_pthread_mutex_destroy
_pthread_mutex_destroy(&dirp->dd_lock);
#define pthread_mutex_destroy _pthread_mutex_destroy
#define _MUTEX_DESTROY(x) if (__isthreaded) _pthread_mutex_destroy(x)
STATIC_LIB_REQUIRE(_pthread_mutex_destroy);
STATIC_LIB_REQUIRE(_pthread_mutex_destroy);
__weak_reference(_thr_mutex_destroy, _pthread_mutex_destroy);