diff options
Diffstat (limited to 'nptl/pthread_rwlock_timedwrlock.c')
| -rw-r--r-- | nptl/pthread_rwlock_timedwrlock.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/nptl/pthread_rwlock_timedwrlock.c b/nptl/pthread_rwlock_timedwrlock.c index a759fa997f..c54253450b 100644 --- a/nptl/pthread_rwlock_timedwrlock.c +++ b/nptl/pthread_rwlock_timedwrlock.c @@ -141,8 +141,16 @@ pthread_rwlock_timedwrlock (rwlock, abstime) /* If we prefer writers, it can have happened that readers blocked for us to acquire the lock first. If we have timed out, we need to wake such readers if there are any, and if there is no writer - currently (otherwise, the writer will take care of wake-up). */ - if (!PTHREAD_RWLOCK_PREFER_READER_P (rwlock) + currently (otherwise, the writer will take care of wake-up). + Likewise, even if we prefer readers, we can be responsible for + wake-up (see pthread_rwlock_unlock) if no reader or writer has + acquired the lock. We have timed out and thus not consumed a + futex wake-up; therefore, if there is no other blocked writer + that would consume the wake-up and thus take over responsibility, + we need to wake blocked readers. */ + if ((!PTHREAD_RWLOCK_PREFER_READER_P (rwlock) + || ((rwlock->__data.__nr_readers == 0) + && (rwlock->__data.__nr_writers_queued == 0))) && (rwlock->__data.__nr_readers_queued > 0) && (rwlock->__data.__writer == 0)) { |