#include "qtlocalpeer.h"
-#include <QtCore/QCoreApplication>
-#include <QtCore/QTime>
+#include <QCoreApplication>
+#include <QTime>
#if defined(Q_OS_WIN)
-#include <QtCore/QLibrary>
-#include <QtCore/qt_windows.h>
+#include <QLibrary>
+#include <qt_windows.h>
typedef BOOL(WINAPI*PProcessIdToSessionId)(DWORD,DWORD*);
static PProcessIdToSessionId pProcessIdToSessionId = 0;
#endif
const char* QtLocalPeer::ack = "ack";
QtLocalPeer::QtLocalPeer(QObject* parent, const QString &appId)
- : QObject(parent), id(appId)
+ : QObject(parent), id(appId)
{
- QString prefix = id;
- if (id.isEmpty()) {
- id = QCoreApplication::applicationFilePath();
+ QString prefix = id;
+ if (id.isEmpty()) {
+ id = QCoreApplication::applicationFilePath();
#if defined(Q_OS_WIN)
- id = id.toLower();
+ id = id.toLower();
#endif
- prefix = id.section(QLatin1Char('/'), -1);
- }
- prefix.remove(QRegExp("[^a-zA-Z]"));
- prefix.truncate(6);
+ prefix = id.section(QLatin1Char('/'), -1);
+ }
+ prefix.remove(QRegExp("[^a-zA-Z]"));
+ prefix.truncate(6);
- QByteArray idc = id.toUtf8();
- quint16 idNum = qChecksum(idc.constData(), idc.size());
- socketName = QLatin1String("qtsingleapp-") + prefix
- + QLatin1Char('-') + QString::number(idNum, 16);
+ QByteArray idc = id.toUtf8();
+ quint16 idNum = qChecksum(idc.constData(), idc.size());
+ socketName = QLatin1String("qtsingleapp-") + prefix
+ + QLatin1Char('-') + QString::number(idNum, 16);
#if defined(Q_OS_WIN)
- if (!pProcessIdToSessionId) {
- QLibrary lib("kernel32");
- pProcessIdToSessionId = (PProcessIdToSessionId)lib.resolve("ProcessIdToSessionId");
- }
- if (pProcessIdToSessionId) {
- DWORD sessionId = 0;
- pProcessIdToSessionId(GetCurrentProcessId(), &sessionId);
- socketName += QLatin1Char('-') + QString::number(sessionId, 16);
- }
+ if (!pProcessIdToSessionId) {
+ QLibrary lib("kernel32");
+ pProcessIdToSessionId = (PProcessIdToSessionId)lib.resolve("ProcessIdToSessionId");
+ }
+ if (pProcessIdToSessionId) {
+ DWORD sessionId = 0;
+ pProcessIdToSessionId(GetCurrentProcessId(), &sessionId);
+ socketName += QLatin1Char('-') + QString::number(sessionId, 16);
+ }
#else
- socketName += QLatin1Char('-') + QString::number(::getuid(), 16);
+ socketName += QLatin1Char('-') + QString::number(::getuid(), 16);
#endif
- server = new QLocalServer(this);
- QString lockName = QDir(QDir::tempPath()).absolutePath()
- + QLatin1Char('/') + socketName
- + QLatin1String("-lockfile");
- lockFile.setFileName(lockName);
- lockFile.open(QIODevice::ReadWrite);
+ server = new QLocalServer(this);
+ QString lockName = QDir(QDir::tempPath()).absolutePath()
+ + QLatin1Char('/') + socketName
+ + QLatin1String("-lockfile");
+ lockFile.setFileName(lockName);
+ lockFile.open(QIODevice::ReadWrite);
}
bool QtLocalPeer::isClient()
{
- if (lockFile.isLocked())
- return false;
+ if (lockFile.isLocked())
+ return false;
- if (!lockFile.lock(QtLP_Private::QtLockedFile::WriteLock, false))
- return true;
+ if (!lockFile.lock(QtLP_Private::QtLockedFile::WriteLock, false))
+ return true;
- bool res = server->listen(socketName);
+ bool res = server->listen(socketName);
#if defined(Q_OS_UNIX) && (QT_VERSION >= QT_VERSION_CHECK(4,5,0))
- // ### Workaround
- if (!res && server->serverError() == QAbstractSocket::AddressInUseError) {
- QFile::remove(QDir::cleanPath(QDir::tempPath())+QLatin1Char('/')+socketName);
- res = server->listen(socketName);
- }
+ // ### Workaround
+ if (!res && server->serverError() == QAbstractSocket::AddressInUseError) {
