| #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; |
| int type = m->_m_type & 15; |
| int priv = (m->_m_type & 128) ^ 128; |
| |
| if (type != PTHREAD_MUTEX_NORMAL) { |
| if (!m->_m_lock) |
| return EPERM; |
| self = __pthread_self(); |
| if ((m->_m_lock&0x1fffffff) != self->tid) |
| return EPERM; |
| if ((type&3) == PTHREAD_MUTEX_RECURSIVE && m->_m_count) |
| return m->_m_count--, 0; |
| if (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, priv); |
| return 0; |
| } |