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perf bench futex: Handle spurious wakeups

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Wrap futex_wait around a loop and catch for EINTR.

Either a spurious wakeup occurred or a signal interrupted is, either way
we need to block again.

Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Cc: Davidlohr Bueso <dbueso@suse.de>
Link: http://lkml.kernel.org/r/1431110280-20231-2-git-send-email-dave@stgolabs.net
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Davidlohr Bueso 2015-05-08 11:38:00 -07:00 committed by Arnaldo Carvalho de Melo
parent d65817b4e7
commit 598adc5c9c
1 changed files with 6 additions and 1 deletions
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7
tools/perf/bench/futex-wake.c
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@ -60,7 +60,12 @@ static void *workerfn(void *arg __maybe_unused)
pthread_cond_wait(&thread_worker, &thread_lock);
pthread_mutex_unlock(&thread_lock);
futex_wait(&futex1, 0, NULL, futex_flag);
while (1) {
if (futex_wait(&futex1, 0, NULL, futex_flag) != EINTR)
break;
}
pthread_exit(NULL);
return NULL;
}