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@ -70,64 +70,73 @@ |
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#include <QFileInfo> |
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#include <QFileInfo> |
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#define MUTEX_PREFIX "QtLockedFile mutex " |
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#include "base/global.h" |
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// Maximum number of concurrent read locks. Must not be greater than MAXIMUM_WAIT_OBJECTS
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#define MAX_READERS MAXIMUM_WAIT_OBJECTS |
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#define QT_WA(unicode, ansi) unicode |
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// Maximum number of concurrent read locks. Must not be greater than MAXIMUM_WAIT_OBJECTS
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const int MAX_READERS = MAXIMUM_WAIT_OBJECTS; |
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Qt::HANDLE QtLockedFile::getMutexHandle(int idx, bool doCreate) |
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Qt::HANDLE QtLockedFile::getMutexHandle(const int idx, const bool doCreate) |
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{ |
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{ |
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if (mutexname.isEmpty()) { |
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if (m_mutexName.isEmpty()) |
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{ |
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QFileInfo fi(*this); |
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QFileInfo fi(*this); |
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mutexname = QString::fromLatin1(MUTEX_PREFIX) |
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m_mutexName = QString::fromLatin1("QtLockedFile mutex ") + fi.absoluteFilePath().toLower(); |
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+ fi.absoluteFilePath().toLower(); |
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} |
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} |
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QString mname(mutexname); |
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QString mname = m_mutexName; |
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if (idx >= 0) |
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if (idx >= 0) |
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mname += QString::number(idx); |
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mname += QString::number(idx); |
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Qt::HANDLE mutex; |
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if (doCreate) |
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if (doCreate) { |
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{ |
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QT_WA( { mutex = CreateMutexW(NULL, FALSE, reinterpret_cast<const TCHAR *>(mname.utf16())); }, |
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const Qt::HANDLE mutex = ::CreateMutexW(NULL, FALSE, reinterpret_cast<const TCHAR *>(mname.utf16())); |
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{ mutex = CreateMutexA(NULL, FALSE, mname.toLocal8Bit().constData()); } ); |
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if (!mutex) |
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if (!mutex) { |
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{ |
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qErrnoWarning("QtLockedFile::lock(): CreateMutex failed"); |
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qErrnoWarning("QtLockedFile::lock(): CreateMutex failed"); |
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return 0; |
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return nullptr; |
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} |
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} |
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return mutex; |
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} |
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} |
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else { |
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else |
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QT_WA( { mutex = OpenMutexW(SYNCHRONIZE | MUTEX_MODIFY_STATE, FALSE, reinterpret_cast<const TCHAR *>(mname.utf16())); }, |
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{ |
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{ mutex = OpenMutexA(SYNCHRONIZE | MUTEX_MODIFY_STATE, FALSE, mname.toLocal8Bit().constData()); } ); |
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const Qt::HANDLE mutex = ::OpenMutexW((SYNCHRONIZE | MUTEX_MODIFY_STATE), FALSE, reinterpret_cast<const TCHAR *>(mname.utf16())); |
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if (!mutex) { |
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if (!mutex) |
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{ |
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if (GetLastError() != ERROR_FILE_NOT_FOUND) |
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if (GetLastError() != ERROR_FILE_NOT_FOUND) |
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qErrnoWarning("QtLockedFile::lock(): OpenMutex failed"); |
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qErrnoWarning("QtLockedFile::lock(): OpenMutex failed"); |
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return 0; |
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return nullptr; |
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} |
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} |
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} |
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return mutex; |
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return mutex; |
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} |
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return nullptr; |
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} |
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} |
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bool QtLockedFile::waitMutex(Qt::HANDLE mutex, bool doBlock) |
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bool QtLockedFile::waitMutex(const Qt::HANDLE mutex, const bool doBlock) const |
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{ |
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{ |
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Q_ASSERT(mutex); |
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Q_ASSERT(mutex); |
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DWORD res = WaitForSingleObject(mutex, doBlock ? INFINITE : 0); |
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switch (res) { |
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const DWORD res = ::WaitForSingleObject(mutex, (doBlock ? INFINITE : 0)); |
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switch (res) |
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{ |
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case WAIT_OBJECT_0: |
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case WAIT_OBJECT_0: |
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case WAIT_ABANDONED: |
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case WAIT_ABANDONED: |
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return true; |
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return true; |
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break; |
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case WAIT_TIMEOUT: |
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case WAIT_TIMEOUT: |
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break; |
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return false; |
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default: |
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default: |
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qErrnoWarning("QtLockedFile::lock(): WaitForSingleObject failed"); |
