-/* PSPP - computes sample statistics.
- Copyright (C) 1997-9, 2000, 2006 Free Software Foundation, Inc.
+/* PSPP - a program for statistical analysis.
+ Copyright (C) 1997-9, 2000, 2006, 2009 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 of the
- License, or (at your option) any later version.
+ 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.
+ 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. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include <config.h>
#include <stdlib.h>
#include <string.h>
-#include <libpspp/alloc.h>
#include <libpspp/compiler.h>
-#include <libpspp/magic.h>
+#include <libpspp/hash.h>
+#include <libpspp/ll.h>
#include <libpspp/message.h>
#include <libpspp/str.h>
#include <data/file-name.h>
#include <data/variable.h>
#include <data/scratch-handle.h>
+#include "xalloc.h"
+
#include "gettext.h"
#define _(msgid) gettext (msgid)
-/* (headers) */
-
/* File handle. */
-struct file_handle
+struct file_handle
{
- struct file_handle *next; /* Next in global list. */
- int open_cnt; /* 0=not open, otherwise # of openers. */
- bool deleted; /* Destroy handle when open_cnt goes to 0? */
-
- char id[LONG_NAME_LEN + 1]; /* Identifier token; empty string if none. */
+ struct ll ll; /* Element in global list. */
+ size_t ref_cnt; /* Number of references. */
+ char *id; /* Identifier token, NULL if none. */
char *name; /* User-friendly identifying name. */
- const char *type; /* If open, type of file. */
- char open_mode[3]; /* "[rw][se]". */
- void *aux; /* Aux data pointer for owner if any. */
enum fh_referent referent; /* What the file handle refers to. */
/* FH_REF_FILE only. */
char *file_name; /* File name as provided by user. */
- struct file_identity *identity; /* For checking file identity. */
enum fh_mode mode; /* File mode. */
+ const char *encoding; /* File encoding. */
/* FH_REF_FILE and FH_REF_INLINE only. */
size_t record_width; /* Length of fixed-format records. */
struct scratch_handle *sh; /* Scratch file data. */
};
-/* List of all handles. */
-static struct file_handle *file_handles;
+static struct file_handle *
+file_handle_from_ll (struct ll *ll)
+{
+ return ll_data (ll, struct file_handle, ll);
+}
+
+/* List of all named handles. */
+static struct ll_list named_handles;
/* Default file handle for DATA LIST, REREAD, REPEATING DATA
commands. */
static struct file_handle *inline_file;
static struct file_handle *create_handle (const char *id,
- const char *name, enum fh_referent);
+ char *name, enum fh_referent);
+static void free_handle (struct file_handle *);
+static void unname_handle (struct file_handle *);
/* File handle initialization routine. */
-void
+void
fh_init (void)
{
- inline_file = create_handle ("INLINE", "INLINE", FH_REF_INLINE);
+ ll_init (&named_handles);
+ inline_file = create_handle ("INLINE", xstrdup ("INLINE"), FH_REF_INLINE);
inline_file->record_width = 80;
inline_file->tab_width = 8;
}
+/* Removes all named file handles from the global list. */
+void
+fh_done (void)
+{
+ while (!ll_is_empty (&named_handles))
+ unname_handle (file_handle_from_ll (ll_head (&named_handles)));
+}
+
/* Free HANDLE and remove it from the global list. */
static void
-free_handle (struct file_handle *handle)
+free_handle (struct file_handle *handle)
{
/* Remove handle from global list. */
- if (file_handles == handle)
- file_handles = handle->next;
- else
- {
- struct file_handle *iter = file_handles;
- while (iter->next != handle)
- iter = iter->next;
- iter->next = handle->next;
- }
+ if (handle->id != NULL)
+ ll_remove (&handle->ll);
/* Free data. */
+ free (handle->id);
free (handle->name);
free (handle->file_name);
- fn_free_identity (handle->identity);
scratch_handle_destroy (handle->sh);
free (handle);
}
-/* Frees all the file handles. */
-void
-fh_done (void)
+/* Make HANDLE unnamed, so that it can no longer be referenced by
+ name. The caller must hold a reference to HANDLE, which is
+ not affected by this function. */
+static void
+unname_handle (struct file_handle *handle)
{
- while (file_handles != NULL)
- free_handle (file_handles);
+ assert (handle->id != NULL);
+ free (handle->id);
+ handle->id = NULL;
+ ll_remove (&handle->ll);
+
+ /* Drop the reference held by the named_handles table. */
+ fh_unref (handle);
}
-/* Returns the handle with the given ID, or a null pointer if
- there is none. */
+/* Increments HANDLE's reference count and returns HANDLE. */
struct file_handle *
-fh_from_id (const char *id)
+fh_ref (struct file_handle *handle)
{
- struct file_handle *iter;
-
- for (iter = file_handles; iter != NULL; iter = iter->next)
- if (!iter->deleted && !strcasecmp (id, iter->id))
- return iter;
- return NULL;
+ assert (handle->ref_cnt > 0);
+ handle->ref_cnt++;
+ return handle;
}
-/* Returns the handle for the file named FILE_NAME,
- or a null pointer if none exists.
