| From | Arnaldo Carvalho de Melo <> | Subject | [PATCH 25/30] perf bench futex: Handle spurious wakeups | Date | Fri, 8 May 2015 17:56:37 -0300 |
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From: Davidlohr Bueso <dave@stgolabs.net>
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> --- 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; } -- 2.1.0
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