| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // UNSUPPORTED: libcpp-has-no-threads |
| |
| // <atomic> |
| |
| // struct atomic_flag |
| |
| // TESTING EXTENSION atomic_flag(bool) |
| |
| #include <atomic> |
| #include <cassert> |
| |
| #include "test_macros.h" |
| |
| #if TEST_STD_VER >= 11 |
| // Ensure that static initialization happens; this is PR#37226 |
| extern std::atomic_flag global; |
| struct X { X() { global.test_and_set(); }}; |
| X x; |
| std::atomic_flag global = ATOMIC_FLAG_INIT; |
| #endif |
| |
| int main(int, char**) |
| { |
| #if TEST_STD_VER >= 11 |
| assert(global.test_and_set() == 1); |
| #endif |
| { |
| std::atomic_flag f(false); |
| assert(f.test_and_set() == 0); |
| } |
| { |
| std::atomic_flag f(true); |
| assert(f.test_and_set() == 1); |
| } |
| |
| return 0; |
| } |