+ QFile::remove(QDir::cleanPath(QDir::tempPath())+QLatin1Char('/')+socketName);
+ res = server->listen(socketName);
+ }
#endif
- if (!res)
- qWarning("QtSingleCoreApplication: listen on local socket failed, %s", qPrintable(server->errorString()));
- QObject::connect(server, SIGNAL(newConnection()), SLOT(receiveConnection()));
- return false;
+ if (!res)
+ qWarning("QtSingleCoreApplication: listen on local socket failed, %s", qPrintable(server->errorString()));
+ QObject::connect(server, SIGNAL(newConnection()), SLOT(receiveConnection()));
+ return false;
}
bool QtLocalPeer::sendMessage(const QString &message, int timeout)
{
- if (!isClient())
- return false;
-
- QLocalSocket socket;
- bool connOk = false;
- for(int i = 0; i < 2; i++) {
- // Try twice, in case the other instance is just starting up
- socket.connectToServer(socketName);
- connOk = socket.waitForConnected(timeout/2);
- if (connOk || i)
- break;
- int ms = 250;
+ if (!isClient())
+ return false;
+
+ QLocalSocket socket;
+ bool connOk = false;
+ for(int i = 0; i < 2; i++) {
+ // Try twice, in case the other instance is just starting up
+ socket.connectToServer(socketName);
+ connOk = socket.waitForConnected(timeout/2);
+ if (connOk || i)
+ break;
+ int ms = 250;
#if defined(Q_OS_WIN)
- Sleep(DWORD(ms));
+ Sleep(DWORD(ms));
#else
- struct timespec ts = { ms / 1000, (ms % 1000) * 1000 * 1000 };
- nanosleep(&ts, NULL);
+ struct timespec ts = { ms / 1000, (ms % 1000) * 1000 * 1000 };
+ nanosleep(&ts, NULL);
#endif
- }
- if (!connOk)
- return false;
-
- QByteArray uMsg(message.toUtf8());
- QDataStream ds(&socket);
- ds.writeBytes(uMsg.constData(), uMsg.size());
- bool res = socket.waitForBytesWritten(timeout);
- if (res) {
- res &= socket.waitForReadyRead(timeout); // wait for ack
- if (res)
- res &= (socket.read(qstrlen(ack)) == ack);
- }
- return res;
+ }
+ if (!connOk)
+ return false;
+
+ QByteArray uMsg(message.toUtf8());
+ QDataStream ds(&socket);
+ ds.writeBytes(uMsg.constData(), uMsg.size());
+ bool res = socket.waitForBytesWritten(timeout);
+ if (res) {
+ res &= socket.waitForReadyRead(timeout); // wait for ack
+ if (res)
+ res &= (socket.read(qstrlen(ack)) == ack);
+ }
+ return res;
}
void QtLocalPeer::receiveConnection()
{
- QLocalSocket* socket = server->nextPendingConnection();
- if (!socket)
- return;
-
- while (socket->bytesAvailable() < (int)sizeof(quint32))
- socket->waitForReadyRead();
- QDataStream ds(socket);
- QByteArray uMsg;
- quint32 remaining;
- ds >> remaining;
- uMsg.resize(remaining);
- int got = 0;
- char* uMsgBuf = uMsg.data();
- do {
- got = ds.readRawData(uMsgBuf, remaining);
- remaining -= got;
- uMsgBuf += got;
- } while (remaining && got >= 0 && socket->waitForReadyRead(2000));
- if (got < 0) {
- qWarning("QtLocalPeer: Message reception failed %s", socket->errorString().toLatin1().constData());
- delete socket;
- return;
- }
- QString message(QString::fromUtf8(uMsg));
- socket->write(ack, qstrlen(ack));
- socket->waitForBytesWritten(1000);
- delete socket;
- emit messageReceived(message); //### (might take a long time to return)
+ QLocalSocket* socket = server->nextPendingConnection();
+ if (!socket)
+ return;
+
+ while (socket->bytesAvailable() < (int)sizeof(quint32))
+ socket->waitForReadyRead();
+ QDataStream ds(socket);
+ QByteArray uMsg;
+ quint32 remaining;
+ ds >> remaining;
+ uMsg.resize(remaining);
+ int got = 0;
+ char* uMsgBuf = uMsg.data();
+ do {
+ got = ds.readRawData(uMsgBuf, remaining);
+ remaining -= got;
