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 clear(memory_order = memory_order_seq_cst); 17// void clear(memory_order = memory_order_seq_cst) volatile; 18 19#include <atomic> 20#include <cassert> 21 22int main() 23{ 24 { 25 std::atomic_flag f; 26 f.test_and_set(); 27 f.clear(); 28 assert(f.test_and_set() == 0); 29 } 30 { 31 std::atomic_flag f; 32 f.test_and_set(); 33 f.clear(std::memory_order_relaxed); 34 assert(f.test_and_set() == 0); 35 } 36 { 37 std::atomic_flag f; 38 f.test_and_set(); 39 f.clear(std::memory_order_release); 40 assert(f.test_and_set() == 0); 41 } 42 { 43 std::atomic_flag f; 44 f.test_and_set(); 45 f.clear(std::memory_order_seq_cst); 46 assert(f.test_and_set() == 0); 47 } 48 { 49 volatile std::atomic_flag f; 50 f.test_and_set(); 51 f.clear(); 52 assert(f.test_and_set() == 0); 53 } 54 { 55 volatile std::atomic_flag f; 56 f.test_and_set(); 57 f.clear(std::memory_order_relaxed); 58 assert(f.test_and_set() == 0); 59 } 60 { 61 volatile std::atomic_flag f; 62 f.test_and_set(); 63 f.clear(std::memory_order_release); 64 assert(f.test_and_set() == 0); 65 } 66 { 67 volatile std::atomic_flag f; 68 f.test_and_set(); 69 f.clear(std::memory_order_seq_cst); 70 assert(f.test_and_set() == 0); 71 } 72} 73