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avoid crash on stupid but allowable usage of pthread_mutex_unlock

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unlocking an unlocked mutex is not UB for robust or error-checking
mutexes, so we must avoid calling __pthread_self (which might crash
due to lack of thread-register initialization) until after checking
that the mutex is locked.
This commit is contained in:
Rich Felker 2011-03-30 10:32:45 -04:00
parent 620a134638
commit a1eb8cb5da
1 changed files with 3 additions and 1 deletions
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4
src/thread/pthread_mutex_unlock.c
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@ -5,9 +5,11 @@ int pthread_mutex_unlock(pthread_mutex_t *m)
pthread_t self;
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;
return EPERM;
if ((m->_m_type&3) == PTHREAD_MUTEX_RECURSIVE && --m->_m_count)
return 0;
if (m->_m_type >= 4) {