1 files changed, 74 insertions, 0 deletions
diff --git a/nsprpub/pr/tests/monref.c b/nsprpub/pr/tests/monref.c
new file mode 100644
index 0000000000..3e2ae637bf
--- /dev/null
+++ b/nsprpub/pr/tests/monref.c
@@ -0,0 +1,74 @@
+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+ * This test program demonstrates that PR_ExitMonitor needs to add a
+ * reference to the PRMonitor object before unlocking the internal
+ * mutex.
+ */
+
+#include "prlog.h"
+#include "prmon.h"
+#include "prthread.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+
+/* Protected by the PRMonitor 'mon' in the main function. */
+static PRBool done = PR_FALSE;
+
+static void ThreadFunc(void *arg)
+{
+    PRMonitor *mon = (PRMonitor *)arg;
+    PRStatus rv;
+
+    PR_EnterMonitor(mon);
+    done = PR_TRUE;
+    rv = PR_Notify(mon);
+    PR_ASSERT(rv == PR_SUCCESS);
+    rv = PR_ExitMonitor(mon);
+    PR_ASSERT(rv == PR_SUCCESS);
+}
+
+int main()
+{
+    PRMonitor *mon;
+    PRThread *thread;
+    PRStatus rv;
+
+    mon = PR_NewMonitor();
+    if (!mon) {
+        fprintf(stderr, "PR_NewMonitor failed\n");
+        exit(1);
+    }
+
+    thread = PR_CreateThread(PR_USER_THREAD, ThreadFunc, mon,
+                             PR_PRIORITY_NORMAL, PR_GLOBAL_THREAD,
+                             PR_JOINABLE_THREAD, 0);
+    if (!thread) {
+        fprintf(stderr, "PR_CreateThread failed\n");
+        exit(1);
+    }
+
+    PR_EnterMonitor(mon);
+    while (!done) {
+        rv = PR_Wait(mon, PR_INTERVAL_NO_TIMEOUT);
+        PR_ASSERT(rv == PR_SUCCESS);
+    }
+    rv = PR_ExitMonitor(mon);
+    PR_ASSERT(rv == PR_SUCCESS);
+
+    /*
+     * Do you agree it should be safe to destroy 'mon' now?
+     * See bug 844784 comment 27.
+     */
+    PR_DestroyMonitor(mon);
+
+    rv = PR_JoinThread(thread);
+    PR_ASSERT(rv == PR_SUCCESS);
+
+    printf("PASS\n");
+    return 0;
+}