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// <atomic> 11 12// struct atomic_flag 13 14// bool atomic_flag_test_and_set(volatile atomic_flag*); 15// bool atomic_flag_test_and_set(atomic_flag*); 16 17#include <atomic> 18#include <cassert> 19 20int main() 21{ 22 { 23 std::atomic_flag f; 24 f.clear(); 25 assert(atomic_flag_test_and_set(&f) == 0); 26 assert(f.test_and_set() == 1); 27 } 28 { 29 volatile std::atomic_flag f; 30 f.clear(); 31 assert(atomic_flag_test_and_set(&f) == 0); 32 assert(f.test_and_set() == 1); 33 } 34} 35