) ? EINVAL : 0)
+
+#endif
+
+/* ========================================================================= */
+
+#if !(USE_POSIX_THREADS || USE_PTH_THREADS || USE_SOLARIS_THREADS || USE_WIN32_THREADS)
+
+/* Provide dummy implementation if threads are not supported. */
+
+/* ------------------------- gl_tls_key_t datatype ------------------------- */
+
+typedef struct
+ {
+ void *singlethread_value;
+ }
+ gl_tls_key_t;
+# define glthread_tls_key_init(KEY, DESTRUCTOR) \
+ ((KEY)->singlethread_value = NULL, \
+ (void) (DESTRUCTOR), \
+ 0)
+# define gl_tls_get(NAME) \
+ (NAME).singlethread_value
+# define glthread_tls_set(KEY, POINTER) \
+ ((KEY)->singlethread_value = (POINTER), 0)
+# define glthread_tls_key_destroy(KEY) \
+ 0
+
+#endif
+
+/* ========================================================================= */
+
+/* Macros with built-in error handling. */
+
+/* ------------------------- gl_tls_key_t datatype ------------------------- */
+
+#define gl_tls_key_init(NAME, DESTRUCTOR) \
+ do \
+ { \
+ if (glthread_tls_key_init (&NAME, DESTRUCTOR)) \
+ abort (); \
+ } \
+ while (0)
+#define gl_tls_set(NAME, POINTER) \
+ do \
+ { \
+ if (glthread_tls_set (&NAME, POINTER)) \
+ abort (); \
+ } \
+ while (0)
+#define gl_tls_key_destroy(NAME) \
+ do \
+ { \
+ if (glthread_tls_key_destroy (&NAME)) \
+ abort (); \
+ } \
+ while (0)
+
+/* ========================================================================= */
+
+#endif /* _TLS_H */
+++ /dev/null
-/* Locking in multithreaded situations.
- Copyright (C) 2005-2008 Free Software Foundation, Inc.
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2, or (at your option)
- any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software Foundation,
- Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
-
-/* Written by Bruno Haible <bruno@clisp.org>, 2005.
- Based on GCC's gthr-posix.h, gthr-posix95.h, gthr-solaris.h,
- gthr-win32.h. */
-
-#include <config.h>
-
-#include "lock.h"
-
-/* ========================================================================= */
-
-#if USE_POSIX_THREADS
-
-/* Use the POSIX threads library. */
-
-# if PTHREAD_IN_USE_DETECTION_HARD
-
-/* The function to be executed by a dummy thread. */
-static void *
-dummy_thread_func (void *arg)
-{
- return arg;
-}
-
-int
-glthread_in_use (void)
-{
- static int tested;
- static int result; /* 1: linked with -lpthread, 0: only with libc */
-
- if (!tested)
- {
- pthread_t thread;
-
- if (pthread_create (&thread, NULL, dummy_thread_func, NULL) != 0)
- /* Thread creation failed. */
- result = 0;
- else
- {
- /* Thread creation works. */
- void *retval;
- if (pthread_join (thread, &retval) != 0)
- abort ();
- result = 1;
- }
- tested = 1;
- }
- return result;
-}
-
-# endif
-
-/* -------------------------- gl_lock_t datatype -------------------------- */
-
-/* ------------------------- gl_rwlock_t datatype ------------------------- */
-
-# if HAVE_PTHREAD_RWLOCK
-
-# if !defined PTHREAD_RWLOCK_INITIALIZER
-
-int
-glthread_rwlock_init_multithreaded (gl_rwlock_t *lock)
-{
- int err;
-
- err = pthread_rwlock_init (&lock->rwlock, NULL);
- if (err != 0)
- return err;
- lock->initialized = 1;
- return 0;
-}
-
-int
-glthread_rwlock_rdlock_multithreaded (gl_rwlock_t *lock)
-{
- if (!lock->initialized)
- {
- int err;
-
- err = pthread_mutex_lock (&lock->guard);
- if (err != 0)
- return err;
- if (!lock->initialized)
- {
- err = glthread_rwlock_init_multithreaded (lock);
- if (err != 0)
- {
- pthread_mutex_unlock (&lock->guard);
- return err;
- }
- }
- err = pthread_mutex_unlock (&lock->guard);
- if (err != 0)
- return err;
- }
- return pthread_rwlock_rdlock (&lock->rwlock);
-}
-
-int
-glthread_rwlock_wrlock_multithreaded (gl_rwlock_t *lock)
-{
- if (!lock->initialized)
- {
- int err;
-
- err = pthread_mutex_lock (&lock->guard);
- if (err != 0)
- return err;
- if (!lock->initialized)
- {
- err = glthread_rwlock_init_multithreaded (lock);
- if (err != 0)
- {
- pthread_mutex_unlock (&lock->guard);
- return err;
- }
- }
- err = pthread_mutex_unlock (&lock->guard);
- if (err != 0)
- return err;
- }
- return pthread_rwlock_wrlock (&lock->rwlock);
-}
-
-int
-glthread_rwlock_unlock_multithreaded (gl_rwlock_t *lock)
-{
- if (!lock->initialized)
- return EINVAL;
- return pthread_rwlock_unlock (&lock->rwlock);
-}
-
-int
-glthread_rwlock_destroy_multithreaded (gl_rwlock_t *lock)
-{
- int err;
-
- if (!lock->initialized)
- return EINVAL;
- err = pthread_rwlock_destroy (&lock->rwlock);
- if (err != 0)
- return err;
- lock->initialized = 0;
- return 0;
-}
-
-# endif
-
-# else
-
-int
-glthread_rwlock_init_multithreaded (gl_rwlock_t *lock)
-{
- int err;
-
- err = pthread_mutex_init (&lock->lock, NULL);
- if (err != 0)
- return err;
- err = pthread_cond_init (&lock->waiting_readers, NULL);
- if (err != 0)
- return err;
- err = pthread_cond_init (&lock->waiting_writers, NULL);
- if (err != 0)
- return err;
- lock->waiting_writers_count = 0;
- lock->runcount = 0;
- return 0;
-}
-
-int
-glthread_rwlock_rdlock_multithreaded (gl_rwlock_t *lock)
-{
- int err;
-
- err = pthread_mutex_lock (&lock->lock);
- if (err != 0)
- return err;
- /* Test whether only readers are currently running, and whether the runcount
- field will not overflow. */
- /* POSIX says: "It is implementation-defined whether the calling thread
- acquires the lock when a writer does not hold the lock and there are
- writers blocked on the lock." Let's say, no: give the writers a higher
- priority. */
- while (!(lock->runcount + 1 > 0 && lock->waiting_writers_count == 0))
- {
- /* This thread has to wait for a while. Enqueue it among the
- waiting_readers. */
- err = pthread_cond_wait (&lock->waiting_readers, &lock->lock);
- if (err != 0)
- {
- pthread_mutex_unlock (&lock->lock);
- return err;
- }
- }
- lock->runcount++;
- return pthread_mutex_unlock (&lock->lock);
-}
-
-int
-glthread_rwlock_wrlock_multithreaded (gl_rwlock_t *lock)
-{
- int err;
-
- err = pthread_mutex_lock (&lock->lock);
- if (err != 0)
- return err;
- /* Test whether no readers or writers are currently running. */
- while (!(lock->runcount == 0))
- {
- /* This thread has to wait for a while. Enqueue it among the
- waiting_writers. */
- lock->waiting_writers_count++;
- err = pthread_cond_wait (&lock->waiting_writers, &lock->lock);
- if (err != 0)
- {
- lock->waiting_writers_count--;
- pthread_mutex_unlock (&lock->lock);
- return err;
- }
- lock->waiting_writers_count--;
- }
- lock->runcount--; /* runcount becomes -1 */
- return pthread_mutex_unlock (&lock->lock);
-}
-
-int
-glthread_rwlock_unlock_multithreaded (gl_rwlock_t *lock)
-{
- int err;
-
- err = pthread_mutex_lock (&lock->lock);
- if (err != 0)
- return err;
- if (lock->runcount < 0)
- {
- /* Drop a writer lock. */
- if (!(lock->runcount == -1))
- {
- pthread_mutex_unlock (&lock->lock);
- return EINVAL;
- }
- lock->runcount = 0;
- }
- else
- {
- /* Drop a reader lock. */
- if (!(lock->runcount > 0))
- {
- pthread_mutex_unlock (&lock->lock);
- return EINVAL;
- }
- lock->runcount--;
- }
- if (lock->runcount == 0)
- {
- /* POSIX recommends that "write locks shall take precedence over read
- locks", to avoid "writer starvation". */
- if (lock->waiting_writers_count > 0)
- {
- /* Wake up one of the waiting writers. */
- err = pthread_cond_signal (&lock->waiting_writers);
- if (err != 0)
- {
- pthread_mutex_unlock (&lock->lock);
- return err;
- }
- }
- else
- {
- /* Wake up all waiting readers. */
- err = pthread_cond_broadcast (&lock->waiting_readers);
- if (err != 0)
- {
- pthread_mutex_unlock (&lock->lock);
- return err;
- }
- }
- }
- return pthread_mutex_unlock (&lock->lock);
-}
-
-int
-glthread_rwlock_destroy_multithreaded (gl_rwlock_t *lock)
-{
- int err;
-
- err = pthread_mutex_destroy (&lock->lock);
- if (err != 0)
- return err;
- err = pthread_cond_destroy (&lock->waiting_readers);
- if (err != 0)
- return err;
- err = pthread_cond_destroy (&lock->waiting_writers);
- if (err != 0)
- return err;
- return 0;
-}
-
-# endif
-
-/* --------------------- gl_recursive_lock_t datatype --------------------- */
-
-# if HAVE_PTHREAD_MUTEX_RECURSIVE
-
-# if defined PTHREAD_RECURSIVE_MUTEX_INITIALIZER || defined PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP
-
-int
-glthread_recursive_lock_init_multithreaded (gl_recursive_lock_t *lock)
-{
- pthread_mutexattr_t attributes;
- int err;
-
- err = pthread_mutexattr_init (&attributes);
- if (err != 0)
- return err;
- err = pthread_mutexattr_settype (&attributes, PTHREAD_MUTEX_RECURSIVE);
- if (err != 0)
- {
