ref: f6fe1a93aa38f1bc72630d8514cacfb86f33e18b
dir: /libnpe_pthread/pthread_cond_wait.c/
#include "_pthread.h" int pthread_cond_wait(pthread_cond_t *const cond, pthread_mutex_t *const mutex) { qlock(cond->l); qunlock(mutex); rsleep(cond); qunlock(cond->l); qlock(mutex); return 0; }