+ uMsgBuf += got;
+ } while (remaining && got >= 0 && socket->waitForReadyRead(2000));
+ if (got < 0) {
+ qWarning("QtLocalPeer: Message reception failed %s", socket->errorString().toLatin1().constData());
+ delete socket;
+ return;
+ }
+ QString message(QString::fromUtf8(uMsg));
+ socket->write(ack, qstrlen(ack));
+ socket->waitForBytesWritten(1000);
+ delete socket;
+ emit messageReceived(message); //### (might take a long time to return)
}
#ifndef QTLOCALPEER_H
#define QTLOCALPEER_H
-#include <QtNetwork/QLocalServer>
-#include <QtNetwork/QLocalSocket>
-#include <QtCore/QDir>
+#include <QLocalServer>
+#include <QLocalSocket>
+#include <QDir>
#include "qtlockedfile.h"
class QtLocalPeer : public QObject
{
- Q_OBJECT
+ Q_OBJECT
public:
- QtLocalPeer(QObject *parent = 0, const QString &appId = QString());
- bool isClient();
- bool sendMessage(const QString &message, int timeout);
- QString applicationId() const
- { return id; }
+ QtLocalPeer(QObject *parent = 0, const QString &appId = QString());
+ bool isClient();
+ bool sendMessage(const QString &message, int timeout);
+ QString applicationId() const
+ { return id; }
Q_SIGNALS:
- void messageReceived(const QString &message);
+ void messageReceived(const QString &message);
protected Q_SLOTS:
- void receiveConnection();
+ void receiveConnection();
protected:
- QString id;
- QString socketName;
- QLocalServer* server;
- QtLP_Private::QtLockedFile lockFile;
+ QString id;
+ QString socketName;
+ QLocalServer* server;
+ QtLP_Private::QtLockedFile lockFile;
private:
- static const char* ack;
+ static const char* ack;
};
#endif // QTLOCALPEER_H
#include "qtlockedfile.h"
/*!
- \class QtLockedFile
-
- \brief The QtLockedFile class extends QFile with advisory locking
- functions.
-
- A file may be locked in read or write mode. Multiple instances of
- \e QtLockedFile, created in multiple processes running on the same
- machine, may have a file locked in read mode. Exactly one instance
- may have it locked in write mode. A read and a write lock cannot
- exist simultaneously on the same file.
-
- The file locks are advisory. This means that nothing prevents
- another process from manipulating a locked file using QFile or
- file system functions offered by the OS. Serialization is only
- guaranteed if all processes that access the file use
- QLockedFile. Also, while holding a lock on a file, a process
- must not open the same file again (through any API), or locks
- can be unexpectedly lost.
-
- The lock provided by an instance of \e QtLockedFile is released
- whenever the program terminates. This is true even when the
- program crashes and no destructors are called.
+ \class QtLockedFile
+
+ \brief The QtLockedFile class extends QFile with advisory locking
+ functions.
+
+ A file may be locked in read or write mode. Multiple instances of
+ \e QtLockedFile, created in multiple processes running on the same
+ machine, may have a file locked in read mode. Exactly one instance
+ may have it locked in write mode. A read and a write lock cannot
+ exist simultaneously on the same file.
+
+ The file locks are advisory. This means that nothing prevents
+ another process from manipulating a locked file using QFile or
+ file system functions offered by the OS. Serialization is only
+ guaranteed if all processes that access the file use
+ QLockedFile. Also, while holding a lock on a file, a process
+ must not open the same file again (through any API), or locks
+ can be unexpectedly lost.
