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#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 type = m->_m_type & 15;
int priv = (m->_m_type & 128) ^ 128;
if (type != PTHREAD_MUTEX_NORMAL) {
self = __pthread_self();
if ((m->_m_lock&0x7fffffff) != self->tid)
return EPERM;
if ((type&3) == PTHREAD_MUTEX_RECURSIVE && m->_m_count)
return m->_m_count--, 0;
if (!priv) {
self->robust_list.pending = &m->_m_next;
__vm_lock_impl(+1);
}
volatile void *prev = m->_m_prev;
volatile void *next = m->_m_next;
*(volatile void *volatile *)prev = next;
if (next != &self->robust_list.head) *(volatile void *volatile *)
((char *)next - sizeof(void *)) = prev;
}
cont = a_swap(&m->_m_lock, (type & 8) ? 0x40000000 : 0);
if (type != PTHREAD_MUTEX_NORMAL && !priv) {
self->robust_list.pending = 0;
__vm_unlock_impl();
}
if (waiters || cont<0)
__wake(&m->_m_lock, 1, priv);
return 0;
}
weak_alias(__pthread_mutex_unlock, pthread_mutex_unlock);
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