f927efd77a
eventfd(7) uses less resources than a pipe, as it only needs to store a single 64-bit integer, as opposed to a full buffer. It was introduced first on Linux version 2.6.22 and glibc 2.7. However, both the configure-time test and the runtime usage require the use of EFD_CLOEXEC for thread-safety, so this code will be enabled only for Linux 2.6.27 and up as well as glibc 2.9 and up. Change-Id: Ic7e10b28d7b1d4ca24be614ed84055c4429a68e4 Reviewed-by: Robin Burchell <robin+qt@viroteck.net> Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
52 lines
2.1 KiB
C++
52 lines
2.1 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2012 Intel Corporation
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** Contact: http://www.qt-project.org/legal
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**
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** This file is part of the config.tests of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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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 Digia. For licensing terms and
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** conditions see http://qt.digia.com/licensing. For further information
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** use the contact form at http://qt.digia.com/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 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU Lesser General Public License version 2.1 requirements
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, Digia gives you certain additional
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** rights. These rights are described in the Digia Qt 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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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 3.0 as published by the Free Software
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** Foundation and appearing in the file LICENSE.GPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU General Public License version 3.0 requirements will be
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** met: http://www.gnu.org/copyleft/gpl.html.
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**
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include <sys/eventfd.h>
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int main()
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{
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eventfd_t value;
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int fd = eventfd(0, EFD_CLOEXEC);
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eventfd_read(fd, &value);
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eventfd_write(fd, value);
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return 0;
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}
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