- pthread_mutexattr_destroy (&attributes);
- return err;
- }
- err = pthread_mutex_init (lock, &attributes);
- if (err != 0)
- {
- pthread_mutexattr_destroy (&attributes);
- return err;
- }
- err = pthread_mutexattr_destroy (&attributes);
- if (err != 0)
- return err;
- return 0;
-}
-
-# else
-
-int
-glthread_recursive_lock_init_multithreaded (gl_recursive_lock_t *lock)
-{
- pthread_mutexattr_t attributes;
- int err;
-
- err = pthread_mutexattr_init (&attributes);
- if (err != 0)
- return err;
- err = pthread_mutexattr_settype (&attributes, PTHREAD_MUTEX_RECURSIVE);
- if (err != 0)
- {
- pthread_mutexattr_destroy (&attributes);
- return err;
- }
- err = pthread_mutex_init (&lock->recmutex, &attributes);
- if (err != 0)
- {
- pthread_mutexattr_destroy (&attributes);
- return err;
- }
- err = pthread_mutexattr_destroy (&attributes);
- if (err != 0)
- return err;
- lock->initialized = 1;
- return 0;
-}
-
-int
-glthread_recursive_lock_lock_multithreaded (gl_recursive_lock_t *lock)
-{
- if (!lock->initialized)
- {
- int err;
-
- err = pthread_mutex_lock (&lock->guard);
- if (err != 0)
- return err;
- if (!lock->initialized)
- {
- err = glthread_recursive_lock_init_multithreaded (lock);
- if (err != 0)
- {
- pthread_mutex_unlock (&lock->guard);
- return err;
- }
- }
- err = pthread_mutex_unlock (&lock->guard);
- if (err != 0)
- return err;
- }
- return pthread_mutex_lock (&lock->recmutex);
-}
-
-int
-glthread_recursive_lock_unlock_multithreaded (gl_recursive_lock_t *lock)
-{
- if (!lock->initialized)
- return EINVAL;
- return pthread_mutex_unlock (&lock->recmutex);
-}
-
-int
-glthread_recursive_lock_destroy_multithreaded (gl_recursive_lock_t *lock)
-{
- int err;
-
- if (!lock->initialized)
- return EINVAL;
- err = pthread_mutex_destroy (&lock->recmutex);
- if (err != 0)
- return err;
- lock->initialized = 0;
- return 0;
-}
-
-# endif
-
-# else
-
-int
-glthread_recursive_lock_init_multithreaded (gl_recursive_lock_t *lock)
-{
- int err;
-
- err = pthread_mutex_init (&lock->mutex, NULL);
- if (err != 0)
- return err;
- lock->owner = (pthread_t) 0;
- lock->depth = 0;
- return 0;
-}
-
-int
-glthread_recursive_lock_lock_multithreaded (gl_recursive_lock_t *lock)
-{
- pthread_t self = pthread_self ();
- if (lock->owner != self)
- {
- int err;
-
- err = pthread_mutex_lock (&lock->mutex);
- if (err != 0)
- return err;
- lock->owner = self;
- }
- if (++(lock->depth) == 0) /* wraparound? */
- {
- lock->depth--;
- return EAGAIN;
- }
- return 0;
-}
-
-int
-glthread_recursive_lock_unlock_multithreaded (gl_recursive_lock_t *lock)
-{
- if (lock->owner != pthread_self ())
- return EPERM;
- if (lock->depth == 0)
- return EINVAL;
- if (--(lock->depth) == 0)
- {
- lock->owner = (pthread_t) 0;
- return pthread_mutex_unlock (&lock->mutex);
- }
- else
- return 0;
-}
-
-int
-glthread_recursive_lock_destroy_multithreaded (gl_recursive_lock_t *lock)
-{
- if (lock->owner != (pthread_t) 0)
- return EBUSY;
- return (pthread_mutex_destroy (&lock->mutex);
-}
-
-# endif
-
-/* -------------------------- gl_once_t datatype -------------------------- */
-
-static const pthread_once_t fresh_once = PTHREAD_ONCE_INIT;
-
-int
-glthread_once_singlethreaded (pthread_once_t *once_control)
-{
- /* We don't know whether pthread_once_t is an integer type, a floating-point
- type, a pointer type, or a structure type. */
- char *firstbyte = (char *)once_control;
- if (*firstbyte == *(const char *)&fresh_once)
- {
- /* First time use of once_control. Invert the first byte. */
- *firstbyte = ~ *(const char *)&fresh_once;
- return 1;
- }
- else
- return 0;
-}
-
-#endif
-
-/* ========================================================================= */
-
-#if USE_PTH_THREADS
-
-/* Use the GNU Pth threads library. */
-
-/* -------------------------- gl_lock_t datatype -------------------------- */
-
-/* ------------------------- gl_rwlock_t datatype ------------------------- */
-
-/* --------------------- gl_recursive_lock_t datatype --------------------- */
-
-/* -------------------------- gl_once_t datatype -------------------------- */
-
-static void
-glthread_once_call (void *arg)
-{
- void (**gl_once_temp_addr) (void) = (void (**) (void)) arg;
- void (*initfunction) (void) = *gl_once_temp_addr;
- initfunction ();
-}
-
-int
-glthread_once_multithreaded (pth_once_t *once_control, void (*initfunction) (void))
-{
- void (*temp) (void) = initfunction;
- return (!pth_once (once_control, glthread_once_call, &temp) ? errno : 0);
-}
-
-int
-glthread_once_singlethreaded (pth_once_t *once_control)
-{
- /* We know that pth_once_t is an integer type. */
- if (*once_control == PTH_ONCE_INIT)
- {
- /* First time use of once_control. Invert the marker. */
- *once_control = ~ PTH_ONCE_INIT;
- return 1;
- }
- else
- return 0;
-}
-
-#endif
-
-/* ========================================================================= */
-
-#if USE_SOLARIS_THREADS
-
-/* Use the old Solaris threads library. */
-
-/* -------------------------- gl_lock_t datatype -------------------------- */
-
-/* ------------------------- gl_rwlock_t datatype ------------------------- */
-
-/* --------------------- gl_recursive_lock_t datatype --------------------- */
-
-int
-glthread_recursive_lock_init_multithreaded (gl_recursive_lock_t *lock)
-{
- int err;
-
- err = mutex_init (&lock->mutex, USYNC_THREAD, NULL);
- if (err != 0)
- return err;
- lock->owner = (thread_t) 0;
- lock->depth = 0;
- return 0;
-}
-
-int
-glthread_recursive_lock_lock_multithreaded (gl_recursive_lock_t *lock)
-{
- thread_t self = thr_self ();
- if (lock->owner != self)
- {
- int err;
-
- err = mutex_lock (&lock->mutex);
- if (err != 0)
- return err;
- lock->owner = self;
- }
- if (++(lock->depth) == 0) /* wraparound? */
- {
- lock->depth--;
- return EAGAIN;
- }
- return 0;
-}
-
-int
-glthread_recursive_lock_unlock_multithreaded (gl_recursive_lock_t *lock)
-{
- if (lock->owner != thr_self ())
- return EPERM;
- if (lock->depth == 0)
- return EINVAL;
- if (--(lock->depth) == 0)
- {
- lock->owner = (thread_t) 0;
- return mutex_unlock (&lock->mutex);
- }
- else
- return 0;
-}
-
-int
-glthread_recursive_lock_destroy_multithreaded (gl_recursive_lock_t *lock)
-{
- if (lock->owner != (thread_t) 0)
- return EBUSY;
- return mutex_destroy (&lock->mutex);
-}
-
-/* -------------------------- gl_once_t datatype -------------------------- */
-
-int
-glthread_once_multithreaded (gl_once_t *once_control, void (*initfunction) (void))
-{
- if (!once_control->inited)
- {
- int err;
-
- /* Use the mutex to guarantee that if another thread is already calling
- the initfunction, this thread waits until it's finished. */
- err = mutex_lock (&once_control->mutex);
- if (err != 0)
- return err;
- if (!once_control->inited)
- {
- once_control->inited = 1;
- initfunction ();
- }
- return mutex_unlock (&once_control->mutex);
- }
- else
- return 0;
-}
-
-int
-glthread_once_singlethreaded (gl_once_t *once_control)
-{
- /* We know that gl_once_t contains an integer type. */
- if (!once_control->inited)
- {
- /* First time use of once_control. Invert the marker. */
- once_control->inited = ~ 0;
- return 1;
- }
- else
- return 0;
-}
-
-#endif
-
-/* ========================================================================= */
-
-#if USE_WIN32_THREADS
-
-/* -------------------------- gl_lock_t datatype -------------------------- */
-
-void
-glthread_lock_init_func (gl_lock_t *lock)
-{
- InitializeCriticalSection (&lock->lock);
- lock->guard.done = 1;
-}
-
-int
-glthread_lock_lock (gl_lock_t *lock)
-{
- if (!lock->guard.done)
- {
- if (InterlockedIncrement (&lock->guard.started) == 0)
- /* This thread is the first one to need this lock. Initialize it. */
- glthread_lock_init (lock);
- else
- /* Yield the CPU while waiting for another thread to finish
- initializing this lock. */
- while (!lock->guard.done)
- Sleep (0);
- }
- EnterCriticalSection (&lock->lock);
- return 0;
-}
-
-int
-glthread_lock_unlock (gl_lock_t *lock)
-{
- if (!lock->guard.done)
- return EINVAL;
- LeaveCriticalSection (&lock->lock);
- return 0;
-}
-
-int
-glthread_lock_destroy (gl_lock_t *lock)
-{
- if (!lock->guard.done)
- return EINVAL;
- DeleteCriticalSection (&lock->lock);
- lock->guard.done = 0;
- return 0;
-}
-
-/* ------------------------- gl_rwlock_t datatype ------------------------- */
-
-static inline void
-gl_waitqueue_init (gl_waitqueue_t *wq)
-{
- wq->array = NULL;
- wq->count = 0;
- wq->alloc = 0;
- wq->offset = 0;
-}
-
-/* Enqueues the current thread, represented by an event, in a wait queue.