- Different names for the same file (e.g. "x" and "./x") are
- considered equivalent. */
-struct file_handle *
-fh_from_file_name (const char *file_name)
-{
- struct file_identity *identity;
- struct file_handle *iter;
-
- /* First check for a file with the same identity. */
- identity = fn_get_identity (file_name);
- if (identity != NULL)
+/* Decrements HANDLE's reference count.
+ If the reference count drops to 0, HANDLE is destroyed. */
+void
+fh_unref (struct file_handle *handle)
+{
+ if (handle != NULL)
{
- for (iter = file_handles; iter != NULL; iter = iter->next)
- if (!iter->deleted
- && iter->referent == FH_REF_FILE
- && iter->identity != NULL
- && !fn_compare_file_identities (identity, iter->identity))
- {
- fn_free_identity (identity);
- return iter;
- }
- fn_free_identity (identity);
+ assert (handle->ref_cnt > 0);
+ if (--handle->ref_cnt == 0)
+ free_handle (handle);
}
+}
- /* Then check for a file with the same name. */
- for (iter = file_handles; iter != NULL; iter = iter->next)
- if (!iter->deleted
- && iter->referent == FH_REF_FILE && !strcmp (file_name, iter->file_name))
- return iter;
+/* Make HANDLE unnamed, so that it can no longer be referenced by
+ name. The caller must hold a reference to HANDLE, which is
+ not affected by this function.
+
+ This function ignores a null pointer as input. It has no
+ effect on the inline handle, which is always named INLINE.*/
+void
+fh_unname (struct file_handle *handle)
+{
+ assert (handle->ref_cnt > 1);
+ if (handle != fh_inline_file () && handle->id != NULL)
+ unname_handle (handle);
+}
+
+/* Returns the handle with the given ID, or a null pointer if
+ there is none. */
+struct file_handle *
+fh_from_id (const char *id)
+{
+ struct file_handle *handle;
+
+ ll_for_each (handle, struct file_handle, ll, &named_handles)
+ if (!strcasecmp (id, handle->id))
+ {
+ handle->ref_cnt++;
+ return handle;
+ }
return NULL;
}
The new handle is not fully initialized. The caller is
responsible for completing its initialization. */
static struct file_handle *
-create_handle (const char *id, const char *handle_name,
- enum fh_referent referent)
+create_handle (const char *id, char *handle_name, enum fh_referent referent)
{
struct file_handle *handle = xzalloc (sizeof *handle);
- assert (id == NULL || fh_from_id (id) == NULL);
- handle->next = file_handles;
- handle->open_cnt = 0;
- handle->deleted = false;
- str_copy_trunc (handle->id, sizeof handle->id, id != NULL ? id : "");
- handle->name = xstrdup (handle_name);
- handle->type = NULL;
- handle->aux = NULL;
+
+ handle->ref_cnt = 1;
+ handle->id = id != NULL ? xstrdup (id) : NULL;
+ handle->name = handle_name;
handle->referent = referent;
- file_handles = handle;
+
+ if (id != NULL)
+ {
+ assert (fh_from_id (id) == NULL);
+ ll_push_tail (&named_handles, &handle->ll);
+ handle->ref_cnt++;
+ }
+
return handle;
}
which refers to the "inline file" that represents character
data in the command file between BEGIN DATA and END DATA. */
struct file_handle *
-fh_inline_file (void)
+fh_inline_file (void)
{
+ fh_ref (inline_file);
return inline_file;
}
-/* Creates a new file handle with the given ID, which may be
- null. If it is non-null, it must be unique among existing
- file identifiers. The new handle is associated with file
- FILE_NAME and the given PROPERTIES. */
+/* Creates and returns a new file handle with the given ID, which
+ may be null. If it is non-null, it must be unique among
+ existing file identifiers. The new handle is associated with
+ file FILE_NAME and the given PROPERTIES. */
struct file_handle *
fh_create_file (const char *id, const char *file_name,
const struct fh_properties *properties)
char *handle_name;
struct file_handle *handle;
- handle_name = id != NULL ? (char *) id : xasprintf ("\"%s\"", file_name);
+ handle_name = id != NULL ? xstrdup (id) : xasprintf ("\"%s\"", file_name);
handle = create_handle (id, handle_name, FH_REF_FILE);
- if (id == NULL)
