linux-kernel - [PATCH 2/2] perf bench futex: Handle spurious wakeups

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Message-Id: <1431110280-20231-2-git-send-email-dave@stgolabs.net>
Date:	Fri,  8 May 2015 11:38:00 -0700
From:	Davidlohr Bueso <dave@...olabs.net>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Ingo Molnar <mingo@...nel.org>
Cc:	linux-kernel@...r.kernel.org, dave@...olabs.net,
	Davidlohr Bueso <dbueso@...e.de>
Subject: [PATCH 2/2] 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@...e.de>
---
 tools/perf/bench/futex-wake.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/tools/perf/bench/futex-wake.c b/tools/perf/bench/futex-wake.c
index 929f762..e5e41d3 100644
--- 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;
 }
 
-- 
2.1.4

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