diff options
Diffstat (limited to 'src/thread/pthread_rwlock_tryrdlock.c')
| -rw-r--r-- | src/thread/pthread_rwlock_tryrdlock.c | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/src/thread/pthread_rwlock_tryrdlock.c b/src/thread/pthread_rwlock_tryrdlock.c index f860ec71..fa271fcc 100644 --- a/src/thread/pthread_rwlock_tryrdlock.c +++ b/src/thread/pthread_rwlock_tryrdlock.c @@ -2,12 +2,12 @@ int pthread_rwlock_tryrdlock(pthread_rwlock_t *rw) { - a_inc(&rw->_rw_readers); - if (rw->_rw_wrlock) { - a_dec(&rw->_rw_readers); - if (rw->_rw_waiters && !rw->_rw_readers) - __wake(&rw->_rw_readers, 1, 0); - return EBUSY; - } + int val, cnt; + do { + val = rw->_rw_lock; + cnt = val & 0x7fffffff; + if (cnt == 0x7fffffff) return EBUSY; + if (cnt == 0x7ffffffe) return EAGAIN; + } while (a_cas(&rw->_rw_lock, val, val+1) != val); return 0; } |