- Returns INVALID_HANDLE_VALUE if an allocation failure occurs. */
-static HANDLE
-gl_waitqueue_add (gl_waitqueue_t *wq)
-{
- HANDLE event;
- unsigned int index;
-
- if (wq->count == wq->alloc)
- {
- unsigned int new_alloc = 2 * wq->alloc + 1;
- HANDLE *new_array =
- (HANDLE *) realloc (wq->array, new_alloc * sizeof (HANDLE));
- if (new_array == NULL)
- /* No more memory. */
- return INVALID_HANDLE_VALUE;
- /* Now is a good opportunity to rotate the array so that its contents
- starts at offset 0. */
- if (wq->offset > 0)
- {
- unsigned int old_count = wq->count;
- unsigned int old_alloc = wq->alloc;
- unsigned int old_offset = wq->offset;
- unsigned int i;
- if (old_offset + old_count > old_alloc)
- {
- unsigned int limit = old_offset + old_count - old_alloc;
- for (i = 0; i < limit; i++)
- new_array[old_alloc + i] = new_array[i];
- }
- for (i = 0; i < old_count; i++)
- new_array[i] = new_array[old_offset + i];
- wq->offset = 0;
- }
- wq->array = new_array;
- wq->alloc = new_alloc;
- }
- event = CreateEvent (NULL, TRUE, FALSE, NULL);
- if (event == INVALID_HANDLE_VALUE)
- /* No way to allocate an event. */
- return INVALID_HANDLE_VALUE;
- index = wq->offset + wq->count;
- if (index >= wq->alloc)
- index -= wq->alloc;
- wq->array[index] = event;
- wq->count++;
- return event;
-}
-
-/* Notifies the first thread from a wait queue and dequeues it. */
-static inline void
-gl_waitqueue_notify_first (gl_waitqueue_t *wq)
-{
- SetEvent (wq->array[wq->offset + 0]);
- wq->offset++;
- wq->count--;
- if (wq->count == 0 || wq->offset == wq->alloc)
- wq->offset = 0;
-}
-
-/* Notifies all threads from a wait queue and dequeues them all. */
-static inline void
-gl_waitqueue_notify_all (gl_waitqueue_t *wq)
-{
- unsigned int i;
-
- for (i = 0; i < wq->count; i++)
- {
- unsigned int index = wq->offset + i;
- if (index >= wq->alloc)
- index -= wq->alloc;
- SetEvent (wq->array[index]);
- }
- wq->count = 0;
- wq->offset = 0;
-}
-
-void
-glthread_rwlock_init_func (gl_rwlock_t *lock)
-{
- InitializeCriticalSection (&lock->lock);
- gl_waitqueue_init (&lock->waiting_readers);
- gl_waitqueue_init (&lock->waiting_writers);
- lock->runcount = 0;
- lock->guard.done = 1;
-}
-
-int
-glthread_rwlock_rdlock (gl_rwlock_t *lock)
-{
- if (!lock->guard.done)
- {
- if (InterlockedIncrement (&lock->guard.started) == 0)
- /* This thread is the first one to need this lock. Initialize it. */
- glthread_rwlock_init (lock);
- else
- /* Yield the CPU while waiting for another thread to finish
- initializing this lock. */
- while (!lock->guard.done)
- Sleep (0);
- }
- EnterCriticalSection (&lock->lock);
- /* Test whether only readers are currently running, and whether the runcount
- field will not overflow. */
- if (!(lock->runcount + 1 > 0))
- {
- /* This thread has to wait for a while. Enqueue it among the
- waiting_readers. */
- HANDLE event = gl_waitqueue_add (&lock->waiting_readers);
- if (event != INVALID_HANDLE_VALUE)
- {
- DWORD result;
- LeaveCriticalSection (&lock->lock);
- /* Wait until another thread signals this event. */
- result = WaitForSingleObject (event, INFINITE);
- if (result == WAIT_FAILED || result == WAIT_TIMEOUT)
- abort ();
- CloseHandle (event);
- /* The thread which signalled the event already did the bookkeeping:
- removed us from the waiting_readers, incremented lock->runcount. */
- if (!(lock->runcount > 0))
- abort ();
- return 0;
- }
- else
- {
- /* Allocation failure. Weird. */
- do
- {
- LeaveCriticalSection (&lock->lock);
- Sleep (1);
- EnterCriticalSection (&lock->lock);
- }
- while (!(lock->runcount + 1 > 0));
- }
- }
- lock->runcount++;
- LeaveCriticalSection (&lock->lock);
- return 0;
-}
-
-int
-glthread_rwlock_wrlock (gl_rwlock_t *lock)
-{
- if (!lock->guard.done)
- {
- if (InterlockedIncrement (&lock->guard.started) == 0)
- /* This thread is the first one to need this lock. Initialize it. */
- glthread_rwlock_init (lock);
- else
- /* Yield the CPU while waiting for another thread to finish
- initializing this lock. */
- while (!lock->guard.done)
- Sleep (0);
- }
- EnterCriticalSection (&lock->lock);
- /* Test whether no readers or writers are currently running. */
- if (!(lock->runcount == 0))
- {
- /* This thread has to wait for a while. Enqueue it among the
- waiting_writers. */
- HANDLE event = gl_waitqueue_add (&lock->waiting_writers);
- if (event != INVALID_HANDLE_VALUE)
- {
- DWORD result;
- LeaveCriticalSection (&lock->lock);
- /* Wait until another thread signals this event. */
- result = WaitForSingleObject (event, INFINITE);
- if (result == WAIT_FAILED || result == WAIT_TIMEOUT)
- abort ();
- CloseHandle (event);
- /* The thread which signalled the event already did the bookkeeping:
- removed us from the waiting_writers, set lock->runcount = -1. */
- if (!(lock->runcount == -1))
- abort ();
- return 0;
- }
- else
- {
- /* Allocation failure. Weird. */
- do
- {
- LeaveCriticalSection (&lock->lock);
- Sleep (1);
- EnterCriticalSection (&lock->lock);
- }
- while (!(lock->runcount == 0));
- }
- }
- lock->runcount--; /* runcount becomes -1 */
- LeaveCriticalSection (&lock->lock);
- return 0;
-}
-
-int
-glthread_rwlock_unlock (gl_rwlock_t *lock)
-{
- if (!lock->guard.done)
- return EINVAL;
- EnterCriticalSection (&lock->lock);
- if (lock->runcount < 0)
- {
- /* Drop a writer lock. */
- if (!(lock->runcount == -1))
- abort ();
- lock->runcount = 0;
- }
- else
- {
- /* Drop a reader lock. */
- if (!(lock->runcount > 0))
- {
- LeaveCriticalSection (&lock->lock);
- return EPERM;
- }
- lock->runcount--;
- }
- if (lock->runcount == 0)
- {
- /* POSIX recommends that "write locks shall take precedence over read
- locks", to avoid "writer starvation". */
- if (lock->waiting_writers.count > 0)
- {
- /* Wake up one of the waiting writers. */
- lock->runcount--;
- gl_waitqueue_notify_first (&lock->waiting_writers);
- }
- else
- {
- /* Wake up all waiting readers. */
- lock->runcount += lock->waiting_readers.count;
- gl_waitqueue_notify_all (&lock->waiting_readers);
- }
- }
- LeaveCriticalSection (&lock->lock);
- return 0;
-}
-
-int
-glthread_rwlock_destroy (gl_rwlock_t *lock)
-{
- if (!lock->guard.done)
- return EINVAL;
- if (lock->runcount != 0)
- return EBUSY;
- DeleteCriticalSection (&lock->lock);
- if (lock->waiting_readers.array != NULL)
- free (lock->waiting_readers.array);
- if (lock->waiting_writers.array != NULL)
- free (lock->waiting_writers.array);
- lock->guard.done = 0;
- return 0;
-}
-
-/* --------------------- gl_recursive_lock_t datatype --------------------- */
-
-void
-glthread_recursive_lock_init_func (gl_recursive_lock_t *lock)
-{
- lock->owner = 0;
- lock->depth = 0;
- InitializeCriticalSection (&lock->lock);
- lock->guard.done = 1;
-}
-
-int
-glthread_recursive_lock_lock (gl_recursive_lock_t *lock)
-{
- if (!lock->guard.done)
- {
- if (InterlockedIncrement (&lock->guard.started) == 0)
- /* This thread is the first one to need this lock. Initialize it. */
- glthread_recursive_lock_init (lock);
- else
- /* Yield the CPU while waiting for another thread to finish
- initializing this lock. */
- while (!lock->guard.done)
- Sleep (0);
- }
- {
- DWORD self = GetCurrentThreadId ();
- if (lock->owner != self)
- {
- EnterCriticalSection (&lock->lock);
- lock->owner = self;
- }
- if (++(lock->depth) == 0) /* wraparound? */
- {
- lock->depth--;
- return EAGAIN;
- }
- }
- return 0;
-}
-
-int
-glthread_recursive_lock_unlock (gl_recursive_lock_t *lock)
-{
- if (lock->owner != GetCurrentThreadId ())
- return EPERM;
- if (lock->depth == 0)
- return EINVAL;
- if (--(lock->depth) == 0)
- {
- lock->owner = 0;
- LeaveCriticalSection (&lock->lock);
- }
- return 0;
-}
-
-int
-glthread_recursive_lock_destroy (gl_recursive_lock_t *lock)
-{
- if (lock->owner != 0)
- return EBUSY;
- DeleteCriticalSection (&lock->lock);
- lock->guard.done = 0;
- return 0;
-}
-
-/* -------------------------- gl_once_t datatype -------------------------- */
-
-void
-glthread_once_func (gl_once_t *once_control, void (*initfunction) (void))
-{
- if (once_control->inited <= 0)
- {
- if (InterlockedIncrement (&once_control->started) == 0)
- {
- /* This thread is the first one to come to this once_control. */
- InitializeCriticalSection (&once_control->lock);
- EnterCriticalSection (&once_control->lock);
- once_control->inited = 0;
- initfunction ();
- once_control->inited = 1;
- LeaveCriticalSection (&once_control->lock);
- }
- else
- {
- /* Undo last operation. */
- InterlockedDecrement (&once_control->started);
- /* Some other thread has already started the initialization.
- Yield the CPU while waiting for the other thread to finish
- initializing and taking the lock. */
- while (once_control->inited < 0)
- Sleep (0);
- if (once_control->inited <= 0)
- {
- /* Take the lock. This blocks until the other thread has
- finished calling the initfunction. */
- EnterCriticalSection (&once_control->lock);
- LeaveCriticalSection (&once_control->lock);
- if (!(once_control->inited > 0))
- abort ();
- }
- }
- }
-}
-
-#endif
-
-/* ========================================================================= */
+++ /dev/null
-/* Locking in multithreaded situations.
