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| author | Rich Felker <dalias@aerifal.cx> | 2014-08-25 20:16:26 -0400 |
|---|---|---|
| committer | Rich Felker <dalias@aerifal.cx> | 2014-08-25 20:16:26 -0400 |
| commit | 97a7512b6819014d15c679c8998caa0006d13c29 (patch) | |
| tree | 0203f9cb4abd79be05dba04696903ef51e2dbc44 /src/thread/pthread_rwlock_timedrdlock.c | |
| parent | 2ff714c6138da8abb50fd532503fd8d68a18811a (diff) | |
| download | musl-97a7512b6819014d15c679c8998caa0006d13c29.tar.gz musl-97a7512b6819014d15c679c8998caa0006d13c29.tar.bz2 musl-97a7512b6819014d15c679c8998caa0006d13c29.tar.xz musl-97a7512b6819014d15c679c8998caa0006d13c29.zip | |
spin before waiting on futex in mutex and rwlock lock operations
Diffstat (limited to 'src/thread/pthread_rwlock_timedrdlock.c')
| -rw-r--r-- | src/thread/pthread_rwlock_timedrdlock.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/src/thread/pthread_rwlock_timedrdlock.c b/src/thread/pthread_rwlock_timedrdlock.c index a2b4d446..884b7a1e 100644 --- a/src/thread/pthread_rwlock_timedrdlock.c +++ b/src/thread/pthread_rwlock_timedrdlock.c @@ -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; |