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qErrnoWarning("QtLockedFile::lock(): WaitForSingleObject failed"); |
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break; |
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} |
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} |
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return false; |
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return false; |
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} |
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} |
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bool QtLockedFile::lock(LockMode mode, bool block) |
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bool QtLockedFile::lock(const LockMode mode, const bool block) |
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{ |
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{ |
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if (!isOpen()) { |
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if (!isOpen()) |
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{ |
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qWarning("QtLockedFile::lock(): file is not opened"); |
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qWarning("QtLockedFile::lock(): file is not opened"); |
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return false; |
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return false; |
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} |
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} |
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@ -135,72 +144,85 @@ bool QtLockedFile::lock(LockMode mode, bool block) |
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if (mode == NoLock) |
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if (mode == NoLock) |
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return unlock(); |
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return unlock(); |
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if (mode == m_lock_mode) |
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if (mode == m_lockMode) |
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return true; |
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return true; |
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if (m_lock_mode != NoLock) |
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if (m_lockMode != NoLock) |
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unlock(); |
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unlock(); |
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if (!wmutex && !(wmutex = getMutexHandle(-1, true))) |
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if (!m_writeMutex && !(m_writeMutex = getMutexHandle(-1, true))) |
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return false; |
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return false; |
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if (!waitMutex(wmutex, block)) |
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if (!waitMutex(m_writeMutex, block)) |
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return false; |
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return false; |
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if (mode == ReadLock) { |
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if (mode == ReadLock) |
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{ |
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int idx = 0; |
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int idx = 0; |
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for (; idx < MAX_READERS; idx++) { |
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for (; idx < MAX_READERS; ++idx) |
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rmutex = getMutexHandle(idx, false); |
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{ |
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if (!rmutex || waitMutex(rmutex, false)) |
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m_readMutex = getMutexHandle(idx, false); |
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if (!m_readMutex || waitMutex(m_readMutex, false)) |
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break; |
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break; |
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CloseHandle(rmutex); |
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::CloseHandle(m_readMutex); |
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} |
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} |
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bool ok = true; |
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bool ok = true; |
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if (idx >= MAX_READERS) { |
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if (idx >= MAX_READERS) |
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{ |
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qWarning("QtLockedFile::lock(): too many readers"); |
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qWarning("QtLockedFile::lock(): too many readers"); |
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rmutex = 0; |
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m_readMutex = nullptr; |
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ok = false; |
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ok = false; |
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} |
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} |
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else if (!rmutex) { |
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else if (!m_readMutex) |
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rmutex = getMutexHandle(idx, true); |
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{ |
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if (!rmutex || !waitMutex(rmutex, false)) |
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m_readMutex = getMutexHandle(idx, true); |
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if (!m_readMutex || !waitMutex(m_readMutex, false)) |
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ok = false; |
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ok = false; |
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} |
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} |
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if (!ok && rmutex) { |
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CloseHandle(rmutex); |
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if (!ok && m_readMutex) |
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rmutex = 0; |
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{ |
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::CloseHandle(m_readMutex); |
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m_readMutex = nullptr; |
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} |
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} |
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ReleaseMutex(wmutex); |
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::ReleaseMutex(m_writeMutex); |
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if (!ok) |
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if (!ok) |
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return false; |
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return false; |
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} |
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} |
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else { |
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else |
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Q_ASSERT(rmutexes.isEmpty()); |
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{ |
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for (int i = 0; i < MAX_READERS; i++) { |
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Q_ASSERT(m_readMutexes.isEmpty()); |
