+/* Typically, __gthrw_foo is a weak reference to symbol foo. */
+#define __gthrw(name) __gthrw2(__gthrw_ ## name,name,name)
+
+/* On Tru64, /usr/include/pthread.h uses #pragma extern_prefix "__" to
+ map a subset of the POSIX pthread API to mangled versions of their
+ names. */
+#if defined(__osf__) && defined(_PTHREAD_USE_MANGLED_NAMES_)
+#define __gthrw3(name) __gthrw2(__gthrw_ ## name, __ ## name, name)
+__gthrw3(pthread_once)
+__gthrw3(pthread_getspecific)
+__gthrw3(pthread_setspecific)
+
+__gthrw3(pthread_create)
+__gthrw3(pthread_join)
+__gthrw3(pthread_detach)
+__gthrw3(pthread_equal)
+__gthrw3(pthread_self)
+__gthrw3(pthread_cancel)
+__gthrw3(sched_yield)
+
+__gthrw3(pthread_mutex_lock)
+__gthrw3(pthread_mutex_trylock)
+#ifdef _POSIX_TIMEOUTS
+#if _POSIX_TIMEOUTS >= 0
+__gthrw3(pthread_mutex_timedlock)
+#endif
+#endif /* _POSIX_TIMEOUTS */
+__gthrw3(pthread_mutex_unlock)
+__gthrw3(pthread_mutex_init)
+__gthrw3(pthread_mutex_destroy)
+
+__gthrw3(pthread_cond_broadcast)
+__gthrw3(pthread_cond_signal)
+__gthrw3(pthread_cond_wait)
+__gthrw3(pthread_cond_timedwait)
+__gthrw3(pthread_cond_destroy)
+#else
+__gthrw(pthread_once)
+__gthrw(pthread_getspecific)
+__gthrw(pthread_setspecific)
+
+__gthrw(pthread_create)
+__gthrw(pthread_join)
+__gthrw(pthread_equal)
+__gthrw(pthread_self)
+__gthrw(pthread_detach)
+__gthrw(pthread_cancel)
+__gthrw(sched_yield)
+
+__gthrw(pthread_mutex_lock)
+__gthrw(pthread_mutex_trylock)
+#ifdef _POSIX_TIMEOUTS
+#if _POSIX_TIMEOUTS >= 0
+__gthrw(pthread_mutex_timedlock)
+#endif
+#endif /* _POSIX_TIMEOUTS */
+__gthrw(pthread_mutex_unlock)
+__gthrw(pthread_mutex_init)
+__gthrw(pthread_mutex_destroy)
+
+__gthrw(pthread_cond_broadcast)
+__gthrw(pthread_cond_signal)
+__gthrw(pthread_cond_wait)
+__gthrw(pthread_cond_timedwait)
+__gthrw(pthread_cond_destroy)
+#endif
+
+__gthrw(pthread_key_create)
+__gthrw(pthread_key_delete)
+__gthrw(pthread_mutexattr_init)
+__gthrw(pthread_mutexattr_settype)
+__gthrw(pthread_mutexattr_destroy)