1//===----------------------------------------------------------------------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is dual licensed under the MIT and the University of Illinois Open
6// Source Licenses. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// UNSUPPORTED: libcpp-has-no-threads
11
12// <atomic>
13
14// struct atomic_flag
15
16// void atomic_flag_clear(volatile atomic_flag*);
17// void atomic_flag_clear(atomic_flag*);
18
19#include <atomic>
20#include <cassert>
21
22int main()
23{
24    {
25        std::atomic_flag f;
26        f.test_and_set();
27        atomic_flag_clear(&f);
28        assert(f.test_and_set() == 0);
29    }
30    {
31        volatile std::atomic_flag f;
32        f.test_and_set();
33        atomic_flag_clear(&f);
34        assert(f.test_and_set() == 0);
35    }
36}
37