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spin before waiting on futex in mutex and rwlock lock operations

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This commit is contained in:
Rich Felker 2014-08-25 20:16:26 -04:00
parent 2ff714c613
commit 97a7512b68
3 changed files with 20 additions and 0 deletions
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6
src/thread/pthread_mutex_timedlock.c
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@ -8,6 +8,12 @@ int pthread_mutex_timedlock(pthread_mutex_t *restrict m, const struct timespec *
int r, t, priv = (m->_m_type & 128) ^ 128;
r = pthread_mutex_trylock(m);
if (r != EBUSY) return r;
int spins = 100;
while (spins-- && m->_m_lock) a_spin();
while ((r=pthread_mutex_trylock(m)) == EBUSY) {
if (!(r=m->_m_lock) || ((r&0x40000000) && (m->_m_type&4)))
continue;

7
src/thread/pthread_rwlock_timedrdlock.c
View File

@ -3,6 +3,13 @@
int pthread_rwlock_timedrdlock(pthread_rwlock_t *restrict rw, const struct timespec *restrict at)
{
int r, t;
r = pthread_rwlock_tryrdlock(rw);
if (r != EBUSY) return r;
int spins = 100;
while (spins-- && rw->_rw_lock) a_spin();
while ((r=pthread_rwlock_tryrdlock(rw))==EBUSY) {
if (!(r=rw->_rw_lock) || (r&0x7fffffff)!=0x7fffffff) continue;
t = r | 0x80000000;

7
src/thread/pthread_rwlock_timedwrlock.c
View File

@ -3,6 +3,13 @@
int pthread_rwlock_timedwrlock(pthread_rwlock_t *restrict rw, const struct timespec *restrict at)
{
int r, t;
r = pthread_rwlock_trywrlock(rw);
if (r != EBUSY) return r;
int spins = 100;
while (spins-- && rw->_rw_lock) a_spin();
while ((r=pthread_rwlock_trywrlock(rw))==EBUSY) {
if (!(r=rw->_rw_lock)) continue;
t = r | 0x80000000;