- Copyright (C) 2005-2008 Free Software Foundation, Inc.
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2, or (at your option)
- any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software Foundation,
- Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
-
-/* Written by Bruno Haible <bruno@clisp.org>, 2005.
- Based on GCC's gthr-posix.h, gthr-posix95.h, gthr-solaris.h,
- gthr-win32.h. */
-
-/* This file contains locking primitives for use with a given thread library.
- It does not contain primitives for creating threads or for other
- synchronization primitives.
-
- Normal (non-recursive) locks:
- Type: gl_lock_t
- Declaration: gl_lock_define(extern, name)
- Initializer: gl_lock_define_initialized(, name)
- Initialization: gl_lock_init (name);
- Taking the lock: gl_lock_lock (name);
- Releasing the lock: gl_lock_unlock (name);
- De-initialization: gl_lock_destroy (name);
- Equivalent functions with control of error handling:
- Initialization: err = glthread_lock_init (&name);
- Taking the lock: err = glthread_lock_lock (&name);
- Releasing the lock: err = glthread_lock_unlock (&name);
- De-initialization: err = glthread_lock_destroy (&name);
-
- Read-Write (non-recursive) locks:
- Type: gl_rwlock_t
- Declaration: gl_rwlock_define(extern, name)
- Initializer: gl_rwlock_define_initialized(, name)
- Initialization: gl_rwlock_init (name);
- Taking the lock: gl_rwlock_rdlock (name);
- gl_rwlock_wrlock (name);
- Releasing the lock: gl_rwlock_unlock (name);
- De-initialization: gl_rwlock_destroy (name);
- Equivalent functions with control of error handling:
- Initialization: err = glthread_rwlock_init (&name);
- Taking the lock: err = glthread_rwlock_rdlock (&name);
- err = glthread_rwlock_wrlock (&name);
- Releasing the lock: err = glthread_rwlock_unlock (&name);
- De-initialization: err = glthread_rwlock_destroy (&name);
-
- Recursive locks:
- Type: gl_recursive_lock_t
- Declaration: gl_recursive_lock_define(extern, name)
- Initializer: gl_recursive_lock_define_initialized(, name)
- Initialization: gl_recursive_lock_init (name);
- Taking the lock: gl_recursive_lock_lock (name);
- Releasing the lock: gl_recursive_lock_unlock (name);
- De-initialization: gl_recursive_lock_destroy (name);
- Equivalent functions with control of error handling:
- Initialization: err = glthread_recursive_lock_init (&name);
- Taking the lock: err = glthread_recursive_lock_lock (&name);
- Releasing the lock: err = glthread_recursive_lock_unlock (&name);
- De-initialization: err = glthread_recursive_lock_destroy (&name);
-
- Once-only execution:
- Type: gl_once_t
- Initializer: gl_once_define(extern, name)
- Execution: gl_once (name, initfunction);
- Equivalent functions with control of error handling:
- Execution: err = glthread_once (&name, initfunction);
-*/
-
-
-#ifndef _LOCK_H
-#define _LOCK_H
-
-#include <errno.h>
-
-/* ========================================================================= */
-
-#if USE_POSIX_THREADS
-
-/* Use the POSIX threads library. */
-
-# include <pthread.h>
-# include <stdlib.h>
-
-# ifdef __cplusplus
-extern "C" {
-# endif
-
-# if PTHREAD_IN_USE_DETECTION_HARD
-
-/* The pthread_in_use() detection needs to be done at runtime. */
-# define pthread_in_use() \
- glthread_in_use ()
-extern int glthread_in_use (void);
-
-# endif
-
-# if USE_POSIX_THREADS_WEAK
-
-/* Use weak references to the POSIX threads library. */
-
-/* Weak references avoid dragging in external libraries if the other parts
- of the program don't use them. Here we use them, because we don't want
- every program that uses libintl to depend on libpthread. This assumes
- that libpthread would not be loaded after libintl; i.e. if libintl is
- loaded first, by an executable that does not depend on libpthread, and
- then a module is dynamically loaded that depends on libpthread, libintl
- will not be multithread-safe. */
-
-/* The way to test at runtime whether libpthread is present is to test
- whether a function pointer's value, such as &pthread_mutex_init, is
- non-NULL. However, some versions of GCC have a bug through which, in
- PIC mode, &foo != NULL always evaluates to true if there is a direct
- call to foo(...) in the same function. To avoid this, we test the
- address of a function in libpthread that we don't use. */
-
-# pragma weak pthread_mutex_init
-# pragma weak pthread_mutex_lock
-# pragma weak pthread_mutex_unlock
-# pragma weak pthread_mutex_destroy
-# pragma weak pthread_rwlock_init
-# pragma weak pthread_rwlock_rdlock
-# pragma weak pthread_rwlock_wrlock
-# pragma weak pthread_rwlock_unlock
-# pragma weak pthread_rwlock_destroy
-# pragma weak pthread_once
-# pragma weak pthread_cond_init
-# pragma weak pthread_cond_wait
-# pragma weak pthread_cond_signal
-# pragma weak pthread_cond_broadcast
-# pragma weak pthread_cond_destroy
-# pragma weak pthread_mutexattr_init
-# pragma weak pthread_mutexattr_settype
-# pragma weak pthread_mutexattr_destroy
-# ifndef pthread_self
-# pragma weak pthread_self
-# endif
-
-# if !PTHREAD_IN_USE_DETECTION_HARD
-# pragma weak pthread_cancel
-# define pthread_in_use() (pthread_cancel != NULL)
-# endif
-
-# else
-
-# if !PTHREAD_IN_USE_DETECTION_HARD
-# define pthread_in_use() 1
-# endif
-
-# endif
-
-/* -------------------------- gl_lock_t datatype -------------------------- */
-
-typedef pthread_mutex_t gl_lock_t;
-# define gl_lock_define(STORAGECLASS, NAME) \
- STORAGECLASS pthread_mutex_t NAME;
-# define gl_lock_define_initialized(STORAGECLASS, NAME) \
- STORAGECLASS pthread_mutex_t NAME = gl_lock_initializer;
-# define gl_lock_initializer \
- PTHREAD_MUTEX_INITIALIZER
-# define glthread_lock_init(LOCK) \
- (pthread_in_use () ? pthread_mutex_init (LOCK, NULL) : 0)
-# define glthread_lock_lock(LOCK) \
- (pthread_in_use () ? pthread_mutex_lock (LOCK) : 0)
-# define glthread_lock_unlock(LOCK) \
- (pthread_in_use () ? pthread_mutex_unlock (LOCK) : 0)
-# define glthread_lock_destroy(LOCK) \
- (pthread_in_use () ? pthread_mutex_destroy (LOCK) : 0)
-
-/* ------------------------- gl_rwlock_t datatype ------------------------- */
-
-# if HAVE_PTHREAD_RWLOCK
-
-# ifdef PTHREAD_RWLOCK_INITIALIZER
-
-typedef pthread_rwlock_t gl_rwlock_t;
-# define gl_rwlock_define(STORAGECLASS, NAME) \
- STORAGECLASS pthread_rwlock_t NAME;
-# define gl_rwlock_define_initialized(STORAGECLASS, NAME) \
- STORAGECLASS pthread_rwlock_t NAME = gl_rwlock_initializer;
-# define gl_rwlock_initializer \
- PTHREAD_RWLOCK_INITIALIZER
-# define glthread_rwlock_init(LOCK) \
- (pthread_in_use () ? pthread_rwlock_init (LOCK, NULL) : 0)
-# define glthread_rwlock_rdlock(LOCK) \
- (pthread_in_use () ? pthread_rwlock_rdlock (LOCK) : 0)
-# define glthread_rwlock_wrlock(LOCK) \
- (pthread_in_use () ? pthread_rwlock_wrlock (LOCK) : 0)
-# define glthread_rwlock_unlock(LOCK) \
- (pthread_in_use () ? pthread_rwlock_unlock (LOCK) : 0)
-# define glthread_rwlock_destroy(LOCK) \
- (pthread_in_use () ? pthread_rwlock_destroy (LOCK) : 0)
-
-# else
-
-typedef struct
- {
- int initialized;
- pthread_mutex_t guard; /* protects the initialization */
- pthread_rwlock_t rwlock; /* read-write lock */
- }
- gl_rwlock_t;
-# define gl_rwlock_define(STORAGECLASS, NAME) \
- STORAGECLASS gl_rwlock_t NAME;
-# define gl_rwlock_define_initialized(STORAGECLASS, NAME) \
- STORAGECLASS gl_rwlock_t NAME = gl_rwlock_initializer;
-# define gl_rwlock_initializer \
- { 0, PTHREAD_MUTEX_INITIALIZER }
-# define glthread_rwlock_init(LOCK) \
- (pthread_in_use () ? glthread_rwlock_init_multithreaded (LOCK) : 0)
-# define glthread_rwlock_rdlock(LOCK) \
- (pthread_in_use () ? glthread_rwlock_rdlock_multithreaded (LOCK) : 0)
-# define glthread_rwlock_wrlock(LOCK) \
- (pthread_in_use () ? glthread_rwlock_wrlock_multithreaded (LOCK) : 0)
-# define glthread_rwlock_unlock(LOCK) \
- (pthread_in_use () ? glthread_rwlock_unlock_multithreaded (LOCK) : 0)
-# define glthread_rwlock_destroy(LOCK) \
- (pthread_in_use () ? glthread_rwlock_destroy_multithreaded (LOCK) : 0)
-extern int glthread_rwlock_init_multithreaded (gl_rwlock_t *lock);
-extern int glthread_rwlock_rdlock_multithreaded (gl_rwlock_t *lock);
-extern int glthread_rwlock_wrlock_multithreaded (gl_rwlock_t *lock);
-extern int glthread_rwlock_unlock_multithreaded (gl_rwlock_t *lock);
