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cheap trick to further optimize locking normal mutexes

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This commit is contained in:
Rich Felker
2011-04-14 14:39:57 -04:00
parent 016a5dc192
commit ec2e50d0d7
2 changed files with 2 additions and 2 deletions
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2
src/thread/pthread_mutex_lock.c
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@ -4,7 +4,7 @@ int pthread_mutex_lock(pthread_mutex_t *m)
{ {
int r; int r;
if (m->_m_type == PTHREAD_MUTEX_NORMAL && !a_swap(&m->_m_lock, 1)) if (m->_m_type == PTHREAD_MUTEX_NORMAL && !a_swap(&m->_m_lock, EBUSY))
return 0; return 0;
while ((r=pthread_mutex_trylock(m)) == EBUSY) { while ((r=pthread_mutex_trylock(m)) == EBUSY) {

2
src/thread/pthread_mutex_trylock.c
View File

@ -7,7 +7,7 @@ int pthread_mutex_trylock(pthread_mutex_t *m)
pthread_t self; pthread_t self;
if (m->_m_type == PTHREAD_MUTEX_NORMAL) if (m->_m_type == PTHREAD_MUTEX_NORMAL)
return -a_swap(&m->_m_lock, 1) & EBUSY; return a_swap(&m->_m_lock, EBUSY);
self = pthread_self(); self = pthread_self();
tid = self->tid | 0x80000000; tid = self->tid | 0x80000000;