59 lines
2.1 KiB
C++
59 lines
2.1 KiB
C++
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/****************************************************************************
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**
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** Copyright (C) 2016 Intel Corporation.
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** Contact: http://www.qt.io/licensing/
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**
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** This file is part of the FOO module of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL21$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms
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** and conditions see http://www.qt.io/terms-conditions. For further
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** information use the contact form at http://www.qt.io/contact-us.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 or version 3 as published by the Free
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** Software Foundation and appearing in the file LICENSE.LGPLv21 and
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** LICENSE.LGPLv3 included in the packaging of this file. Please review the
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** following information to ensure the GNU Lesser General Public License
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** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
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** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** As a special exception, The Qt Company gives you certain additional
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** rights. These rights are described in The Qt Company LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include <atomic>
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typedef void (*fptr)(int);
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typedef std::atomic<fptr> atomicfptr;
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void testfunction(int) { }
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void test(volatile atomicfptr &a)
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{
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fptr v = a.load(std::memory_order_acquire);
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while (!a.compare_exchange_strong(v, &testfunction,
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std::memory_order_acq_rel,
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std::memory_order_acquire)) {
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v = a.exchange(&testfunction);
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}
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a.store(&testfunction, std::memory_order_release);
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}
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int main(int, char **)
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{
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atomicfptr fptr(testfunction);
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test(fptr);
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return 0;
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}
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