_pthread_cond_init
#define pthread_cond_init _pthread_cond_init
#define cond_init(c, a, p) _pthread_cond_init(c, a)
__strong_reference(_pthread_cond_init, pthread_cond_init);
STATIC_LIB_REQUIRE(_pthread_cond_init);
ret = _pthread_cond_init(&prwlock->write_signal, NULL);
ret = _pthread_cond_init(&prwlock->read_signal, NULL);