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| author | Wilco Dijkstra <wdijkstr@arm.com> | 2022-09-22 15:32:40 +0100 |
|---|---|---|
| committer | Wilco Dijkstra <wdijkstr@arm.com> | 2022-09-23 15:59:56 +0100 |
| commit | d1babeb32de5dae8893c640bd925357b218d846c (patch) | |
| tree | c5ee8e42e03e6a4caf2eb645d5f9b7a8bdbdb6e1 /nptl | |
| parent | 8114b95cef10a5a1fc3e529ab8b3a75f56fe889a (diff) | |
| download | glibc-d1babeb32de5dae8893c640bd925357b218d846c.zip glibc-d1babeb32de5dae8893c640bd925357b218d846c.tar.gz glibc-d1babeb32de5dae8893c640bd925357b218d846c.tar.bz2 | |
Use C11 atomics instead of atomic_increment(_val)
Replace atomic_increment and atomic_increment_val with atomic_fetch_add_relaxed.
One case in sem_post.c uses release semantics (see comment above it).
The others are simple counters and do not protect any shared data from
concurrent accesses.
Passes regress on AArch64.
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Diffstat (limited to 'nptl')
| -rw-r--r-- | nptl/nptl_setxid.c | 2 | ||||
| -rw-r--r-- | nptl/pthread_create.c | 2 | ||||
| -rw-r--r-- | nptl/sem_post.c | 2 |
3 files changed, 3 insertions, 3 deletions
diff --git a/nptl/nptl_setxid.c b/nptl/nptl_setxid.c index e709822..301809d 100644 --- a/nptl/nptl_setxid.c +++ b/nptl/nptl_setxid.c @@ -163,7 +163,7 @@ setxid_signal_thread (struct xid_command *cmdp, struct pthread *t) /* If this failed, it must have had not started yet or else exited. */ if (!INTERNAL_SYSCALL_ERROR_P (val)) { - atomic_increment (&cmdp->cntr); + atomic_fetch_add_relaxed (&cmdp->cntr, 1); return 1; } else diff --git a/nptl/pthread_create.c b/nptl/pthread_create.c index 59d8df8..0df6748 100644 --- a/nptl/pthread_create.c +++ b/nptl/pthread_create.c @@ -759,7 +759,7 @@ __pthread_create_2_1 (pthread_t *newthread, const pthread_attr_t *attr, we momentarily store a false value; this doesn't matter because there is no kosher thing a signal handler interrupting us right here can do that cares whether the thread count is correct. */ - atomic_increment (&__nptl_nthreads); + atomic_fetch_add_relaxed (&__nptl_nthreads, 1); /* Our local value of stopped_start and thread_ran can be accessed at any time. The PD->stopped_start may only be accessed if we have diff --git a/nptl/sem_post.c b/nptl/sem_post.c index 9e57417..7ec21e9 100644 --- a/nptl/sem_post.c +++ b/nptl/sem_post.c @@ -91,7 +91,7 @@ __old_sem_post (sem_t *sem) /* We must need to synchronize with consumers of this token, so the atomic increment must have release MO semantics. */ atomic_write_barrier (); - (void) atomic_increment_val (futex); + atomic_fetch_add_release (futex, 1); /* We always have to assume it is a shared semaphore. */ futex_wake (futex, 1, LLL_SHARED); return 0; |