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| author | Ulrich Drepper <drepper@redhat.com> | 2007-05-18 00:55:10 +0000 |
|---|---|---|
| committer | Ulrich Drepper <drepper@redhat.com> | 2007-05-18 00:55:10 +0000 |
| commit | 113ad5fc9192340269d2ce19b896d51309e785ea (patch) | |
| tree | 0028c672ecec9626a07fa3dfc5bcba89b690d2f4 /nptl/pthread_mutex_trylock.c | |
| parent | bec51a302f0e7046fcb8c4fcd13ea2969a43a9b7 (diff) | |
| download | glibc-113ad5fc9192340269d2ce19b896d51309e785ea.tar.gz glibc-113ad5fc9192340269d2ce19b896d51309e785ea.tar.xz glibc-113ad5fc9192340269d2ce19b896d51309e785ea.zip | |
[BZ #4512]
* pthread_mutex_lock.c: Preserve FUTEX_WAITERS bit when dead owner is detected. * pthread_mutex_timedlock.c: Likewise. * pthread_mutex_trylock.c: Likewise. Patch in part by Atsushi Nemoto <anemo@mba.ocn.ne.jp>. * Makefile (tests): Add tst-robust9 and tst-robustpi9. * tst-robust9.c: New file. * tst-robustpi9.c: New file.
Diffstat (limited to 'nptl/pthread_mutex_trylock.c')
| -rw-r--r-- | nptl/pthread_mutex_trylock.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/nptl/pthread_mutex_trylock.c b/nptl/pthread_mutex_trylock.c index 4990ecd711..9db904c60b 100644 --- a/nptl/pthread_mutex_trylock.c +++ b/nptl/pthread_mutex_trylock.c @@ -84,9 +84,11 @@ __pthread_mutex_trylock (mutex) if ((oldval & FUTEX_OWNER_DIED) != 0) { /* The previous owner died. Try locking the mutex. */ - int newval + int newval = id | (oldval & FUTEX_WAITERS); + + newval = atomic_compare_and_exchange_val_acq (&mutex->__data.__lock, - id, oldval); + newval, oldval); if (newval != oldval) { |