-extern int glthread_rwlock_destroy_multithreaded (gl_rwlock_t *lock);
-
-# endif
-
-# else
-
-typedef struct
- {
- pthread_mutex_t lock; /* protects the remaining fields */
- pthread_cond_t waiting_readers; /* waiting readers */
- pthread_cond_t waiting_writers; /* waiting writers */
- unsigned int waiting_writers_count; /* number of waiting writers */
- int runcount; /* number of readers running, or -1 when a writer runs */
- }
- gl_rwlock_t;
-# define gl_rwlock_define(STORAGECLASS, NAME) \
- STORAGECLASS gl_rwlock_t NAME;
-# define gl_rwlock_define_initialized(STORAGECLASS, NAME) \
- STORAGECLASS gl_rwlock_t NAME = gl_rwlock_initializer;
-# define gl_rwlock_initializer \
- { PTHREAD_MUTEX_INITIALIZER, PTHREAD_COND_INITIALIZER, PTHREAD_COND_INITIALIZER, 0, 0 }
-# define glthread_rwlock_init(LOCK) \
- (pthread_in_use () ? glthread_rwlock_init_multithreaded (LOCK) : 0)
-# define glthread_rwlock_rdlock(LOCK) \
- (pthread_in_use () ? glthread_rwlock_rdlock_multithreaded (LOCK) : 0)
-# define glthread_rwlock_wrlock(LOCK) \
- (pthread_in_use () ? glthread_rwlock_wrlock_multithreaded (LOCK) : 0)
-# define glthread_rwlock_unlock(LOCK) \
- (pthread_in_use () ? glthread_rwlock_unlock_multithreaded (LOCK) : 0)
-# define glthread_rwlock_destroy(LOCK) \
- (pthread_in_use () ? glthread_rwlock_destroy_multithreaded (LOCK) : 0)
-extern int glthread_rwlock_init_multithreaded (gl_rwlock_t *lock);
-extern int glthread_rwlock_rdlock_multithreaded (gl_rwlock_t *lock);
-extern int glthread_rwlock_wrlock_multithreaded (gl_rwlock_t *lock);
-extern int glthread_rwlock_unlock_multithreaded (gl_rwlock_t *lock);
-extern int glthread_rwlock_destroy_multithreaded (gl_rwlock_t *lock);
-
-# endif
-
-/* --------------------- gl_recursive_lock_t datatype --------------------- */
-
-# if HAVE_PTHREAD_MUTEX_RECURSIVE
-
-# if defined PTHREAD_RECURSIVE_MUTEX_INITIALIZER || defined PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP
-
-typedef pthread_mutex_t gl_recursive_lock_t;
-# define gl_recursive_lock_define(STORAGECLASS, NAME) \
- STORAGECLASS pthread_mutex_t NAME;
-# define gl_recursive_lock_define_initialized(STORAGECLASS, NAME) \
- STORAGECLASS pthread_mutex_t NAME = gl_recursive_lock_initializer;
-# ifdef PTHREAD_RECURSIVE_MUTEX_INITIALIZER
-# define gl_recursive_lock_initializer \
- PTHREAD_RECURSIVE_MUTEX_INITIALIZER
-# else
-# define gl_recursive_lock_initializer \
- PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP
-# endif
-# define glthread_recursive_lock_init(LOCK) \
- (pthread_in_use () ? glthread_recursive_lock_init_multithreaded (LOCK) : 0)
-# define glthread_recursive_lock_lock(LOCK) \
- (pthread_in_use () ? pthread_mutex_lock (LOCK) : 0)
-# define glthread_recursive_lock_unlock(LOCK) \
- (pthread_in_use () ? pthread_mutex_unlock (LOCK) : 0)
-# define glthread_recursive_lock_destroy(LOCK) \
- (pthread_in_use () ? pthread_mutex_destroy (LOCK) : 0)
-extern int glthread_recursive_lock_init_multithreaded (gl_recursive_lock_t *lock);
-
-# else
-
-typedef struct
- {
- pthread_mutex_t recmutex; /* recursive mutex */
- pthread_mutex_t guard; /* protects the initialization */
- int initialized;
- }
- gl_recursive_lock_t;
-# define gl_recursive_lock_define(STORAGECLASS, NAME) \
- STORAGECLASS gl_recursive_lock_t NAME;
-# define gl_recursive_lock_define_initialized(STORAGECLASS, NAME) \
- STORAGECLASS gl_recursive_lock_t NAME = gl_recursive_lock_initializer;
-# define gl_recursive_lock_initializer \
- { PTHREAD_MUTEX_INITIALIZER, PTHREAD_MUTEX_INITIALIZER, 0 }
-# define glthread_recursive_lock_init(LOCK) \
- (pthread_in_use () ? glthread_recursive_lock_init_multithreaded (LOCK) : 0)
-# define glthread_recursive_lock_lock(LOCK) \
- (pthread_in_use () ? glthread_recursive_lock_lock_multithreaded (LOCK) : 0)
-# define glthread_recursive_lock_unlock(LOCK) \
- (pthread_in_use () ? glthread_recursive_lock_unlock_multithreaded (LOCK) : 0)
-# define glthread_recursive_lock_destroy(LOCK) \
- (pthread_in_use () ? glthread_recursive_lock_destroy_multithreaded (LOCK) : 0)
-extern int glthread_recursive_lock_init_multithreaded (gl_recursive_lock_t *lock);
-extern int glthread_recursive_lock_lock_multithreaded (gl_recursive_lock_t *lock);
-extern int glthread_recursive_lock_unlock_multithreaded (gl_recursive_lock_t *lock);
-extern int glthread_recursive_lock_destroy_multithreaded (gl_recursive_lock_t *lock);
-
-# endif
-
-# else
-
-/* Old versions of POSIX threads on Solaris did not have recursive locks.
- We have to implement them ourselves. */
-
-typedef struct
- {
- pthread_mutex_t mutex;
- pthread_t owner;
- unsigned long depth;
- }
- gl_recursive_lock_t;
-# define gl_recursive_lock_define(STORAGECLASS, NAME) \
- STORAGECLASS gl_recursive_lock_t NAME;
-# define gl_recursive_lock_define_initialized(STORAGECLASS, NAME) \
- STORAGECLASS gl_recursive_lock_t NAME = gl_recursive_lock_initializer;
-# define gl_recursive_lock_initializer \
- { PTHREAD_MUTEX_INITIALIZER, (pthread_t) 0, 0 }
-# define glthread_recursive_lock_init(LOCK) \
- (pthread_in_use () ? glthread_recursive_lock_init_multithreaded (LOCK) : 0)
-# define glthread_recursive_lock_lock(LOCK) \
- (pthread_in_use () ? glthread_recursive_lock_lock_multithreaded (LOCK) : 0)
-# define glthread_recursive_lock_unlock(LOCK) \
- (pthread_in_use () ? glthread_recursive_lock_unlock_multithreaded (LOCK) : 0)
-# define glthread_recursive_lock_destroy(LOCK) \
- (pthread_in_use () ? glthread_recursive_lock_destroy_multithreaded (LOCK) : 0)
-extern int glthread_recursive_lock_init_multithreaded (gl_recursive_lock_t *lock);
-extern int glthread_recursive_lock_lock_multithreaded (gl_recursive_lock_t *lock);
-extern int glthread_recursive_lock_unlock_multithreaded (gl_recursive_lock_t *lock);
-extern int glthread_recursive_lock_destroy_multithreaded (gl_recursive_lock_t *lock);
-
-# endif
-
-/* -------------------------- gl_once_t datatype -------------------------- */
-
-typedef pthread_once_t gl_once_t;
-# define gl_once_define(STORAGECLASS, NAME) \
- STORAGECLASS pthread_once_t NAME = PTHREAD_ONCE_INIT;
-# define glthread_once(ONCE_CONTROL, INITFUNCTION) \
- (pthread_in_use () \
- ? pthread_once (ONCE_CONTROL, INITFUNCTION) \
- : (glthread_once_singlethreaded (ONCE_CONTROL) ? (INITFUNCTION (), 0) : 0))
-extern int glthread_once_singlethreaded (pthread_once_t *once_control);
-
-# ifdef __cplusplus
-}
-# endif
-
-#endif
-
-/* ========================================================================= */
-
-#if USE_PTH_THREADS
-
-/* Use the GNU Pth threads library. */
-
-# include <pth.h>
-# include <stdlib.h>
-
-# ifdef __cplusplus
-extern "C" {
-# endif
-
-# if USE_PTH_THREADS_WEAK
-
-/* Use weak references to the GNU Pth threads library. */
-
-# pragma weak pth_mutex_init
-# pragma weak pth_mutex_acquire
-# pragma weak pth_mutex_release
-# pragma weak pth_rwlock_init
-# pragma weak pth_rwlock_acquire
-# pragma weak pth_rwlock_release
-# pragma weak pth_once
-
-# pragma weak pth_cancel
-# define pth_in_use() (pth_cancel != NULL)
-
-# else
-
-# define pth_in_use() 1
-
-# endif
-
-/* -------------------------- gl_lock_t datatype -------------------------- */
-
-typedef pth_mutex_t gl_lock_t;
-# define gl_lock_define(STORAGECLASS, NAME) \
- STORAGECLASS pth_mutex_t NAME;
-# define gl_lock_define_initialized(STORAGECLASS, NAME) \
- STORAGECLASS pth_mutex_t NAME = gl_lock_initializer;
-# define gl_lock_initializer \
- PTH_MUTEX_INIT
-# define glthread_lock_init(LOCK) \
- (pth_in_use() && !pth_mutex_init (LOCK) ? errno : 0)
-# define glthread_lock_lock(LOCK) \
- (pth_in_use() && !pth_mutex_acquire (LOCK, 0, NULL) ? errno : 0)
-# define glthread_lock_unlock(LOCK) \
- (pth_in_use() && !pth_mutex_release (LOCK) ? errno : 0)
-# define glthread_lock_destroy(LOCK) \
- ((void)(LOCK), 0)
-
-/* ------------------------- gl_rwlock_t datatype ------------------------- */
-
-typedef pth_rwlock_t gl_rwlock_t;
-# define gl_rwlock_define(STORAGECLASS, NAME) \
- STORAGECLASS pth_rwlock_t NAME;
-# define gl_rwlock_define_initialized(STORAGECLASS, NAME) \
- STORAGECLASS pth_rwlock_t NAME = gl_rwlock_initializer;
-# define gl_rwlock_initializer \
- PTH_RWLOCK_INIT
-# define glthread_rwlock_init(LOCK) \
- (pth_in_use() && !pth_rwlock_init (LOCK) ? errno : 0)
