_thr_cond_signal
__weak_reference(_thr_cond_signal, pthread_cond_signal);
__weak_reference(_thr_cond_signal, _pthread_cond_signal);
[PJT_COND_SIGNAL] = {DUAL_ENTRY(_thr_cond_signal)},
int _thr_cond_signal(pthread_cond_t * cond);