1 files changed, 66 insertions, 0 deletions
diff --git a/sysdeps/pthread/tst-call-once.c b/sysdeps/pthread/tst-call-once.c
new file mode 100644
index 0000000000..c198233e8d
--- /dev/null
+++ b/sysdeps/pthread/tst-call-once.c
@@ -0,0 +1,66 @@
+/* C11 threads call_once test.
+   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>
+
+/* Flag that controls the first thread access.  */
+static once_flag flag = ONCE_FLAG_INIT;
+
+static int value = 0;
+
+static void
+do_once (void)
+{
+  value++;
+}
+
+static int
+func (void* data)
+{
+  call_once (&flag, do_once);
+  thrd_exit (thrd_success);
+}
+
+#define N 20
+
+int
+do_test (void)
+{
+  thrd_t ids[N];
+
+  for (int i = 0; i < N; ++i)
+    {
+      if (thrd_create (&ids[i], func, NULL) != thrd_success)
+	FAIL_EXIT1 ("thrd_create failed");
+    }
+
+  /* Join threads.  */
+  for (int i = 0; i < N; ++i)
+    {
+      if (thrd_join (ids[i], NULL) != thrd_success)
+	FAIL_EXIT1 ("thrd_join failed");
+    }
+
+  return (value != 1);
+}
+
+#include <support/test-driver.c>