-# define glthread_rwlock_rdlock(LOCK) \
- (pth_in_use() && !pth_rwlock_acquire (LOCK, PTH_RWLOCK_RD, 0, NULL) ? errno : 0)
-# define glthread_rwlock_wrlock(LOCK) \
- (pth_in_use() && !pth_rwlock_acquire (LOCK, PTH_RWLOCK_RW, 0, NULL) ? errno : 0)
-# define glthread_rwlock_unlock(LOCK) \
- (pth_in_use() && !pth_rwlock_release (LOCK) ? errno : 0)
-# define glthread_rwlock_destroy(LOCK) \
- ((void)(LOCK), 0)
-
-/* --------------------- gl_recursive_lock_t datatype --------------------- */
-
-/* In Pth, mutexes are recursive by default. */
-typedef pth_mutex_t gl_recursive_lock_t;
-# define gl_recursive_lock_define(STORAGECLASS, NAME) \
- STORAGECLASS pth_mutex_t NAME;
-# define gl_recursive_lock_define_initialized(STORAGECLASS, NAME) \
- STORAGECLASS pth_mutex_t NAME = gl_recursive_lock_initializer;
-# define gl_recursive_lock_initializer \
- PTH_MUTEX_INIT
-# define glthread_recursive_lock_init(LOCK) \
- (pth_in_use() && !pth_mutex_init (LOCK) ? errno : 0)
-# define glthread_recursive_lock_lock(LOCK) \
- (pth_in_use() && !pth_mutex_acquire (LOCK, 0, NULL) ? errno : 0)
-# define glthread_recursive_lock_unlock(LOCK) \
- (pth_in_use() && !pth_mutex_release (LOCK) ? errno : 0)
-# define glthread_recursive_lock_destroy(LOCK) \
- ((void)(LOCK), 0)
-
-/* -------------------------- gl_once_t datatype -------------------------- */
-
-typedef pth_once_t gl_once_t;
-# define gl_once_define(STORAGECLASS, NAME) \
- STORAGECLASS pth_once_t NAME = PTH_ONCE_INIT;
-# define glthread_once(ONCE_CONTROL, INITFUNCTION) \
- (pth_in_use () \
- ? glthread_once_multithreaded (ONCE_CONTROL, INITFUNCTION) \
- : (glthread_once_singlethreaded (ONCE_CONTROL) ? (INITFUNCTION (), 0) : 0))
-extern int glthread_once_multithreaded (pth_once_t *once_control, void (*initfunction) (void));
-extern int glthread_once_singlethreaded (pth_once_t *once_control);
-
-# ifdef __cplusplus
-}
-# endif
-
-#endif
-
-/* ========================================================================= */
-
-#if USE_SOLARIS_THREADS
-
-/* Use the old Solaris threads library. */
-
-# include <thread.h>
-# include <synch.h>
-# include <stdlib.h>
-
-# ifdef __cplusplus
-extern "C" {
-# endif
-
-# if USE_SOLARIS_THREADS_WEAK
-
-/* Use weak references to the old Solaris threads library. */
-
-# pragma weak mutex_init
-# pragma weak mutex_lock
-# pragma weak mutex_unlock
-# pragma weak mutex_destroy
-# pragma weak rwlock_init
-# pragma weak rw_rdlock
-# pragma weak rw_wrlock
-# pragma weak rw_unlock
-# pragma weak rwlock_destroy
-# pragma weak thr_self
-
-# pragma weak thr_suspend
-# define thread_in_use() (thr_suspend != NULL)
-
-# else
-
-# define thread_in_use() 1
-
-# endif
-
-/* -------------------------- gl_lock_t datatype -------------------------- */
-
-typedef mutex_t gl_lock_t;
-# define gl_lock_define(STORAGECLASS, NAME) \
- STORAGECLASS mutex_t NAME;
-# define gl_lock_define_initialized(STORAGECLASS, NAME) \
- STORAGECLASS mutex_t NAME = gl_lock_initializer;
-# define gl_lock_initializer \
- DEFAULTMUTEX
-# define glthread_lock_init(LOCK) \
- (thread_in_use () ? mutex_init (LOCK, USYNC_THREAD, NULL) : 0)
-# define glthread_lock_lock(LOCK) \
- (thread_in_use () ? mutex_lock (LOCK) : 0)
-# define glthread_lock_unlock(LOCK) \
- (thread_in_use () ? mutex_unlock (LOCK) : 0)
-# define glthread_lock_destroy(LOCK) \
- (thread_in_use () ? mutex_destroy (LOCK) : 0)
-
-/* ------------------------- gl_rwlock_t datatype ------------------------- */
-
-typedef rwlock_t gl_rwlock_t;
-# define gl_rwlock_define(STORAGECLASS, NAME) \
- STORAGECLASS rwlock_t NAME;
-# define gl_rwlock_define_initialized(STORAGECLASS, NAME) \
- STORAGECLASS rwlock_t NAME = gl_rwlock_initializer;
-# define gl_rwlock_initializer \
- DEFAULTRWLOCK
-# define glthread_rwlock_init(LOCK) \
- (thread_in_use () ? rwlock_init (LOCK, USYNC_THREAD, NULL) : 0)
-# define glthread_rwlock_rdlock(LOCK) \
- (thread_in_use () ? rw_rdlock (LOCK) : 0)
-# define glthread_rwlock_wrlock(LOCK) \
- (thread_in_use () ? rw_wrlock (LOCK) : 0)
-# define glthread_rwlock_unlock(LOCK) \
- (thread_in_use () ? rw_unlock (LOCK) : 0)
-# define glthread_rwlock_destroy(LOCK) \
- (thread_in_use () ? rwlock_destroy (LOCK) : 0)
-
-/* --------------------- gl_recursive_lock_t datatype --------------------- */
-
-/* Old Solaris threads did not have recursive locks.
- We have to implement them ourselves. */
-
-typedef struct
- {
- mutex_t mutex;
- thread_t owner;
- unsigned long depth;
- }
- gl_recursive_lock_t;
-# define gl_recursive_lock_define(STORAGECLASS, NAME) \
- STORAGECLASS gl_recursive_lock_t NAME;
-# define gl_recursive_lock_define_initialized(STORAGECLASS, NAME) \
- STORAGECLASS gl_recursive_lock_t NAME = gl_recursive_lock_initializer;
-# define gl_recursive_lock_initializer \
- { DEFAULTMUTEX, (thread_t) 0, 0 }
-# define glthread_recursive_lock_init(LOCK) \
- do \
- { \
- if (thread_in_use ()) \
- glthread_recursive_lock_init_multithreaded (LOCK); \
- } \
- while (0)
-# define glthread_recursive_lock_lock(LOCK) \
- do \
- { \
- if (thread_in_use ()) \
- glthread_recursive_lock_lock_multithreaded (LOCK); \
- } \
- while (0)
-# define glthread_recursive_lock_unlock(LOCK) \
- do \
- { \
- if (thread_in_use ()) \
- glthread_recursive_lock_unlock_multithreaded (LOCK); \
- } \
- while (0)
-# define glthread_recursive_lock_destroy(LOCK) \
- do \
- { \
- if (thread_in_use ()) \
- glthread_recursive_lock_destroy_multithreaded (LOCK); \
- } \
- while (0)
-extern int glthread_recursive_lock_init_multithreaded (gl_recursive_lock_t *lock);
-extern int glthread_recursive_lock_lock_multithreaded (gl_recursive_lock_t *lock);
-extern int glthread_recursive_lock_unlock_multithreaded (gl_recursive_lock_t *lock);
-extern int glthread_recursive_lock_destroy_multithreaded (gl_recursive_lock_t *lock);
-
-/* -------------------------- gl_once_t datatype -------------------------- */
-
-typedef struct
- {
- volatile int inited;
- mutex_t mutex;
- }
- gl_once_t;
-# define gl_once_define(STORAGECLASS, NAME) \
- STORAGECLASS gl_once_t NAME = { 0, DEFAULTMUTEX };
-# define glthread_once(ONCE_CONTROL, INITFUNCTION) \
- (thread_in_use () \
- ? glthread_once_multithreaded (ONCE_CONTROL, INITFUNCTION) \
- : (glthread_once_singlethreaded (ONCE_CONTROL) ? (INITFUNCTION (), 0) : 0))
-extern int glthread_once_multithreaded (gl_once_t *once_control, void (*initfunction) (void));
-extern int glthread_once_singlethreaded (gl_once_t *once_control);
-
-# ifdef __cplusplus
-}
-# endif
-
-#endif
-
-/* ========================================================================= */
-
-#if USE_WIN32_THREADS
-
-# include <windows.h>
-
-# ifdef __cplusplus
-extern "C" {
-# endif
-
-/* We can use CRITICAL_SECTION directly, rather than the Win32 Event, Mutex,
- Semaphore types, because
- - we need only to synchronize inside a single process (address space),
- not inter-process locking,
- - we don't need to support trylock operations. (TryEnterCriticalSection
- does not work on Windows 95/98/ME. Packages that need trylock usually
- define their own mutex type.) */
-
-/* There is no way to statically initialize a CRITICAL_SECTION. It needs
- to be done lazily, once only. For this we need spinlocks. */
-
-typedef struct { volatile int done; volatile long started; } gl_spinlock_t;
-
-/* -------------------------- gl_lock_t datatype -------------------------- */
-
-typedef struct
- {
- gl_spinlock_t guard; /* protects the initialization */
- CRITICAL_SECTION lock;
- }
- gl_lock_t;
-# define gl_lock_define(STORAGECLASS, NAME) \
- STORAGECLASS gl_lock_t NAME;
-# define gl_lock_define_initialized(STORAGECLASS, NAME) \
- STORAGECLASS gl_lock_t NAME = gl_lock_initializer;
-# define gl_lock_initializer \
- { { 0, -1 } }
-# define glthread_lock_init(LOCK) \
- (glthread_lock_init_func (LOCK), 0)
-extern void glthread_lock_init_func (gl_lock_t *lock);
-extern int glthread_lock_lock (gl_lock_t *lock);
-extern int glthread_lock_unlock (gl_lock_t *lock);
-extern int glthread_lock_destroy (gl_lock_t *lock);
-
-/* ------------------------- gl_rwlock_t datatype ------------------------- */
-
-/* It is impossible to implement read-write locks using plain locks, without
- introducing an extra thread dedicated to managing read-write locks.