- free (handle_name);
handle->file_name = xstrdup (file_name);
- handle->identity = fn_get_identity (file_name);
handle->mode = properties->mode;
handle->record_width = properties->record_width;
handle->tab_width = properties->tab_width;
+ handle->encoding = properties->encoding;
return handle;
}
unique among existing file identifiers. The new handle is
associated with a scratch file (initially empty). */
struct file_handle *
-fh_create_scratch (const char *id)
+fh_create_scratch (const char *id)
{
struct file_handle *handle;
- assert (id != NULL);
- handle = create_handle (id, id, FH_REF_SCRATCH);
+ handle = create_handle (id, xstrdup (id), FH_REF_SCRATCH);
handle->sh = NULL;
return handle;
}
fh_default_properties (void)
{
static const struct fh_properties default_properties
- = {FH_MODE_TEXT, 1024, 4};
+ = {FH_MODE_TEXT, 1024, 4, LEGACY_NATIVE};
return &default_properties;
}
-/* Deletes FH from the global list of file handles. Afterward,
- attempts to search for it will fail. Unless the file handle
- is currently open, it will be destroyed; otherwise, it will be
- destroyed later when it is closed.
- Normally needed only if a file_handle needs to be re-assigned.
- Otherwise, just let fh_done() destroy the handle. */
-void
-fh_free (struct file_handle *handle)
-{
- if (handle == fh_inline_file () || handle == NULL || handle->deleted)
- return;
- handle->deleted = true;
-
- if (handle == default_handle)
- default_handle = fh_inline_file ();
-
- if (handle->open_cnt == 0)
- free_handle (handle);
-}
-
-/* Returns an English description of MODE,
- which is in the format of the MODE argument to fh_open(). */
-static const char *
-mode_name (const char *mode)
-{
- assert (mode != NULL);
- assert (mode[0] == 'r' || mode[0] == 'w');
-
- return mode[0] == 'r' ? "reading" : "writing";
-}
-
-/* Tries to open handle H with the given TYPE and MODE.
-
- H's referent type must be one of the bits in MASK. The caller
- must verify this ahead of time; we simply assert it here.
-
- TYPE is the sort of file, e.g. "system file". Only one given
- type of access is allowed on a given file handle at once.
- If successful, a reference to TYPE is retained, so it should
- probably be a string literal.
-
- MODE combines the read or write mode with the sharing mode.
- The first character is 'r' for read, 'w' for write. The
- second character is 's' to permit sharing, 'e' to require
- exclusive access.
-
- Returns the address of a void * that the caller can use for
- data specific to the file handle if successful, or a null
- pointer on failure. For exclusive access modes the void *
- will always be a null pointer at return. In shared access
- modes the void * will necessarily be null only if no other
- sharers are active. */
-void **
-fh_open (struct file_handle *h, enum fh_referent mask UNUSED,
- const char *type, const char *mode)
-{
- assert (h != NULL);
- assert ((fh_get_referent (h) & mask) != 0);
- assert (type != NULL);
- assert (mode != NULL);
- assert (mode[0] == 'r' || mode[0] == 'w');
- assert (mode[1] == 's' || mode[1] == 'e');
- assert (mode[2] == '\0');
-
- if (h->open_cnt != 0)
- {
- if (strcmp (h->type, type))
- {
- msg (SE, _("Can't open %s as a %s because it is "
- "already open as a %s."),
- fh_get_name (h), type, h->type);
- return NULL;
- }
- else if (strcmp (h->open_mode, mode))
- {
- msg (SE, _("Can't open %s as a %s for %s because it is "
- "already open for %s."),
- fh_get_name (h), type, mode_name (mode),
- mode_name (h->open_mode));
- return NULL;
- }
- else if (h->open_mode[1] == 'e')
- {
- msg (SE, _("Can't re-open %s as a %s for %s."),
- fh_get_name (h), type, mode_name (mode));
- return NULL;
- }
- }
- else
- {
- h->type = type;
- strcpy (h->open_mode, mode);
- assert (h->aux == NULL);
- }
- h->open_cnt++;
-
- return &h->aux;
-}
-
-/* Closes file handle H, which must have been open for the
- specified TYPE and MODE of access provided to fh_open().
