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-rw-r--r--nptl/tst-call-once.c66
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diff --git a/nptl/tst-call-once.c b/nptl/tst-call-once.c
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+/* C11 threads call_once test.
+ Copyright (C) 2018 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
+ <http://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>