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>

diff --git a/tools/perf/bench/futex-wake.c b/tools/perf/bench/futex-wake.c
index 929f762..e5e41d3 100644 (file)
--- a/tools/perf/bench/futex-wake.c
+++ b/tools/perf/bench/futex-wake.c
@@ -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;
 }