pthread: add to system <pthread.h> instead of replacing it all, for MacOS

[pspp] / ChangeLog

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+2010-09-22  Paul Eggert  <eggert@cs.ucla.edu>
+
+       * lib/pthread.in.h: Add split double-inclusion guard, and include
+       system <pthread.h> if there is one.  Use @@-style as in other
+       .in.h files.  Define PTHREAD_COND_INITIALIZER etc. only if system
+       pthread.h doesn't.
+       (pthread_mutexattr_destroy, pthread_mutexattr_init):
+       (pthread_mutexattr_settype, pthread_mutex_trylock):
+       New static inline functions, if there's no system <pthread.h>.
+       (pthread_spinlock_t, pthread_spin_init, pthread_spin_destroy):
+       (pthread_spin_lock, pthread_spin_trylock, pthread_spin_unlock):
+       Approximate with mutexes if the system lacks spinlocks, as in
+       MacOS.
+       * m4/pthread.m4 (gl_PTHREAD_CHECK): Require gl_PTHREAD_DEFAULTS.
+       Add gl_CHECK_NEXT_HEADERS for pthread.h, and support the usual
+       @@-style.  Check for spinlocks separately.
+       (gl_PTHREAD_DEFAULTS): New macro.
+       * modules/pthread: Redo to use a more typical style for in.h files.
+
 2010-09-21  Eric Blake  <eblake@redhat.com>
 
        net_if: enhance tests