+
+ The lock provided by an instance of \e QtLockedFile is released
+ whenever the program terminates. This is true even when the
+ program crashes and no destructors are called.
*/
/*! \enum QtLockedFile::LockMode
- This enum describes the available lock modes.
+ This enum describes the available lock modes.
- \value ReadLock A read lock.
- \value WriteLock A write lock.
- \value NoLock Neither a read lock nor a write lock.
+ \value ReadLock A read lock.
+ \value WriteLock A write lock.
+ \value NoLock Neither a read lock nor a write lock.
*/
/*!
- Constructs an unlocked \e QtLockedFile object. This constructor
- behaves in the same way as \e QFile::QFile().
+ Constructs an unlocked \e QtLockedFile object. This constructor
+ behaves in the same way as \e QFile::QFile().
- \sa QFile::QFile()
+ \sa QFile::QFile()
*/
QtLockedFile::QtLockedFile()
- : QFile()
+ : QFile()
{
#ifdef Q_OS_WIN
- wmutex = 0;
- rmutex = 0;
+ wmutex = 0;
+ rmutex = 0;
#endif
- m_lock_mode = NoLock;
+ m_lock_mode = NoLock;
}
/*!
- Constructs an unlocked QtLockedFile object with file \a name. This
- constructor behaves in the same way as \e QFile::QFile(const
- QString&).
+ Constructs an unlocked QtLockedFile object with file \a name. This
+ constructor behaves in the same way as \e QFile::QFile(const
+ QString&).
- \sa QFile::QFile()
+ \sa QFile::QFile()
*/
QtLockedFile::QtLockedFile(const QString &name)
- : QFile(name)
+ : QFile(name)
{
#ifdef Q_OS_WIN
- wmutex = 0;
- rmutex = 0;
+ wmutex = 0;
+ rmutex = 0;
#endif
- m_lock_mode = NoLock;
+ m_lock_mode = NoLock;
}
/*!
*/
bool QtLockedFile::open(OpenMode mode)
{
- if (mode & QIODevice::Truncate) {
- qWarning("QtLockedFile::open(): Truncate mode not allowed.");
- return false;
- }
- return QFile::open(mode);
+ if (mode & QIODevice::Truncate) {
+ qWarning("QtLockedFile::open(): Truncate mode not allowed.");
+ return false;
+ }
+ return QFile::open(mode);
}
/*!
- Returns \e true if this object has a in read or write lock;
- otherwise returns \e false.
+ Returns \e true if this object has a in read or write lock;
+ otherwise returns \e false.
- \sa lockMode()
+ \sa lockMode()
*/
bool QtLockedFile::isLocked() const
{
- return m_lock_mode != NoLock;
+ return m_lock_mode != NoLock;
}
/*!
- Returns the type of lock currently held by this object, or \e
- QtLockedFile::NoLock.
+ Returns the type of lock currently held by this object, or \e
+ QtLockedFile::NoLock.
- \sa isLocked()
+ \sa isLocked()
*/
QtLockedFile::LockMode QtLockedFile::lockMode() const
{
- return m_lock_mode;
+ return m_lock_mode;
}
/*!
- \fn bool QtLockedFile::lock(LockMode mode, bool block = true)
+ \fn bool QtLockedFile::lock(LockMode mode, bool block = true)
- Obtains a lock of type \a mode. The file must be opened before it
- can be locked.
+ Obtains a lock of type \a mode. The file must be opened before it
+ can be locked.
- If \a block is true, this function will block until the lock is
- aquired. If \a block is false, this function returns \e false
- immediately if the lock cannot be aquired.
+ If \a block is true, this function will block until the lock is
+ aquired. If \a block is false, this function returns \e false
+ immediately if the lock cannot be aquired.
- If this object already has a lock of type \a mode, this function
- returns \e true immediately. If this object has a lock of a
- different type than \a mode, the lock is first released and then a
- new lock is obtained.
+ If this object already has a lock of type \a mode, this function
+ returns \e true immediately. If this object has a lock of a
+ different type than \a mode, the lock is first released and then a
+ new lock is obtained.
- This function returns \e true if, after it executes, the file is
- locked by this object, and \e false otherwise.
