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

   1 #include "pthread_impl.h"
   2
   3 int pthread_mutex_lock(pthread_mutex_t *m)
   4 {
   5         int r;
   6
   7         if (m->_m_type == PTHREAD_MUTEX_NORMAL && !a_swap(&m->_m_lock, 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                 __wait(&m->_m_lock, &m->_m_waiters, r, 0);
  16         }
  17         return r;
  18 }