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