1 files changed, 52 insertions, 0 deletions
diff --git a/sysdeps/pthread/tst-mutex-errorcheck.c b/sysdeps/pthread/tst-mutex-errorcheck.c
new file mode 100644
index 0000000000..cb140f94a0
--- /dev/null
+++ b/sysdeps/pthread/tst-mutex-errorcheck.c
@@ -0,0 +1,52 @@
+/* Check that error checking mutexes are not subject to lock elision.
+   Copyright (C) 2016-2020 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include <stdio.h>
+#include <errno.h>
+#include <time.h>
+#include <pthread.h>
+#include <support/check.h>
+
+static int
+do_test (void)
+{
+  struct timespec tms = { 0 };
+  pthread_mutex_t mutex;
+  pthread_mutexattr_t mutexattr;
+  int ret = 0;
+
+  TEST_COMPARE (pthread_mutexattr_init (&mutexattr), 0);
+  TEST_COMPARE (pthread_mutexattr_settype (&mutexattr,
+                                           PTHREAD_MUTEX_ERRORCHECK), 0);
+
+  TEST_COMPARE (pthread_mutex_init (&mutex, &mutexattr), 0);
+  TEST_COMPARE (pthread_mutexattr_destroy (&mutexattr), 0);
+
+  /* The call to pthread_mutex_timedlock erroneously enabled lock elision
+     on the mutex, which then triggered an assertion failure in
+     pthread_mutex_unlock.  It would also defeat the error checking nature
+     of the mutex.  */
+  TEST_COMPARE (pthread_mutex_timedlock (&mutex, &tms), 0);
+  TEST_COMPARE (pthread_mutex_timedlock (&mutex, &tms), EDEADLK);
+
+  TEST_COMPARE (pthread_mutex_unlock (&mutex), 0);
+
+  return ret;
+}
+
+#include <support/test-driver.c>