- Returns zero if the file is now closed, nonzero if it is still
- open due to another reference.
-
- After fh_close() returns zero for a handle, it is unsafe to
- reference that file handle again in any way, because its
- storage may have been freed. */
-int
-fh_close (struct file_handle *h, const char *type, const char *mode)
-{
- assert (h != NULL);
- assert (h->open_cnt > 0);
- assert (type != NULL);
- assert (!strcmp (type, h->type));
- assert (mode != NULL);
- assert (!strcmp (mode, h->open_mode));
-
- if (--h->open_cnt == 0)
- {
- h->type = NULL;
- h->aux = NULL;
- if (h->deleted)
- free_handle (h);
- return 0;
- }
- return 1;
-}
-
-/* Is the file open? BEGIN DATA...END DATA uses this to detect
- whether the inline file is actually in use. */
-bool
-fh_is_open (const struct file_handle *handle)
-{
- return handle->open_cnt > 0;
-}
-
/* Returns the identifier that may be used in syntax to name the
given HANDLE, which takes the form of a PSPP identifier. If
HANDLE has no identifier, returns a null pointer.
Return value is owned by the file handle.*/
const char *
-fh_get_id (const struct file_handle *handle)
+fh_get_id (const struct file_handle *handle)
{
- return handle->id[0] != '\0' ? handle->id : NULL;
+ return handle->id;
}
/* Returns a user-friendly string to identify the given HANDLE.
/* Returns the type of object that HANDLE refers to. */
enum fh_referent
-fh_get_referent (const struct file_handle *handle)
+fh_get_referent (const struct file_handle *handle)
{
return handle->referent;
}
/* Returns the name of the file associated with HANDLE. */
const char *
-fh_get_file_name (const struct file_handle *handle)
+fh_get_file_name (const struct file_handle *handle)
{
assert (handle->referent == FH_REF_FILE);
return handle->file_name;
/* Returns the mode of HANDLE. */
enum fh_mode
-fh_get_mode (const struct file_handle *handle)
+fh_get_mode (const struct file_handle *handle)
{
assert (handle->referent == FH_REF_FILE);
return handle->mode;
zero if tabs are not to be expanded. Applicable only to
FH_MODE_TEXT files. */
size_t
-fh_get_tab_width (const struct file_handle *handle)
+fh_get_tab_width (const struct file_handle *handle)
{
assert (handle->referent & (FH_REF_FILE | FH_REF_INLINE));
return handle->tab_width;
}
+/* Returns the encoding of characters read from HANDLE. */
+const char *
+fh_get_legacy_encoding (const struct file_handle *handle)
+{
+ assert (handle->referent & (FH_REF_FILE | FH_REF_INLINE));
+ return (handle->referent == FH_REF_FILE ? handle->encoding : LEGACY_NATIVE);
+}
+
/* Returns the scratch file handle associated with HANDLE.
