40 lines · cpp
1//===----------------------------------------------------------------------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9// <atomic>10 11// struct atomic_flag12 13// bool atomic_flag_test(const volatile atomic_flag*);14// bool atomic_flag_test(const atomic_flag*);15 16#include <atomic>17#include <cassert>18 19#include "test_macros.h"20 21int main(int, char**)22{23 {24 std::atomic_flag f;25 f.clear();26 assert(std::atomic_flag_test(&f) == 0);27 assert(f.test_and_set() == 0);28 assert(std::atomic_flag_test(&f) == 1);29 }30 {31 volatile std::atomic_flag f;32 f.clear();33 assert(std::atomic_flag_test(&f) == 0);34 assert(f.test_and_set() == 0);35 assert(std::atomic_flag_test(&f) == 1);36 }37 38 return 0;39}40