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clean up access to mutex type in pthread_mutex_trylock

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there was no point in masking off the pshared bit when first loading
the type, since every subsequent access involves a mask anyway. not
masking it may avoid a subsequent load to check the pshared flag, and
it's just simpler.
This commit is contained in:
Rich Felker
2019-03-29 15:49:14 -04:00
parent 54316a52b2
commit 2142cafdc7
1 changed files with 2 additions and 2 deletions
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src/thread/pthread_mutex_trylock.c
+2 -2
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@@ -3,7 +3,7 @@
int __pthread_mutex_trylock_owner(pthread_mutex_t *m)
{
int old, own;
int type = m->_m_type & 15;
int type = m->_m_type;
pthread_t self = __pthread_self();
int tid = self->tid;
@@ -17,7 +17,7 @@ int __pthread_mutex_trylock_owner(pthread_mutex_t *m)
if (own == 0x3fffffff) return ENOTRECOVERABLE;
if (own || (old && !(type & 4))) return EBUSY;
if (m->_m_type & 128) {
if (type & 128) {
if (!self->robust_list.off) {
self->robust_list.off = (char*)&m->_m_lock-(char *)&m->_m_next;
__syscall(SYS_set_robust_list, &self->robust_list, 3*sizeof(long));