| #include "pthread_impl.h" |
| |
| int __pthread_mutex_timedlock(pthread_mutex_t *restrict m, const struct timespec *restrict at) |
| { |
| if ((m->_m_type&15) == PTHREAD_MUTEX_NORMAL |
| && !a_cas(&m->_m_lock, 0, EBUSY)) |
| return 0; |
| |
| int r, t, priv = (m->_m_type & 128) ^ 128; |
| |
| r = pthread_mutex_trylock(m); |
| if (r != EBUSY) return r; |
| |
| int spins = 100; |
| while (spins-- && m->_m_lock && !m->_m_waiters) a_spin(); |
| |
| while ((r=pthread_mutex_trylock(m)) == EBUSY) { |
| if (!(r=m->_m_lock) || ((r&0x40000000) && (m->_m_type&4))) |
| continue; |
| if ((m->_m_type&3) == PTHREAD_MUTEX_ERRORCHECK |
| && (r&0x7fffffff) == __pthread_self()->tid) |
| return EDEADLK; |
| |
| a_inc(&m->_m_waiters); |
| t = r | 0x80000000; |
| a_cas(&m->_m_lock, r, t); |
| r = __timedwait(&m->_m_lock, t, CLOCK_REALTIME, at, priv); |
| a_dec(&m->_m_waiters); |
| if (r && r != EINTR) break; |
| } |
| return r; |
| } |
| |
| weak_alias(__pthread_mutex_timedlock, pthread_mutex_timedlock); |
