linux-kernel - [tip:perf/core] perf bench futex: Handle spurious wakeups

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Date:	Sun, 10 May 2015 00:11:04 -0700
From:	tip-bot for Davidlohr Bueso <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	acme@...hat.com, dave@...olabs.net, hpa@...or.com,
	mingo@...nel.org, dbueso@...e.de, tglx@...utronix.de,
	linux-kernel@...r.kernel.org
Subject: [tip:perf/core] perf bench futex: Handle spurious wakeups

Commit-ID:  598adc5c9c1cfd3f154f6d9df72b38eda63e306e
Gitweb:     http://git.kernel.org/tip/598adc5c9c1cfd3f154f6d9df72b38eda63e306e
Author:     Davidlohr Bueso <dave@...olabs.net>
AuthorDate: Fri, 8 May 2015 11:38:00 -0700
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Fri, 8 May 2015 16:24:02 -0300

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>
Cc: Davidlohr Bueso <dbueso@...e.de>
Link: http://lkml.kernel.org/r/1431110280-20231-2-git-send-email-dave@stgolabs.net
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 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;
 }
 
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