+ This function returns \e true if, after it executes, the file is
+ locked by this object, and \e false otherwise.
- \sa unlock(), isLocked(), lockMode()
+ \sa unlock(), isLocked(), lockMode()
*/
/*!
- \fn bool QtLockedFile::unlock()
+ \fn bool QtLockedFile::unlock()
- Releases a lock.
+ Releases a lock.
- If the object has no lock, this function returns immediately.
+ If the object has no lock, this function returns immediately.
- This function returns \e true if, after it executes, the file is
- not locked by this object, and \e false otherwise.
+ This function returns \e true if, after it executes, the file is
+ not locked by this object, and \e false otherwise.
- \sa lock(), isLocked(), lockMode()
+ \sa lock(), isLocked(), lockMode()
*/
/*!
- \fn QtLockedFile::~QtLockedFile()
+ \fn QtLockedFile::~QtLockedFile()
- Destroys the \e QtLockedFile object. If any locks were held, they
- are released.
+ Destroys the \e QtLockedFile object. If any locks were held, they
+ are released.
*/
#ifndef QTLOCKEDFILE_H
#define QTLOCKEDFILE_H
-#include <QtCore/QFile>
+#include <QFile>
#ifdef Q_OS_WIN
-#include <QtCore/QVector>
+#include <QVector>
#endif
#if defined(Q_WS_WIN)
class QT_QTLOCKEDFILE_EXPORT QtLockedFile : public QFile
{
public:
- enum LockMode { NoLock = 0, ReadLock, WriteLock };
+ enum LockMode { NoLock = 0, ReadLock, WriteLock };
- QtLockedFile();
- QtLockedFile(const QString &name);
- ~QtLockedFile();
+ QtLockedFile();
+ QtLockedFile(const QString &name);
+ ~QtLockedFile();
- bool open(OpenMode mode);
+ bool open(OpenMode mode);
- bool lock(LockMode mode, bool block = true);
- bool unlock();
- bool isLocked() const;
- LockMode lockMode() const;
+ bool lock(LockMode mode, bool block = true);
+ bool unlock();
+ bool isLocked() const;
+ LockMode lockMode() const;
private:
#ifdef Q_OS_WIN
- Qt::HANDLE wmutex;
- Qt::HANDLE rmutex;
- QVector<Qt::HANDLE> rmutexes;
- QString mutexname;
+ Qt::HANDLE wmutex;
+ Qt::HANDLE rmutex;
+ QVector<Qt::HANDLE> rmutexes;
+ QString mutexname;
- Qt::HANDLE getMutexHandle(int idx, bool doCreate);
- bool waitMutex(Qt::HANDLE mutex, bool doBlock);
+ Qt::HANDLE getMutexHandle(int idx, bool doCreate);
+ bool waitMutex(Qt::HANDLE mutex, bool doBlock);
#endif
- LockMode m_lock_mode;
+ LockMode m_lock_mode;
};
}
#endif
Qt::HANDLE QtLockedFile::getMutexHandle(int idx, bool doCreate)
{
- if (mutexname.isEmpty()) {
- QFileInfo fi(*this);
- mutexname = QString::fromLatin1(MUTEX_PREFIX)
- + fi.absoluteFilePath().toLower();
- }
- QString mname(mutexname);
- if (idx >= 0)
- mname += QString::number(idx);
-
- Qt::HANDLE mutex;
- if (doCreate) {
- QT_WA( { mutex = CreateMutexW(NULL, FALSE, (TCHAR*)mname.utf16()); },
- { mutex = CreateMutexA(NULL, FALSE, mname.toLocal8Bit().constData()); } );
- if (!mutex) {
- qErrnoWarning("QtLockedFile::lock(): CreateMutex failed");
- return 0;
- }
- }
- else {
- QT_WA( { mutex = OpenMutexW(SYNCHRONIZE | MUTEX_MODIFY_STATE, FALSE, (TCHAR*)mname.utf16()); },
