musl/src/thread/pthread_mutex_unlock.c

#include "pthread_impl.h"

int pthread_mutex_unlock(pthread_mutex_t *m)
{
	if (m->_m_type != PTHREAD_MUTEX_NORMAL) {
		if (!m->_m_lock || m->_m_lock != __pthread_self()->tid)
		 	return EPERM;
		if (m->_m_type == PTHREAD_MUTEX_RECURSIVE && --m->_m_count)
			return 0;
	}

	m->_m_lock = 0;
	if (m->_m_waiters) __wake(&m->_m_lock, 1, 0);
	return 0;
}
initial check-in, version 0.5.0 2011-02-12 00:22:29 -05:00			`#include "pthread_impl.h"`

			`int pthread_mutex_unlock(pthread_mutex_t *m)`
			`{`
fix and optimize non-default-type mutex behavior problem 1: mutex type from the attribute was being ignored by pthread_mutex_init, so recursive/errorchecking mutexes were never being used at all. problem 2: ownership of recursive mutexes was not being enforced at unlock time. 2011-03-08 03:41:05 -05:00			`if (m->_m_type != PTHREAD_MUTEX_NORMAL) {`
avoid function call to pthread_self in mutex unlock if the mutex was previously locked, we can assume pthread_self was already called at the time of locking, and thus that the thread pointer is initialized. 2011-03-17 13:35:08 -04:00			`if (!m->_m_lock \|\| m->_m_lock != __pthread_self()->tid)`
fix and optimize non-default-type mutex behavior problem 1: mutex type from the attribute was being ignored by pthread_mutex_init, so recursive/errorchecking mutexes were never being used at all. problem 2: ownership of recursive mutexes was not being enforced at unlock time. 2011-03-08 03:41:05 -05:00			`return EPERM;`
			`if (m->_m_type == PTHREAD_MUTEX_RECURSIVE && --m->_m_count)`
			`return 0;`
initial check-in, version 0.5.0 2011-02-12 00:22:29 -05:00			`}`

reorganize pthread data structures and move the definitions to alltypes.h this allows sys/types.h to provide the pthread types, as required by POSIX. this design also facilitates forcing ABI-compatible sizes in the arch-specific alltypes.h, while eliminating the need for developers changing the internals of the pthread types to poke around with arch-specific headers they may not be able to test. 2011-02-17 17:16:20 -05:00			`m->_m_lock = 0;`
			`if (m->_m_waiters) __wake(&m->_m_lock, 1, 0);`
initial check-in, version 0.5.0 2011-02-12 00:22:29 -05:00			`return 0;`
			`}`