mirror of
https://github.com/qbittorrent/qBittorrent.git
synced 2025-01-04 22:27:28 +03:00
262 lines
7.9 KiB
C++
262 lines
7.9 KiB
C++
/*
|
|
* Bittorrent Client using Qt and libtorrent.
|
|
* Copyright (C) 2019 Mike Tzou (Chocobo1)
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version 2
|
|
* of the License, or (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
|
|
*
|
|
* In addition, as a special exception, the copyright holders give permission to
|
|
* link this program with the OpenSSL project's "OpenSSL" library (or with
|
|
* modified versions of it that use the same license as the "OpenSSL" library),
|
|
* and distribute the linked executables. You must obey the GNU General Public
|
|
* License in all respects for all of the code used other than "OpenSSL". If you
|
|
* modify file(s), you may extend this exception to your version of the file(s),
|
|
* but you are not obligated to do so. If you do not wish to do so, delete this
|
|
* exception statement from your version.
|
|
*
|
|
****************************************************************************
|
|
**
|
|
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
|
|
** Contact: http://www.qt-project.org/legal
|
|
**
|
|
** This file is part of the Qt Solutions component.
|
|
**
|
|
** $QT_BEGIN_LICENSE:BSD$
|
|
** You may use this file under the terms of the BSD license as follows:
|
|
**
|
|
** "Redistribution and use in source and binary forms, with or without
|
|
** modification, are permitted provided that the following conditions are
|
|
** met:
|
|
** * Redistributions of source code must retain the above copyright
|
|
** notice, this list of conditions and the following disclaimer.
|
|
** * Redistributions in binary form must reproduce the above copyright
|
|
** notice, this list of conditions and the following disclaimer in
|
|
** the documentation and/or other materials provided with the
|
|
** distribution.
|
|
** * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
|
|
** of its contributors may be used to endorse or promote products derived
|
|
** from this software without specific prior written permission.
|
|
**
|
|
**
|
|
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
|
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
|
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
|
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
|
|
**
|
|
** $QT_END_LICENSE$
|
|
**
|
|
****************************************************************************
|
|
*/
|
|
|
|
#include "qtlockedfile.h"
|
|
|
|
#include <QFileInfo>
|
|
|
|
#include "base/global.h"
|
|
|
|
// Maximum number of concurrent read locks. Must not be greater than MAXIMUM_WAIT_OBJECTS
|
|
const int MAX_READERS = MAXIMUM_WAIT_OBJECTS;
|
|
|
|
Qt::HANDLE QtLockedFile::getMutexHandle(const int idx, const bool doCreate)
|
|
{
|
|
if (m_mutexName.isEmpty())
|
|
{
|
|
QFileInfo fi(*this);
|
|
m_mutexName = u"QtLockedFile mutex " + fi.absoluteFilePath().toLower();
|
|
}
|
|
|
|
QString mname = m_mutexName;
|
|
if (idx >= 0)
|
|
mname += QString::number(idx);
|
|
|
|
const std::wstring mnameWStr = mname.toStdWString();
|
|
|
|
if (doCreate)
|
|
{
|
|
const Qt::HANDLE mutex = ::CreateMutexW(NULL, FALSE, mnameWStr.c_str());
|
|
if (!mutex)
|
|
{
|
|
qErrnoWarning("QtLockedFile::lock(): CreateMutex failed");
|
|
return nullptr;
|
|
}
|
|
|
|
return mutex;
|
|
}
|
|
else
|
|
{
|
|
