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#include "pthread_impl.h"
int pthread_mutex_unlock(pthread_mutex_t *m)
{
pthread_t self;
int waiters = m->_m_waiters;
int cont;
if (m->_m_type != PTHREAD_MUTEX_NORMAL) {
if (!m->_m_lock)
return EPERM;
self = __pthread_self();
if ((m->_m_lock&0x1fffffff) != self->tid)
return EPERM;
if ((m->_m_type&3) == PTHREAD_MUTEX_RECURSIVE && --m->_m_count)
return 0;
if (m->_m_type >= 4) {
self->robust_list.pending = &m->_m_next;
*(void **)m->_m_prev = m->_m_next;
if (m->_m_next) ((void **)m->_m_next)[-1] = m->_m_prev;
cont = a_swap(&m->_m_lock, 0);
self->robust_list.pending = 0;
goto wake;
}
}
cont = a_swap(&m->_m_lock, 0);
wake:
if (waiters || cont<0)
__wake(&m->_m_lock, 1, 0);
return 0;
}
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