+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