diff options
Diffstat (limited to 'sysdeps')
| -rw-r--r-- | sysdeps/nptl/lowlevellock.h | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/sysdeps/nptl/lowlevellock.h b/sysdeps/nptl/lowlevellock.h index 548a9c842b..28f4ba3978 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; \ }) |