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105 lines
3.1 KiB
C++
105 lines
3.1 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2013 David Faure <faure+bluesystems@kde.org>
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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 QtCore 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 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 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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** 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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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#ifndef QLOCKFILE_P_H
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#define QLOCKFILE_P_H
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//
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// W A R N I N G
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// -------------
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//
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// This file is not part of the Qt API. It exists purely as an
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// implementation detail. This header file may change from version to
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// version without notice, or even be removed.
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//
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// We mean it.
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//
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#include "qlockfile.h"
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#include <QFile>
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#include <QThread>
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#ifdef Q_OS_WIN
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#include <qt_windows.h>
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#endif
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QT_BEGIN_NAMESPACE
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class QLockFileThread : public QThread
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{
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public:
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static void msleep(unsigned long msecs) { QThread::msleep(msecs); }
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};
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class QLockFilePrivate
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{
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public:
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QLockFilePrivate(const QString &fn)
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: fileName(fn),
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#ifdef Q_OS_WIN
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fileHandle(INVALID_HANDLE_VALUE),
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#else
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fileHandle(-1),
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#endif
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staleLockTime(30 * 1000), // 30 seconds
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lockError(QLockFile::NoError),
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isLocked(false)
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{
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}
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QLockFile::LockError tryLock_sys();
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bool removeStaleLock();
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bool getLockInfo(qint64 *pid, QString *hostname, QString *appname) const;
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// Returns \c true if the lock belongs to dead PID, or is old.
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// The attempt to delete it will tell us if it was really stale or not, though.
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bool isApparentlyStale() const;
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#ifdef Q_OS_UNIX
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static int checkFcntlWorksAfterFlock();
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#endif
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QString fileName;
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#ifdef Q_OS_WIN
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Qt::HANDLE fileHandle;
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#else
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int fileHandle;
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#endif
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int staleLockTime; // "int milliseconds" is big enough for 24 days
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QLockFile::LockError lockError;
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bool isLocked;
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};
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QT_END_NAMESPACE
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#endif /* QLOCKFILE_P_H */
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