nsz Git - musl/blob - src/thread/pthread_mutex_timedlock.c

   1 #include "pthread_impl.h"
   2
   3 int pthread_mutex_timedlock(pthread_mutex_t *m, const struct timespec *at)
   4 {
   5         int r, w=0;
   6         while ((r=pthread_mutex_trylock(m)) == EBUSY) {
   7                 if (!(r=m->_m_lock) || (r&0x40000000)) continue;
   8                 if (!w) a_inc(&m->_m_waiters), w++;
   9                 if (__timedwait(&m->_m_lock, r, CLOCK_REALTIME, at, 0) == ETIMEDOUT) {
  10                         if (w) a_dec(&m->_m_waiters);
  11                         return ETIMEDOUT;
  12                 }
  13         }
  14         if (w) a_dec(&m->_m_waiters);
  15         return r;
  16 }