- Therefore here we need to use the low-level Event type. */
-
-typedef struct
- {
- HANDLE *array; /* array of waiting threads, each represented by an event */
- unsigned int count; /* number of waiting threads */
- unsigned int alloc; /* length of allocated array */
- unsigned int offset; /* index of first waiting thread in array */
- }
- gl_waitqueue_t;
-typedef struct
- {
- gl_spinlock_t guard; /* protects the initialization */
- CRITICAL_SECTION lock; /* protects the remaining fields */
- gl_waitqueue_t waiting_readers; /* waiting readers */
- gl_waitqueue_t waiting_writers; /* waiting writers */
- int runcount; /* number of readers running, or -1 when a writer runs */
- }
- gl_rwlock_t;
-# define gl_rwlock_define(STORAGECLASS, NAME) \
- STORAGECLASS gl_rwlock_t NAME;
-# define gl_rwlock_define_initialized(STORAGECLASS, NAME) \
- STORAGECLASS gl_rwlock_t NAME = gl_rwlock_initializer;
-# define gl_rwlock_initializer \
- { { 0, -1 } }
-# define glthread_rwlock_init(LOCK) \
- (glthread_rwlock_init_func (LOCK), 0)
-extern void glthread_rwlock_init_func (gl_rwlock_t *lock);
-extern int glthread_rwlock_rdlock (gl_rwlock_t *lock);
-extern int glthread_rwlock_wrlock (gl_rwlock_t *lock);
-extern int glthread_rwlock_unlock (gl_rwlock_t *lock);
-extern int glthread_rwlock_destroy (gl_rwlock_t *lock);
-
-/* --------------------- gl_recursive_lock_t datatype --------------------- */
-
-/* The Win32 documentation says that CRITICAL_SECTION already implements a
- recursive lock. But we need not rely on it: It's easy to implement a
- recursive lock without this assumption. */
-
-typedef struct
- {
- gl_spinlock_t guard; /* protects the initialization */
- DWORD owner;
- unsigned long depth;
- CRITICAL_SECTION lock;
- }
- gl_recursive_lock_t;
-# define gl_recursive_lock_define(STORAGECLASS, NAME) \
- STORAGECLASS gl_recursive_lock_t NAME;
-# define gl_recursive_lock_define_initialized(STORAGECLASS, NAME) \
- STORAGECLASS gl_recursive_lock_t NAME = gl_recursive_lock_initializer;
-# define gl_recursive_lock_initializer \
- { { 0, -1 }, 0, 0 }
-# define glthread_recursive_lock_init(LOCK) \
- (glthread_recursive_lock_init_func (LOCK), 0)
-extern void glthread_recursive_lock_init_func (gl_recursive_lock_t *lock);
-extern int glthread_recursive_lock_lock (gl_recursive_lock_t *lock);
-extern int glthread_recursive_lock_unlock (gl_recursive_lock_t *lock);
-extern int glthread_recursive_lock_destroy (gl_recursive_lock_t *lock);
-
-/* -------------------------- gl_once_t datatype -------------------------- */
-
-typedef struct
- {
- volatile int inited;
- volatile long started;
- CRITICAL_SECTION lock;
- }
- gl_once_t;
-# define gl_once_define(STORAGECLASS, NAME) \
- STORAGECLASS gl_once_t NAME = { -1, -1 };
-# define glthread_once(ONCE_CONTROL, INITFUNCTION) \
- (glthread_once_func (ONCE_CONTROL, INITFUNCTION), 0)
-extern void glthread_once_func (gl_once_t *once_control, void (*initfunction) (void));
-
-# ifdef __cplusplus
-}
-# endif
-
-#endif
-
-/* ========================================================================= */
-
-#if !(USE_POSIX_THREADS || USE_PTH_THREADS || USE_SOLARIS_THREADS || USE_WIN32_THREADS)
-
-/* Provide dummy implementation if threads are not supported. */
-
-/* -------------------------- gl_lock_t datatype -------------------------- */
-
-typedef int gl_lock_t;
-# define gl_lock_define(STORAGECLASS, NAME)
-# define gl_lock_define_initialized(STORAGECLASS, NAME)
-# define glthread_lock_init(NAME) 0
-# define glthread_lock_lock(NAME) 0
-# define glthread_lock_unlock(NAME) 0
-# define glthread_lock_destroy(NAME) 0
-
-/* ------------------------- gl_rwlock_t datatype ------------------------- */
-
-typedef int gl_rwlock_t;
-# define gl_rwlock_define(STORAGECLASS, NAME)
-# define gl_rwlock_define_initialized(STORAGECLASS, NAME)
-# define glthread_rwlock_init(NAME) 0
-# define glthread_rwlock_rdlock(NAME) 0
-# define glthread_rwlock_wrlock(NAME) 0
-# define glthread_rwlock_unlock(NAME) 0
-# define glthread_rwlock_destroy(NAME) 0
-
-/* --------------------- gl_recursive_lock_t datatype --------------------- */
-
-typedef int gl_recursive_lock_t;
-# define gl_recursive_lock_define(STORAGECLASS, NAME)
-# define gl_recursive_lock_define_initialized(STORAGECLASS, NAME)
-# define glthread_recursive_lock_init(NAME) 0
-# define glthread_recursive_lock_lock(NAME) 0
-# define glthread_recursive_lock_unlock(NAME) 0
-# define glthread_recursive_lock_destroy(NAME) 0
-
-/* -------------------------- gl_once_t datatype -------------------------- */
-
-typedef int gl_once_t;
-# define gl_once_define(STORAGECLASS, NAME) \
- STORAGECLASS gl_once_t NAME = 0;
-# define glthread_once(ONCE_CONTROL, INITFUNCTION) \
- (*(ONCE_CONTROL) == 0 ? (*(ONCE_CONTROL) = ~ 0, INITFUNCTION (), 0) : 0)
-
-#endif
-
-/* ========================================================================= */
-
-/* Macros with built-in error handling. */
-
-/* -------------------------- gl_lock_t datatype -------------------------- */
-
-#define gl_lock_init(NAME) \
- do \
- { \
- if (glthread_lock_init (&NAME)) \
- abort (); \
- } \
- while (0)
-#define gl_lock_lock(NAME) \
- do \
- { \
- if (glthread_lock_lock (&NAME)) \
- abort (); \
- } \
- while (0)
-#define gl_lock_unlock(NAME) \
- do \
- { \
- if (glthread_lock_unlock (&NAME)) \
- abort (); \
- } \
- while (0)
-#define gl_lock_destroy(NAME) \
- do \
- { \
- if (glthread_lock_destroy (&NAME)) \
- abort (); \
- } \
- while (0)
-
-/* ------------------------- gl_rwlock_t datatype ------------------------- */
-
-#define gl_rwlock_init(NAME) \
- do \
- { \
- if (glthread_rwlock_init (&NAME)) \
- abort (); \
- } \
- while (0)
-#define gl_rwlock_rdlock(NAME) \
- do \
- { \
- if (glthread_rwlock_rdlock (&NAME)) \
- abort (); \
- } \
- while (0)
-#define gl_rwlock_wrlock(NAME) \
- do \
- { \
- if (glthread_rwlock_wrlock (&NAME)) \
- abort (); \
- } \
- while (0)
-#define gl_rwlock_unlock(NAME) \
- do \
- { \
- if (glthread_rwlock_unlock (&NAME)) \
- abort (); \
- } \
- while (0)
-#define gl_rwlock_destroy(NAME) \
- do \
- { \
- if (glthread_rwlock_destroy (&NAME)) \
- abort (); \
- } \
- while (0)
-
-/* --------------------- gl_recursive_lock_t datatype --------------------- */
-
-#define gl_recursive_lock_init(NAME) \
- do \
- { \
- if (glthread_recursive_lock_init (&NAME)) \
- abort (); \
- } \
- while (0)
-#define gl_recursive_lock_lock(NAME) \
- do \
- { \
- if (glthread_recursive_lock_lock (&NAME)) \
- abort (); \
- } \
- while (0)
-#define gl_recursive_lock_unlock(NAME) \
- do \
- { \
- if (glthread_recursive_lock_unlock (&NAME)) \
- abort (); \
- } \
- while (0)
-#define gl_recursive_lock_destroy(NAME) \
- do \
- { \
- if (glthread_recursive_lock_destroy (&NAME)) \
- abort (); \
- } \
- while (0)
-
-/* -------------------------- gl_once_t datatype -------------------------- */
-
-#define gl_once(NAME, INITFUNCTION) \
- do \
- { \
- if (glthread_once (&NAME, INITFUNCTION)) \
- abort (); \
- } \
- while (0)
-
-/* ========================================================================= */
-
-#endif /* _LOCK_H */
#ifdef _LIBC
# include <bits/libc-lock.h>
#else /* !_LIBC */
-# include "lock.h"
-# include "tls.h"
+# include "glthread/lock.h"
+# include "glthread/tls.h"
# define __libc_once_define(CLASS, NAME) gl_once_define (CLASS, NAME)
# define __libc_once(NAME, INIT) gl_once ((NAME), (INIT))
# define __libc_key_t gl_tls_key_t
+++ /dev/null
-/* Thread-local storage in multithreaded situations.
- Copyright (C) 2005-2008 Free Software Foundation, Inc.
-
- This program is free software: you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 3 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>. */
-
-/* Written by Bruno Haible <bruno@clisp.org>, 2005. */
-
-#include <config.h>
-
-#include "tls.h"
-
-/* ========================================================================= */
-
-#if USE_POSIX_THREADS
-
-#endif
-
-/* ========================================================================= */
-
-#if USE_PTH_THREADS
-
-#endif
-
-/* ========================================================================= */
-
-#if USE_SOLARIS_THREADS
-
-/* Use the old Solaris threads library. */
-
-/* ------------------------- gl_tls_key_t datatype ------------------------- */
-
-void *
-glthread_tls_get_multithreaded (thread_key_t key)
-{
- void *value;
-
- if (thr_getspecific (key, &value) != 0)
- abort ();
- return value;
-}
-
-#endif
-
-/* ========================================================================= */
-
-#if USE_WIN32_THREADS
-
-#endif
-
-/* ========================================================================= */
+++ /dev/null
-/* Thread-local storage in multithreaded situations.
- Copyright (C) 2005, 2007-2008 Free Software Foundation, Inc.
-
- This program is free software: you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 3 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>. */
-
-/* Written by Bruno Haible <bruno@clisp.org>, 2005. */
-
-/* This file contains thread-local storage primitives for use with a given
- thread library. It does not contain primitives for creating threads or
- for other multithreading primitives.
