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| | #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, 0, 0, priv);
a_dec(&m->_m_waiters);
if (r && r != EINTR) break;
}
return r;
}
|