Applicable to only FH_REF_SCRATCH files. */
struct scratch_handle *
-fh_get_scratch_handle (struct file_handle *handle)
+fh_get_scratch_handle (const struct file_handle *handle)
{
assert (handle->referent == FH_REF_SCRATCH);
return handle->sh;
/* Returns the current default handle. */
struct file_handle *
-fh_get_default_handle (void)
+fh_get_default_handle (void)
{
- return default_handle ? default_handle : fh_inline_file ();
+ return default_handle ? fh_ref (default_handle) : fh_inline_file ();
}
/* Sets NEW_DEFAULT_HANDLE as the default handle. */
void
-fh_set_default_handle (struct file_handle *new_default_handle)
+fh_set_default_handle (struct file_handle *new_default_handle)
{
assert (new_default_handle == NULL
|| (new_default_handle->referent & (FH_REF_INLINE | FH_REF_FILE)));
+ if (default_handle != NULL)
+ fh_unref (default_handle);
default_handle = new_default_handle;
+ if (default_handle != NULL)
+ fh_ref (default_handle);
+}
+\f
+/* Information about a file handle's readers or writers. */
+struct fh_lock
+ {
+ /* Hash key. */
+ enum fh_referent referent; /* Type of underlying file. */
+ union
+ {
+ struct file_identity *file; /* FH_REF_FILE only. */
+ unsigned int unique_id; /* FH_REF_SCRATCH only. */
+ }
+ u;
+ enum fh_access access; /* Type of file access. */
+
+ /* Number of openers. */
+ size_t open_cnt;
+
+ /* Applicable only when open_cnt > 0. */
+ bool exclusive; /* No other openers allowed? */
+ const char *type; /* Human-readable type of file. */
+ void *aux; /* Owner's auxiliary data. */
+ };
+
+/* Hash table of all active locks. */
+static struct hsh_table *locks;
+
+static void make_key (struct fh_lock *, const struct file_handle *,
+ enum fh_access);
+static void free_key (struct fh_lock *);
+static int compare_fh_locks (const void *, const void *, const void *);
+static unsigned int hash_fh_lock (const void *, const void *);
+
+/* Tries to lock handle H for the given kind of ACCESS and TYPE
+ of file. Returns a pointer to a struct fh_lock if successful,
+ otherwise a null pointer.
+
+ H's referent type must be one of the bits in MASK. The caller
+ must verify this ahead of time; we simply assert it here.
+
+ TYPE is the sort of file, e.g. "system file". Only one type
+ of access is allowed on a given file at a time for reading,
+ and similarly for writing. If successful, a reference to TYPE
+ is retained, so it should probably be a string literal.
+
+ TYPE should be marked with N_() in the caller: that is, the
+ caller should not translate it with gettext, but fh_lock will
+ do so.
+
+ ACCESS specifies whether the lock is for reading or writing.
+ EXCLUSIVE is true to require exclusive access, false to allow
+ sharing with other accessors. Exclusive read access precludes
+ other readers, but not writers; exclusive write access
+ precludes other writers, but not readers. A sharable read or
+ write lock precludes reader or writers, respectively, of a
+ different TYPE.
+
+ A lock may be associated with auxiliary data. See
+ fh_lock_get_aux and fh_lock_set_aux for more details. */
+struct fh_lock *
+fh_lock (struct file_handle *h, enum fh_referent mask UNUSED,
+ const char *type, enum fh_access access, bool exclusive)
+{
+ struct fh_lock key, *lock;
+ void **lockp;
+
+ assert ((fh_get_referent (h) & mask) != 0);
+ assert (access == FH_ACC_READ || access == FH_ACC_WRITE);
+
+ if (locks == NULL)
+ locks = hsh_create (0, compare_fh_locks, hash_fh_lock, NULL, NULL);
+
+ make_key (&key, h, access);
+ lockp = hsh_probe (locks, &key);
+ if (*lockp == NULL)
+ {
+ lock = *lockp = xmalloc (sizeof *lock);
+ *lock = key;
+ lock->open_cnt = 1;
+ lock->exclusive = exclusive;
+ lock->type = type;
+ lock->aux = NULL;
+ }
+ else
+ {
+ free_key (&key);
+
+ lock = *lockp;
+ if (strcmp (lock->type, type))
+ {
+ if (access == FH_ACC_READ)
+ msg (SE, _("Can't read from %s as a %s because it is "
+ "already being read as a %s."),
+ fh_get_name (h), gettext (type), gettext (lock->type));
+ else
+ msg (SE, _("Can't write to %s as a %s because it is "
+ "already being written as a %s."),
+ fh_get_name (h), gettext (type), gettext (lock->type));
+ return NULL;
+ }
+ else if (exclusive || lock->exclusive)
+ {
+ msg (SE, _("Can't re-open %s as a %s."),
+ fh_get_name (h), gettext (type));
+ return NULL;
+ }
+ lock->open_cnt++;
+ }
+
+ return lock;
+}
+
+/* Releases LOCK that was acquired with fh_lock.
