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

   1 #include "pthread_impl.h"
   2
   3 int pthread_mutex_unlock(pthread_mutex_t *m)
   4 {
   5         if (m->_m_type == PTHREAD_MUTEX_RECURSIVE) {
   6                 if (a_fetch_add(&m->_m_lock, -1)==1 && m->_m_waiters)
   7                         __wake(&m->_m_lock, 1, 0);
   8                 return 0;
   9         }
  10
  11         if (m->_m_type == PTHREAD_MUTEX_ERRORCHECK
  12          && m->_m_owner != pthread_self()->tid)
  13                 return EPERM;
  14
  15         m->_m_owner = 0;
  16         m->_m_lock = 0;
  17         if (m->_m_waiters) __wake(&m->_m_lock, 1, 0);
  18         return 0;
  19 }