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#include "pthread_impl.h"
int pthread_mutex_trylock(pthread_mutex_t *m)
{
if (m->_m_type == PTHREAD_MUTEX_RECURSIVE) {
pthread_t self = pthread_self();
if (m->_m_owner == self->tid) {
if ((unsigned)m->_m_lock >= INT_MAX) return EAGAIN;
a_inc(&m->_m_lock);
return 0;
}
if (a_fetch_add(&m->_m_lock, 1)) {
if (a_fetch_add(&m->_m_lock, -1)==1 && m->_m_waiters)
__wake(&m->_m_lock, 1, 0);
return EBUSY;
}
m->_m_owner = self->tid;
return 0;
}
if (a_xchg(&m->_m_lock, 1))
if (m->_m_type == PTHREAD_MUTEX_ERRORCHECK
&& m->_m_owner == pthread_self()->tid) return EDEADLK;
else return EBUSY;
if (m->_m_type == PTHREAD_MUTEX_ERRORCHECK)
m->_m_owner = pthread_self()->tid;
return 0;
}
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