const Qt::HANDLE mutex = ::OpenMutexW((SYNCHRONIZE | MUTEX_MODIFY_STATE), FALSE, mnameWStr.c_str());
|
|
if (!mutex)
|
|
{
|
|
if (GetLastError() != ERROR_FILE_NOT_FOUND)
|
|
qErrnoWarning("QtLockedFile::lock(): OpenMutex failed");
|
|
return nullptr;
|
|
}
|
|
|
|
return mutex;
|
|
}
|
|
|
|
return nullptr;
|
|
}
|
|
|
|
bool QtLockedFile::waitMutex(const Qt::HANDLE mutex, const bool doBlock) const
|
|
{
|
|
Q_ASSERT(mutex);
|
|
|
|
const DWORD res = ::WaitForSingleObject(mutex, (doBlock ? INFINITE : 0));
|
|
switch (res)
|
|
{
|
|
case WAIT_OBJECT_0:
|
|
case WAIT_ABANDONED:
|
|
return true;
|
|
case WAIT_TIMEOUT:
|
|
return false;
|
|
default:
|
|
qErrnoWarning("QtLockedFile::lock(): WaitForSingleObject failed");
|
|
break;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
bool QtLockedFile::lock(const LockMode mode, const bool block)
|
|
{
|
|
if (!isOpen())
|
|
{
|
|
qWarning("QtLockedFile::lock(): file is not opened");
|
|
return false;
|
|
}
|
|
|
|
if (mode == NoLock)
|
|
return unlock();
|
|
|
|
if (mode == m_lockMode)
|
|
return true;
|
|
|
|
if (m_lockMode != NoLock)
|
|
unlock();
|
|
|
|
if (!m_writeMutex && !(m_writeMutex = getMutexHandle(-1, true)))
|
|
return false;
|
|
|
|
if (!waitMutex(m_writeMutex, block))
|
|
return false;
|
|
|
|
if (mode == ReadLock)
|
|
{
|
|
int idx = 0;
|
|
for (; idx < MAX_READERS; ++idx)
|
|
{
|
|
m_readMutex = getMutexHandle(idx, false);
|
|
if (!m_readMutex || waitMutex(m_readMutex, false))
|
|
break;
|
|
::CloseHandle(m_readMutex);
|
|
}
|
|
|
|
bool ok = true;
|
|
if (idx >= MAX_READERS)
|
|
{
|
|
qWarning("QtLockedFile::lock(): too many readers");
|
|
m_readMutex = nullptr;
|
|
ok = false;
|
|
}
|
|
else if (!m_readMutex)
|
|
{
|
|
m_readMutex = getMutexHandle(idx, true);
|
|
if (!m_readMutex || !waitMutex(m_readMutex, false))
|
|
ok = false;
|
|
}
|
|
|
|
if (!ok && m_readMutex)
|
|
{
|
|
::CloseHandle(m_readMutex);
|
|
m_readMutex = nullptr;
|
|
}
|
|
|
|
::ReleaseMutex(m_writeMutex);
|
|
if (!ok)
|
|
return false;
|
|
}
|
|
else
|
|
{
|
|
Q_ASSERT(m_readMutexes.isEmpty());
|
|
for (int i = 0; i < MAX_READERS; ++i)
|
|
{
|
|
const Qt::HANDLE mutex = getMutexHandle(i, false);
|
|
if (mutex)
|
|
m_readMutexes.append(mutex);
|
|
}
|
|
if (m_readMutexes.size())
|
|
{
|
|
const DWORD res = ::WaitForMultipleObjects(m_readMutexes.size(), m_readMutexes.constData(),
|
|
TRUE, (block ? INFINITE : 0));
|
|
if ((res != WAIT_OBJECT_0) && (res != WAIT_ABANDONED))
|
|
{
|
|
if (res != WAIT_TIMEOUT)
|
|
qErrnoWarning("QtLockedFile::lock(): WaitForMultipleObjects failed");
|
|
m_lockMode = WriteLock; // trick unlock() to clean up - semiyucky
|
|
unlock();
|
|
return false;
|
|
}
|
|
}
|
|
}
|
|
|
|
m_lockMode = mode;
|
|
return true;
|
|
}
|
|
|
|
bool QtLockedFile::unlock()
|
|
{
|
|
if (!isOpen())
|
|
{
|
|
qWarning("QtLockedFile::unlock(): file is not opened");
|
|
return false;
|
|
}
|
|
|
|
if (!isLocked())
|
|
return true;
|
|
|
|
if (m_lockMode == ReadLock)
|
|
{
|
|
::ReleaseMutex(m_readMutex);
|
|
::CloseHandle(m_readMutex);
|
|
m_readMutex = nullptr;
|
|
}
|
|
else
|
|
{
|
|
for (const Qt::HANDLE &mutex : asConst(m_readMutexes))
|
|
{
|
|
::ReleaseMutex(mutex);
|
|
::CloseHandle(mutex);
|
|
}
|
|
m_readMutexes.clear();
|
|
::ReleaseMutex(m_writeMutex);
|
|
}
|
|
|
|
m_lockMode = QtLockedFile::NoLock;
|
|
return true;
|
|
}
|
|
|
|
QtLockedFile::~QtLockedFile()
|
|
{
|
|
if (isOpen())
|
|
unlock();
|
|
if (m_writeMutex)
|
|
::CloseHandle(m_writeMutex);
|
|
}
|