diff options
| -rw-r--r-- | ChangeLog | 6 | ||||
| -rw-r--r-- | sysdeps/nptl/lowlevellock.h | 5 |
2 files changed, 10 insertions, 1 deletions
@@ -1,3 +1,9 @@ +2014-08-12 Bernard Ogden <bernie.ogden@linaro.org> + + [BZ #16892] + * sysdeps/nptl/lowlevellock.h (__lll_timedlock): Use + atomic_compare_and_exchange_bool_acq rather than atomic_exchange_acq. + 2014-08-12 Sean Anderson <seanga2@gmail.com> * malloc/malloc.c: Fix typo in comment. diff --git a/sysdeps/nptl/lowlevellock.h b/sysdeps/nptl/lowlevellock.h index 548a9c8..28f4ba3 100644 --- a/sysdeps/nptl/lowlevellock.h +++ b/sysdeps/nptl/lowlevellock.h @@ -88,12 +88,15 @@ extern int __lll_timedlock_wait (int *futex, const struct timespec *, extern int __lll_robust_timedlock_wait (int *futex, const struct timespec *, int private) attribute_hidden; +/* Take futex if it is untaken. + Otherwise block until either we get the futex or abstime runs out. */ #define __lll_timedlock(futex, abstime, private) \ ({ \ int *__futex = (futex); \ int __val = 0; \ \ - if (__glibc_unlikely (atomic_exchange_acq (__futex, 1))) \ + if (__glibc_unlikely \ + (atomic_compare_and_exchange_bool_acq (__futex, 1, 0))) \ __val = __lll_timedlock_wait (__futex, abstime, private); \ __val; \ }) |