-
- Type: gl_tls_key_t
- Initialization: gl_tls_key_init (name, destructor);
- Getting per-thread value: gl_tls_get (name)
- Setting per-thread value: gl_tls_set (name, pointer);
- De-initialization: gl_tls_key_destroy (name);
- Equivalent functions with control of error handling:
- Initialization: err = glthread_tls_key_init (&name, destructor);
- Setting per-thread value: err = glthread_tls_set (&name, pointer);
- De-initialization: err = glthread_tls_key_destroy (&name);
-
- A per-thread value is of type 'void *'.
-
- A destructor is a function pointer of type 'void (*) (void *)', called
- when a thread exits, and taking the last per-thread value as argument. It
- is unspecified whether the destructor function is called when the last
- per-thread value is NULL. On some platforms, the destructor function is
- not called at all.
-*/
-
-
-#ifndef _TLS_H
-#define _TLS_H
-
-#include <errno.h>
-
-/* ========================================================================= */
-
-#if USE_POSIX_THREADS
-
-/* Use the POSIX threads library. */
-
-# include <pthread.h>
-# include <stdlib.h>
-
-# if PTHREAD_IN_USE_DETECTION_HARD
-
-/* The pthread_in_use() detection needs to be done at runtime. */
-# define pthread_in_use() \
- glthread_in_use ()
-extern int glthread_in_use (void);
-
-# endif
-
-# if USE_POSIX_THREADS_WEAK
-
-/* Use weak references to the POSIX threads library. */
-
-# pragma weak pthread_key_create
-# pragma weak pthread_getspecific
-# pragma weak pthread_setspecific
-# pragma weak pthread_key_delete
-# ifndef pthread_self
-# pragma weak pthread_self
-# endif
-
-# if !PTHREAD_IN_USE_DETECTION_HARD
-# pragma weak pthread_cancel
-# define pthread_in_use() (pthread_cancel != NULL)
-# endif
-
-# else
-
-# if !PTHREAD_IN_USE_DETECTION_HARD
-# define pthread_in_use() 1
-# endif
-
-# endif
-
-/* ------------------------- gl_tls_key_t datatype ------------------------- */
-
-typedef union
- {
- void *singlethread_value;
- pthread_key_t key;
- }
- gl_tls_key_t;
-# define glthread_tls_key_init(KEY, DESTRUCTOR) \
- (pthread_in_use () \
- ? pthread_key_create (&(KEY)->key, DESTRUCTOR) \
- : ((KEY)->singlethread_value = NULL, 0))
-# define gl_tls_get(NAME) \
- (pthread_in_use () \
- ? pthread_getspecific ((NAME).key) \
- : (NAME).singlethread_value)
-# define glthread_tls_set(KEY, POINTER) \
- (pthread_in_use () \
- ? pthread_setspecific ((KEY)->key, (POINTER)) \
- : ((KEY)->singlethread_value = (POINTER), 0))
-# define glthread_tls_key_destroy(KEY) \
- (pthread_in_use () ? pthread_key_delete ((KEY)->key) : 0)
-
-#endif
-
-/* ========================================================================= */
-
-#if USE_PTH_THREADS
-
-/* Use the GNU Pth threads library. */
-
-# include <pth.h>
-# include <stdlib.h>
-
-# if USE_PTH_THREADS_WEAK
-
-/* Use weak references to the GNU Pth threads library. */
-
-# pragma weak pth_key_create
-# pragma weak pth_key_getdata
-# pragma weak pth_key_setdata
-# pragma weak pth_key_delete
-
-# pragma weak pth_cancel
-# define pth_in_use() (pth_cancel != NULL)
-
-# else
-
-# define pth_in_use() 1
-
-# endif
-
-/* ------------------------- gl_tls_key_t datatype ------------------------- */
-
-typedef union
- {
- void *singlethread_value;
- pth_key_t key;
- }
- gl_tls_key_t;
-# define glthread_tls_key_init(KEY, DESTRUCTOR) \
- (pth_in_use () \
- ? (!pth_key_create (&(KEY)->key, DESTRUCTOR) ? errno : 0) \
- : ((KEY)->singlethread_value = NULL, 0))
-# define gl_tls_get(NAME) \
- (pth_in_use () \
- ? pth_key_getdata ((NAME).key) \
- : (NAME).singlethread_value)
-# define glthread_tls_set(KEY, POINTER) \
- (pth_in_use () \
- ? (!pth_key_setdata ((KEY)->key, (POINTER)) ? errno : 0) \
- : ((KEY)->singlethread_value = (POINTER), 0))
-# define glthread_tls_key_destroy(KEY) \
- (pth_in_use () \
- ? (!pth_key_delete ((KEY)->key) ? errno : 0) \
- : 0)
-
-#endif
-
-/* ========================================================================= */
-
-#if USE_SOLARIS_THREADS
-
-/* Use the old Solaris threads library. */
-
-# include <thread.h>
-# include <stdlib.h>
-
-# if USE_SOLARIS_THREADS_WEAK
-
-/* Use weak references to the old Solaris threads library. */
-
-# pragma weak thr_keycreate
-# pragma weak thr_getspecific
-# pragma weak thr_setspecific
-
-# pragma weak thr_suspend
-# define thread_in_use() (thr_suspend != NULL)
-
-# else
-
-# define thread_in_use() 1
-
-# endif
-
-/* ------------------------- gl_tls_key_t datatype ------------------------- */
-
-typedef union
- {
- void *singlethread_value;
- thread_key_t key;
- }
- gl_tls_key_t;
-# define glthread_tls_key_init(KEY, DESTRUCTOR) \
- (thread_in_use () \
- ? thr_keycreate (&(KEY)->key, DESTRUCTOR) \
- : ((KEY)->singlethread_value = NULL, 0))
-# define gl_tls_get(NAME) \
- (thread_in_use () \
- ? glthread_tls_get_multithreaded ((NAME).key) \
- : (NAME).singlethread_value)
-extern void *glthread_tls_get_multithreaded (thread_key_t key);
-# define glthread_tls_set(KEY, POINTER) \
- (thread_in_use () \
- ? thr_setspecific ((KEY)->key, (POINTER)) \
- : ((KEY)->singlethread_value = (POINTER), 0))
-# define glthread_tls_key_destroy(KEY) \
- /* Unsupported. */ \
- 0
-
-#endif
-
-/* ========================================================================= */
-
-#if USE_WIN32_THREADS
-
-# include <windows.h>
-
-/* ------------------------- gl_tls_key_t datatype ------------------------- */
-
-typedef DWORD gl_tls_key_t;
-# define glthread_tls_key_init(KEY, DESTRUCTOR) \
- /* The destructor is unsupported. */ \
- ((*(KEY) = TlsAlloc ()) == (DWORD)-1 ? EAGAIN : ((void) (DESTRUCTOR), 0))
-# define gl_tls_get(NAME) \
- TlsGetValue (NAME)
-# define glthread_tls_set(KEY, POINTER) \
- (!TlsSetValue (*(KEY), POINTER) ? EINVAL : 0)
-# define glthread_tls_key_destroy(KEY) \
- (!TlsFree (*(KEY)) ? EINVAL : 0)
-
-#endif
-
-/* ========================================================================= */
-
-#if !(USE_POSIX_THREADS || USE_PTH_THREADS || USE_SOLARIS_THREADS || USE_WIN32_THREADS)
-
-/* Provide dummy implementation if threads are not supported. */
-
-/* ------------------------- gl_tls_key_t datatype ------------------------- */
-
-typedef struct
- {
- void *singlethread_value;
- }
- gl_tls_key_t;
-# define glthread_tls_key_init(KEY, DESTRUCTOR) \
- ((KEY)->singlethread_value = NULL, \
- (void) (DESTRUCTOR), \
- 0)
-# define gl_tls_get(NAME) \
- (NAME).singlethread_value
-# define glthread_tls_set(KEY, POINTER) \
- ((KEY)->singlethread_value = (POINTER), 0)
-# define glthread_tls_key_destroy(KEY) \
- 0
-
-#endif
-
-/* ========================================================================= */
-
-/* Macros with built-in error handling. */
-
-/* ------------------------- gl_tls_key_t datatype ------------------------- */
-
-#define gl_tls_key_init(NAME, DESTRUCTOR) \
- do \
- { \
- if (glthread_tls_key_init (&NAME, DESTRUCTOR)) \
- abort (); \
- } \
- while (0)
-#define gl_tls_set(NAME, POINTER) \
- do \
- { \
- if (glthread_tls_set (&NAME, POINTER)) \
- abort (); \
- } \
- while (0)
-#define gl_tls_key_destroy(NAME) \
- do \
- { \
- if (glthread_tls_key_destroy (&NAME)) \
- abort (); \
- } \
- while (0)
-
-/* ========================================================================= */
-
-#endif /* _TLS_H */
Locking in multithreaded situations.
Files:
-lib/lock.h
-lib/lock.c
+lib/glthread/lock.h
+lib/glthread/lock.c
m4/lock.m4
build-aux/config.rpath
gl_LOCK
Makefile.am:
-lib_SOURCES += lock.h lock.c
+lib_SOURCES += glthread/lock.h glthread/lock.c
Include:
-"lock.h"
+"glthread/lock.h"
Link:
$(LTLIBTHREAD) when linking with libtool, $(LIBTHREAD) otherwise
Thread-local storage in multithreaded situations.
Files:
-lib/tls.h
-lib/tls.c
+lib/glthread/tls.h
+lib/glthread/tls.c
m4/tls.m4
Depends-on:
gl_TLS
Makefile.am:
-lib_SOURCES += tls.h tls.c
+lib_SOURCES += glthread/tls.h glthread/tls.c
Include:
-"tls.h"
+"glthread/tls.h"
License:
LGPLv2+
/* Test of locking in multithreaded situations.
- Copyright (C) 2005 Free Software Foundation, Inc.
+ Copyright (C) 2005, 2008 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
# undef USE_PTH_THREADS
# undef USE_WIN32_THREADS
#endif
-#include "lock.h"
+#include "glthread/lock.h"
#if ENABLE_DEBUGGING
# define dbgprintf printf
/* Test of thread-local storage in multithreaded situations.
- Copyright (C) 2005 Free Software Foundation, Inc.
+ Copyright (C) 2005, 2008 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
#include <stdlib.h>
#include <string.h>
-#include "tls.h"
+#include "glthread/tls.h"
#if ENABLE_DEBUGGING
# define dbgprintf printf
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