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
32
33
34
35
36
37
38
39
| | #include "pthread_impl.h"
void __vm_lock_impl(int);
void __vm_unlock_impl(void);
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;
__vm_lock_impl(+1);
}
}
cont = a_swap(&m->_m_lock, 0);
if (robust) {
self->robust_list.pending = 0;
__vm_unlock_impl();
}
if (waiters || cont<0)
__wake(&m->_m_lock, 1, 0);
return 0;
}
weak_alias(__pthread_mutex_unlock, pthread_mutex_unlock);
|