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simplify robust mutex unlock code path 

right now it's questionable whether this change is an improvement or
not, but if we later want to support priority inheritance mutexes, it
will be important to have the code paths unified like this to avoid
major code duplication.
This commit is contained in:
Rich Felker 2011-10-03 00:19:05 -04:00
parent b8688ff875
commit b6f9974ad8
1 changed files with 4 additions and 4 deletions
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8
src/thread/pthread_mutex_unlock.c
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@ -5,6 +5,7 @@ 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)
@ -15,16 +16,15 @@ int pthread_mutex_unlock(pthread_mutex_t *m)
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);
self->robust_list.pending = 0;
goto wake;
}
}
cont = a_swap(&m->_m_lock, 0);
wake:
if (robust)
self->robust_list.pending = 0;
if (waiters || cont<0)
__wake(&m->_m_lock, 1, 0);
return 0;