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Use C11 atomics instead of atomic_and/or

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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>
This commit is contained in:
Wilco Dijkstra 2022-09-22 15:27:20 +01:00
parent 774d43f27d
commit 8114b95cef
4 changed files with 4 additions and 4 deletions
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2
nptl/pthread_create.c
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@ -539,7 +539,7 @@ start_thread (void *arg)
# endif # endif
this->__list.__next = NULL; 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, futex_wake ((unsigned int *) &this->__lock, 1,
/* XYZ */ FUTEX_SHARED); /* XYZ */ FUTEX_SHARED);
} }

2
nptl/pthread_mutex_lock.c
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@ -462,7 +462,7 @@ __pthread_mutex_lock_full (pthread_mutex_t *mutex)
if (__glibc_unlikely (oldval & FUTEX_OWNER_DIED)) 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. */ /* We got the mutex. */
mutex->__data.__count = 1; mutex->__data.__count = 1;

2
nptl/pthread_mutex_timedlock.c
View File

@ -392,7 +392,7 @@ __pthread_mutex_clocklock_common (pthread_mutex_t *mutex,
if (__glibc_unlikely (oldval & FUTEX_OWNER_DIED)) 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. */ /* We got the mutex. */
mutex->__data.__count = 1; mutex->__data.__count = 1;

2
nptl/pthread_mutex_trylock.c
View File

@ -308,7 +308,7 @@ ___pthread_mutex_trylock (pthread_mutex_t *mutex)
if (__glibc_unlikely (oldval & FUTEX_OWNER_DIED)) 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. */ /* We got the mutex. */
mutex->__data.__count = 1; mutex->__data.__count = 1;