From: Jens Axboe <axboe@fb.com>
Date: Mon, 24 Oct 2016 16:49:48 +0000 (-0600)
Subject: mutex: clear mutex when removed
X-Git-Tag: fio-2.15~4
X-Git-Url: https://git.kernel.dk/?p=fio.git;a=commitdiff_plain;h=4e1cc8e6ddf90e4e2fa5eab27cca4110e4dce1bb

mutex: clear mutex when removed

This ensures that any attempt to grab it after it has been removed
will trigger an assert, instead of just silently hanging.

Signed-off-by: Jens Axboe <axboe@fb.com>
---

diff --git a/mutex.c b/mutex.c
index 75809221..e5b045ec 100644
--- a/mutex.c
+++ b/mutex.c
@@ -22,6 +22,12 @@ void __fio_mutex_remove(struct fio_mutex *mutex)
 {
 	assert(mutex->magic == FIO_MUTEX_MAGIC);
 	pthread_cond_destroy(&mutex->cond);
+
+	/*
+	 * Ensure any subsequent attempt to grab this mutex will fail
+	 * with an assert, instead of just silently hanging.
+	 */
+	memset(mutex, 0, sizeof(*mutex));
 }
 
 void fio_mutex_remove(struct fio_mutex *mutex)