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git.ipfire.org Git - thirdparty/gcc.git/blob - libstdc++-v3/testsuite/29_atomics/atomic_flag/clear/1.cc
1 // { dg-do run { target c++11 } }
2 // { dg-require-thread-fence "" }
4 // Copyright (C) 2009-2021 Free Software Foundation, Inc.
6 // This file is part of the GNU ISO C++ Library. This library is free
7 // software; you can redistribute it and/or modify it under the
8 // terms of the GNU General Public License as published by the
9 // Free Software Foundation; either version 3, or (at your option)
12 // This library is distributed in the hope that it will be useful,
13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 // GNU General Public License for more details.
17 // You should have received a copy of the GNU General Public License along
18 // with this library; see the file COPYING3. If not see
19 // <http://www.gnu.org/licenses/>.
22 #include <testsuite_hooks.h>
26 std::atomic_flag f
= ATOMIC_FLAG_INIT
;
28 f
.clear(); // set to false
29 VERIFY( false == f
.test_and_set() ); // return true
30 VERIFY( true == f
.test_and_set() ); // return true
31 f
.clear(); // set to false
32 VERIFY( false == f
.test_and_set() ); // return previous false, set to true