1 files changed, 73 insertions, 0 deletions
diff --git a/sysdeps/pthread/tst-mtx-basic.c b/sysdeps/pthread/tst-mtx-basic.c
new file mode 100644
index 0000000000..1e3d809bd0
--- /dev/null
+++ b/sysdeps/pthread/tst-mtx-basic.c
@@ -0,0 +1,73 @@
+/* C11 threads basic mutex tests.
+   Copyright (C) 2018-2020 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 <threads.h>
+#include <stdio.h>
+#include <unistd.h>
+
+#include <support/check.h>
+
+/* Shared mutex between child and parent.  */
+static mtx_t mutex;
+
+/* Shared counter to check possible race conditions.  */
+static int counter;
+
+static int
+child_add (void *arg)
+{
+  if (mtx_lock (&mutex) != thrd_success)
+    FAIL_EXIT1 ("mtx_lock failed");
+
+  counter++;
+
+  if (mtx_unlock (&mutex) != thrd_success)
+    FAIL_EXIT1 ("mtx_unlock failed");
+
+  thrd_exit (thrd_success);
+}
+
+static int
+do_test (void)
+{
+  mtx_init (&mutex, mtx_plain);
+
+  thrd_t id;
+  if (thrd_create (&id, child_add, NULL) != thrd_success)
+    FAIL_EXIT1 ("thrd_create failed");
+
+  if (mtx_lock (&mutex) != thrd_success)
+    FAIL_EXIT1 ("mtx_lock failed");
+
+  counter++;
+
+  if (mtx_unlock (&mutex) != thrd_success)
+    FAIL_EXIT1 ("mtx_unlock failed");
+
+  if (thrd_join (id, NULL) != thrd_success)
+    FAIL_EXIT1 ("thrd_join failed");
+
+  if (counter != 2)
+    FAIL_EXIT1 ("counter (%d) != 2", counter);
+
+  mtx_destroy (&mutex);
+
+  return 0;
+}
+
+#include <support/test-driver.c>