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37 lines
938 B
37 lines
938 B
#include "pthread_impl.h"
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int __pthread_mutex_timedlock(pthread_mutex_t *restrict m, const struct timespec *restrict at)
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{
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if ((m->_m_type&15) == PTHREAD_MUTEX_NORMAL
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&& !a_cas(&m->_m_lock, 0, EBUSY))
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return 0;
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int type = m->_m_type;
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int r, t, priv = (type & 128) ^ 128;
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r = pthread_mutex_trylock(m);
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if (r != EBUSY) return r;
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int spins = 100;
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while (spins-- && m->_m_lock && !m->_m_waiters) a_spin();
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while ((r=__pthread_mutex_trylock(m)) == EBUSY) {
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r = m->_m_lock;
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int own = r & 0x3fffffff;
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if (!own && (!r || (type&4)))
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continue;
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if ((type&3) == PTHREAD_MUTEX_ERRORCHECK
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&& own == __pthread_self()->tid)
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return EDEADLK;
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a_inc(&m->_m_waiters);
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t = r | 0x80000000;
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a_cas(&m->_m_lock, r, t);
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r = __timedwait(&m->_m_lock, t, CLOCK_REALTIME, at, priv);
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a_dec(&m->_m_waiters);
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if (r && r != EINTR) break;
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}
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return r;
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}
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weak_alias(__pthread_mutex_timedlock, pthread_mutex_timedlock);
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