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Qt::HANDLE mutex = getMutexHandle(i, false); |
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for (int i = 0; i < MAX_READERS; ++i) |
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{ |
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const Qt::HANDLE mutex = getMutexHandle(i, false); |
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if (mutex) |
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if (mutex) |
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rmutexes.append(mutex); |
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m_readMutexes.append(mutex); |
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} |
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} |
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if (rmutexes.size()) { |
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if (m_readMutexes.size()) |
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DWORD res = WaitForMultipleObjects(rmutexes.size(), rmutexes.constData(), |
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{ |
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TRUE, block ? INFINITE : 0); |
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const DWORD res = ::WaitForMultipleObjects(m_readMutexes.size(), m_readMutexes.constData(), |
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if (res != WAIT_OBJECT_0 && res != WAIT_ABANDONED) { |
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TRUE, (block ? INFINITE : 0)); |
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if ((res != WAIT_OBJECT_0) && (res != WAIT_ABANDONED)) |
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{ |
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if (res != WAIT_TIMEOUT) |
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if (res != WAIT_TIMEOUT) |
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qErrnoWarning("QtLockedFile::lock(): WaitForMultipleObjects failed"); |
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qErrnoWarning("QtLockedFile::lock(): WaitForMultipleObjects failed"); |
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m_lock_mode = WriteLock; // trick unlock() to clean up - semiyucky
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m_lockMode = WriteLock; // trick unlock() to clean up - semiyucky
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unlock(); |
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unlock(); |
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return false; |
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return false; |
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} |
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} |
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} |
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} |
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} |
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} |
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m_lock_mode = mode; |
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m_lockMode = mode; |
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return true; |
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return true; |
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} |
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} |
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bool QtLockedFile::unlock() |
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bool QtLockedFile::unlock() |
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{ |
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{ |
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if (!isOpen()) { |
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if (!isOpen()) |
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{ |
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qWarning("QtLockedFile::unlock(): file is not opened"); |
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qWarning("QtLockedFile::unlock(): file is not opened"); |
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return false; |
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return false; |
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} |
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} |
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@ -208,21 +230,24 @@ bool QtLockedFile::unlock() |
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if (!isLocked()) |
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if (!isLocked()) |
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return true; |
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return true; |
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if (m_lock_mode == ReadLock) { |
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if (m_lockMode == ReadLock) |
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ReleaseMutex(rmutex); |
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{ |
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CloseHandle(rmutex); |
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::ReleaseMutex(m_readMutex); |
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rmutex = 0; |
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::CloseHandle(m_readMutex); |
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m_readMutex = nullptr; |
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} |
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} |
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else { |
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else |
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foreach(Qt::HANDLE mutex, rmutexes) { |
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{ |
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ReleaseMutex(mutex); |
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for (const Qt::HANDLE &mutex : asConst(m_readMutexes)) |
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CloseHandle(mutex); |
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{ |
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::ReleaseMutex(mutex); |
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::CloseHandle(mutex); |
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} |
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} |
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rmutexes.clear(); |
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m_readMutexes.clear(); |
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ReleaseMutex(wmutex); |
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::ReleaseMutex(m_writeMutex); |
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} |
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} |
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m_lock_mode = QtLockedFile::NoLock; |
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m_lockMode = QtLockedFile::NoLock; |
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return true; |
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return true; |
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} |
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} |
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@ -230,6 +255,6 @@ QtLockedFile::~QtLockedFile() |
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{ |
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{ |
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if (isOpen()) |
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if (isOpen()) |
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unlock(); |
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unlock(); |
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if (wmutex) |
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if (m_writeMutex) |
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CloseHandle(wmutex); |
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::CloseHandle(m_writeMutex); |
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} |
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} |
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