+ Returns true if LOCK is still locked, because other clients
+ also had it locked.
+
+ Returns false if LOCK has now been destroyed. In this case
+ the caller must ensure that any auxiliary data associated with
+ LOCK is destroyed, to avoid a memory leak. The caller must
+ obtain a pointer to the auxiliary data, e.g. via
+ fh_lock_get_aux *before* calling fh_unlock (because it yields
+ undefined behavior to call fh_lock_get_aux on a destroyed
+ lock). */
+bool
+fh_unlock (struct fh_lock *lock)
+{
+ if (lock != NULL)
+ {
+ assert (lock->open_cnt > 0);
+ if (--lock->open_cnt == 0)
+ {
+ hsh_delete (locks, lock);
+ free_key (lock);
+ free (lock);
+ return false;
+ }
+ }
+ return true;
+}
+
+/* Returns auxiliary data for LOCK.
+
+ Auxiliary data is shared by every client that holds LOCK (for
+ an exclusive lock, this is a single client). To avoid leaks,
+ auxiliary data must be released before LOCK is destroyed. */
+void *
+fh_lock_get_aux (const struct fh_lock *lock)
+{
+ return lock->aux;
+}
+
+/* Sets the auxiliary data for LOCK to AUX. */
+void
+fh_lock_set_aux (struct fh_lock *lock, void *aux)
+{
+ lock->aux = aux;
+}
+
+/* Returns true if HANDLE is locked for the given type of ACCESS,
+ false otherwise. */
+bool
+fh_is_locked (const struct file_handle *handle, enum fh_access access)
+{
+ struct fh_lock key;
+ bool is_locked;
+
+ make_key (&key, handle, access);
+ is_locked = hsh_find (locks, &key) != NULL;
+ free_key (&key);
+
+ return is_locked;
+}
+
+/* Initializes the key fields in LOCK for looking up or inserting
+ handle H for the given kind of ACCESS. */
+static void
+make_key (struct fh_lock *lock, const struct file_handle *h,
+ enum fh_access access)
+{
+ lock->referent = fh_get_referent (h);
+ lock->access = access;
+ if (lock->referent == FH_REF_FILE)
+ lock->u.file = fn_get_identity (fh_get_file_name (h));
+ else if (lock->referent == FH_REF_SCRATCH)
+ {
+ struct scratch_handle *sh = fh_get_scratch_handle (h);
+ lock->u.unique_id = sh != NULL ? sh->unique_id : 0;
+ }
+}
+
+/* Frees the key fields in LOCK. */
+static void
+free_key (struct fh_lock *lock)
+{
+ if (lock->referent == FH_REF_FILE)
+ fn_free_identity (lock->u.file);
+}
+
+/* Compares the key fields in struct fh_lock objects A and B and
+ returns a strcmp()-type result. */
+static int
+compare_fh_locks (const void *a_, const void *b_, const void *aux UNUSED)
+{
+ const struct fh_lock *a = a_;
+ const struct fh_lock *b = b_;
+
+ if (a->referent != b->referent)
+ return a->referent < b->referent ? -1 : 1;
+ else if (a->access != b->access)
+ return a->access < b->access ? -1 : 1;
+ else if (a->referent == FH_REF_FILE)
+ return fn_compare_file_identities (a->u.file, b->u.file);
+ else if (a->referent == FH_REF_SCRATCH)
+ return (a->u.unique_id < b->u.unique_id ? -1
+ : a->u.unique_id > b->u.unique_id);
+ else
+ return 0;
+}
+
+/* Returns a hash value for LOCK. */
+static unsigned int
+hash_fh_lock (const void *lock_, const void *aux UNUSED)
+{
+ const struct fh_lock *lock = lock_;
+ unsigned int basis;
+ if (lock->referent == FH_REF_FILE)
+ basis = fn_hash_identity (lock->u.file);
+ else if (lock->referent == FH_REF_SCRATCH)
+ basis = lock->u.unique_id;
+ else
+ basis = 0;
+ return hash_int ((lock->referent << 3) | lock->access, basis);
}
projects / pspp-builds.git / blobdiff