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| author | Wilco Dijkstra <wdijkstr@arm.com> | 2022-09-22 15:27:20 +0100 |
|---|---|---|
| committer | Wilco Dijkstra <wdijkstr@arm.com> | 2022-09-23 15:59:56 +0100 |
| commit | 8114b95cef10a5a1fc3e529ab8b3a75f56fe889a (patch) | |
| tree | 3c9a41560970946fdb2db5808bfa35518e5abd50 | |
| parent | 774d43f27dbc730ee4b8b37bce4d5b3d5c0b74b6 (diff) | |
| download | glibc-8114b95cef10a5a1fc3e529ab8b3a75f56fe889a.tar.gz glibc-8114b95cef10a5a1fc3e529ab8b3a75f56fe889a.tar.xz glibc-8114b95cef10a5a1fc3e529ab8b3a75f56fe889a.zip | |
Use C11 atomics instead of atomic_and/or
Remove the 4 uses of atomic_and and atomic_or with atomic_fetch_and_acquire and atomic_fetch_or_acquire. This is preserves existing implied semantics, however relaxed MO on FUTEX_OWNER_DIED accesses may be correct. Passes regress on AArch64. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
| -rw-r--r-- | nptl/pthread_create.c | 2 | ||||
| -rw-r--r-- | nptl/pthread_mutex_lock.c | 2 | ||||
| -rw-r--r-- | nptl/pthread_mutex_timedlock.c | 2 | ||||
| -rw-r--r-- | nptl/pthread_mutex_trylock.c | 2 |
4 files changed, 4 insertions, 4 deletions
diff --git a/nptl/pthread_create.c b/nptl/pthread_create.c index ee29cb375d..59d8df8cd7 100644 --- a/nptl/pthread_create.c +++ b/nptl/pthread_create.c @@ -539,7 +539,7 @@ start_thread (void *arg) # endif this->__list.__next = NULL; - atomic_or (&this->__lock, FUTEX_OWNER_DIED); + atomic_fetch_or_acquire (&this->__lock, FUTEX_OWNER_DIED); futex_wake ((unsigned int *) &this->__lock, 1, /* XYZ */ FUTEX_SHARED); } diff --git a/nptl/pthread_mutex_lock.c b/nptl/pthread_mutex_lock.c index 6e767a8724..439b1e6391 100644 --- a/nptl/pthread_mutex_lock.c +++ b/nptl/pthread_mutex_lock.c @@ -462,7 +462,7 @@ __pthread_mutex_lock_full (pthread_mutex_t *mutex) if (__glibc_unlikely (oldval & FUTEX_OWNER_DIED)) { - atomic_and (&mutex->__data.__lock, ~FUTEX_OWNER_DIED); + atomic_fetch_and_acquire (&mutex->__data.__lock, ~FUTEX_OWNER_DIED); /* We got the mutex. */ mutex->__data.__count = 1; diff --git a/nptl/pthread_mutex_timedlock.c b/nptl/pthread_mutex_timedlock.c index 0fcaabfb48..af70a60528 100644 --- a/nptl/pthread_mutex_timedlock.c +++ b/nptl/pthread_mutex_timedlock.c @@ -392,7 +392,7 @@ __pthread_mutex_clocklock_common (pthread_mutex_t *mutex, if (__glibc_unlikely (oldval & FUTEX_OWNER_DIED)) { - atomic_and (&mutex->__data.__lock, ~FUTEX_OWNER_DIED); + atomic_fetch_and_acquire (&mutex->__data.__lock, ~FUTEX_OWNER_DIED); /* We got the mutex. */ mutex->__data.__count = 1; diff --git a/nptl/pthread_mutex_trylock.c b/nptl/pthread_mutex_trylock.c index 8a7de8e598..50524942a7 100644 --- a/nptl/pthread_mutex_trylock.c +++ b/nptl/pthread_mutex_trylock.c @@ -308,7 +308,7 @@ ___pthread_mutex_trylock (pthread_mutex_t *mutex) if (__glibc_unlikely (oldval & FUTEX_OWNER_DIED)) { - atomic_and (&mutex->__data.__lock, ~FUTEX_OWNER_DIED); + atomic_fetch_and_acquire (&mutex->__data.__lock, ~FUTEX_OWNER_DIED); /* We got the mutex. */ mutex->__data.__count = 1; |