about summary refs log tree commit diff
path: root/src/thread/pthread_mutex_unlock.c
blob: fdf9fc103ffd857c69c93658265fe86e006a01d9 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
#include "pthread_impl.h"

int pthread_mutex_unlock(pthread_mutex_t *m)
{
	pthread_t self;
	int waiters = m->_m_waiters;
	int cont;
	int robust = 0;

	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 m->_m_count--, 0;
		if (m->_m_type >= 4) {
			robust = 1;
			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);
	if (robust)
		self->robust_list.pending = 0;
	if (waiters || cont<0)
		__wake(&m->_m_lock, 1, 0);
	return 0;
}