53 lines
1.3 KiB
C
53 lines
1.3 KiB
C
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#include "pthread_impl.h"
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int __pthread_mutex_unlock(pthread_mutex_t *m)
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{
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pthread_t self;
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int waiters = m->_m_waiters;
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int cont;
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int type = m->_m_type & 15;
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int priv = (m->_m_type & 128) ^ 128;
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int new = 0;
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int old;
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if (type != PTHREAD_MUTEX_NORMAL) {
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self = __pthread_self();
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old = m->_m_lock;
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int own = old & 0x3fffffff;
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if (own != self->tid)
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return EPERM;
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if ((type&3) == PTHREAD_MUTEX_RECURSIVE && m->_m_count)
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return m->_m_count--, 0;
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if ((type&4) && (old&0x40000000))
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new = 0x7fffffff;
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if (!priv) {
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self->robust_list.pending = &m->_m_next;
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__vm_lock();
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}
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volatile void *prev = m->_m_prev;
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volatile void *next = m->_m_next;
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*(volatile void *volatile *)prev = next;
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if (next != &self->robust_list.head) *(volatile void *volatile *)
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((char *)next - sizeof(void *)) = prev;
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}
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if (type&8) {
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if (old<0 || a_cas(&m->_m_lock, old, new)!=old) {
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if (new) a_store(&m->_m_waiters, -1);
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__syscall(SYS_futex, &m->_m_lock, FUTEX_UNLOCK_PI|priv);
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}
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cont = 0;
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waiters = 0;
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} else {
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cont = a_swap(&m->_m_lock, new);
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}
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if (type != PTHREAD_MUTEX_NORMAL && !priv) {
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self->robust_list.pending = 0;
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__vm_unlock();
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}
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if (waiters || cont<0)
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__wake(&m->_m_lock, 1, priv);
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return 0;
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}
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weak_alias(__pthread_mutex_unlock, pthread_mutex_unlock);
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