ngx_cond_wait    1250 os/unix/ngx_process_cycle.c         if (ngx_cond_wait(thr->cv, ngx_posted_events_mutex) == NGX_ERROR) {
ngx_cond_wait     105 os/unix/ngx_thread.h ngx_int_t ngx_cond_wait(ngx_cond_t *cv, ngx_mutex_t *m);