Commit 598adc5c authored May 08, 2015 by Davidlohr Bueso Committed by Arnaldo Carvalho de Melo May 08, 2015

perf bench futex: Handle spurious wakeups



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>

parent d65817b4

tools/perf/bench/futex-wake.c

+6 −1

Original line number	Diff line number	Diff line
		@@ -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;
		}