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 // TESTING EXTENSION atomic_flag(bool) 17 18 #include <atomic> 19 #include <cassert> 20 21 int main() 22 { 23 std::atomic_flag f(false); 24 assert(f.test_and_set() == 0); 25 } 26