fluencelabs/musl
1
0
Fork 0
mirror of https://github.com/fluencelabs/musl synced 2025-07-03 00:22:11 +00:00
Code Issues Projects Releases Wiki Activity

spin before waiting on futex in mutex and rwlock lock operations

Browse Source
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
Download Patch File Download Diff File Expand all files Collapse all files

6
src/thread/pthread_mutex_timedlock.c
View File

@ -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;