1#include "pthread_impl.h" 2 3int __pthread_mutex_timedlock(pthread_mutex_t *restrict m, const struct timespec *restrict at) 4{ 5 if ((m->_m_type&15) == PTHREAD_MUTEX_NORMAL 6 && !a_cas(&m->_m_lock, 0, EBUSY)) 7 return 0; 8 9 int r, t, priv = (m->_m_type & 128) ^ 128; 10 11 r = pthread_mutex_trylock(m); 12 if (r != EBUSY) return r; 13 14 int spins = 100; 15 while (spins-- && m->_m_lock && !m->_m_waiters) a_spin(); 16 17 while ((r=pthread_mutex_trylock(m)) == EBUSY) { 18 if (!(r=m->_m_lock) || ((r&0x40000000) && (m->_m_type&4))) 19 continue; 20 if ((m->_m_type&3) == PTHREAD_MUTEX_ERRORCHECK 21 && (r&0x7fffffff) == __pthread_self()->tid) 22 return EDEADLK; 23 24 a_inc(&m->_m_waiters); 25 t = r | 0x80000000; 26 a_cas(&m->_m_lock, r, t); 27 r = __timedwait(&m->_m_lock, t, CLOCK_REALTIME, at, priv); 28 a_dec(&m->_m_waiters); 29 if (r && r != EINTR) break; 30 } 31 return r; 32} 33 34weak_alias(__pthread_mutex_timedlock, pthread_mutex_timedlock); 35