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optimize spinlock spin
[musl]
/
src
/
thread
/
pthread_mutex_lock.c
diff --git
a/src/thread/pthread_mutex_lock.c
b/src/thread/pthread_mutex_lock.c
index
8255614
..
477b3d8
100644
(file)
--- a/
src/thread/pthread_mutex_lock.c
+++ b/
src/thread/pthread_mutex_lock.c
@@
-4,10
+4,11
@@
int pthread_mutex_lock(pthread_mutex_t *m)
{
int r;
while ((r=pthread_mutex_trylock(m)) == EBUSY) {
{
int r;
while ((r=pthread_mutex_trylock(m)) == EBUSY) {
- if (m->_m_type == PTHREAD_MUTEX_ERRORCHECK
- && m->_m_owner == pthread_self()->tid)
+ if (!(r=m->_m_lock) || (r&0x40000000)) continue;
+ if ((m->_m_type&3) == PTHREAD_MUTEX_ERRORCHECK
+ && (r&0x1fffffff) == pthread_self()->tid)
return EDEADLK;
return EDEADLK;
- __wait(&m->_m_lock, &m->_m_waiters,
1
, 0);
+ __wait(&m->_m_lock, &m->_m_waiters,
r
, 0);
}
return r;
}
}
return r;
}