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, t;
   6
   7         if (m->_m_type == PTHREAD_MUTEX_NORMAL && !a_cas(&m->_m_lock, 0, EBUSY))
   8                 return 0;
   9
  10         while ((r=pthread_mutex_trylock(m)) == EBUSY) {
  11                 if (!(r=m->_m_lock) || (r&0x40000000)) continue;
  12                 if ((m->_m_type&3) == PTHREAD_MUTEX_ERRORCHECK
  13                  && (r&0x1fffffff) == pthread_self()->tid)
  14                         return EDEADLK;
  15
  16                 a_inc(&m->_m_waiters);
  17                 t = r | 0x80000000;
  18                 a_cas(&m->_m_lock, r, t);
  19                 r = __timedwait(&m->_m_lock, t, CLOCK_REALTIME, at, 0, 0, 0);
  20                 a_dec(&m->_m_waiters);
  21                 if (r && r != EINTR) break;
  22         }
  23         return r;
  24 }