- { mutex = OpenMutexA(SYNCHRONIZE | MUTEX_MODIFY_STATE, FALSE, mname.toLocal8Bit().constData()); } );
- if (!mutex) {
- if (GetLastError() != ERROR_FILE_NOT_FOUND)
- qErrnoWarning("QtLockedFile::lock(): OpenMutex failed");
- return 0;
- }
- }
- return mutex;
+ if (mutexname.isEmpty()) {
+ QFileInfo fi(*this);
+ mutexname = QString::fromLatin1(MUTEX_PREFIX)
+ + fi.absoluteFilePath().toLower();
+ }
+ QString mname(mutexname);
+ if (idx >= 0)
+ mname += QString::number(idx);
+
+ Qt::HANDLE mutex;
+ if (doCreate) {
+ mutex = CreateMutexW(NULL, FALSE, (TCHAR*)mname.utf16());
+ if (!mutex) {
+ qErrnoWarning("QtLockedFile::lock(): CreateMutex failed");
+ return 0;
+ }
+ }
+ else {
+ mutex = OpenMutexW(SYNCHRONIZE | MUTEX_MODIFY_STATE, FALSE, (TCHAR*)mname.utf16());
+ if (!mutex) {
+ if (GetLastError() != ERROR_FILE_NOT_FOUND)
+ qErrnoWarning("QtLockedFile::lock(): OpenMutex failed");
+ return 0;
+ }
+ }
+ return mutex;
}
bool QtLockedFile::waitMutex(Qt::HANDLE mutex, bool doBlock)
{
- Q_ASSERT(mutex);
- DWORD res = WaitForSingleObject(mutex, doBlock ? INFINITE : 0);
- switch (res) {
- case WAIT_OBJECT_0:
- case WAIT_ABANDONED:
- return true;
- break;
- case WAIT_TIMEOUT:
- break;
- default:
- qErrnoWarning("QtLockedFile::lock(): WaitForSingleObject failed");
- }
- return false;
+ Q_ASSERT(mutex);
+ DWORD res = WaitForSingleObject(mutex, doBlock ? INFINITE : 0);
+ switch (res) {
+ case WAIT_OBJECT_0:
+ case WAIT_ABANDONED:
+ return true;
+ break;
+ case WAIT_TIMEOUT:
+ break;
+ default:
+ qErrnoWarning("QtLockedFile::lock(): WaitForSingleObject failed");
+ }
+ return false;
}
bool QtLockedFile::lock(LockMode mode, bool block)
{
- if (!isOpen()) {
- qWarning("QtLockedFile::lock(): file is not opened");
- return false;
- }
-
- if (mode == NoLock)
- return unlock();
-
- if (mode == m_lock_mode)
- return true;
-
- if (m_lock_mode != NoLock)
- unlock();
-
- if (!wmutex && !(wmutex = getMutexHandle(-1, true)))
- return false;
-
- if (!waitMutex(wmutex, block))
- return false;
-
- if (mode == ReadLock) {
- int idx = 0;
- for (; idx < MAX_READERS; idx++) {
- rmutex = getMutexHandle(idx, false);
- if (!rmutex || waitMutex(rmutex, false))
- break;
- CloseHandle(rmutex);
- }
- bool ok = true;
- if (idx >= MAX_READERS) {
- qWarning("QtLockedFile::lock(): too many readers");
- rmutex = 0;
- ok = false;
- }
- else if (!rmutex) {
- rmutex = getMutexHandle(idx, true);
- if (!rmutex || !waitMutex(rmutex, false))
- ok = false;
- }
- if (!ok && rmutex) {
- CloseHandle(rmutex);
- rmutex = 0;
- }
- ReleaseMutex(wmutex);
- if (!ok)
- return false;
- }
- else {
- Q_ASSERT(rmutexes.isEmpty());
- for (int i = 0; i < MAX_READERS; i++) {
- Qt::HANDLE mutex = getMutexHandle(i, false);
- if (mutex)
- rmutexes.append(mutex);
- }
- if (rmutexes.size()) {
- DWORD res = WaitForMultipleObjects(rmutexes.size(), rmutexes.constData(),
- TRUE, block ? INFINITE : 0);
- if (res != WAIT_OBJECT_0 && res != WAIT_ABANDONED) {
- if (res != WAIT_TIMEOUT)
- qErrnoWarning("QtLockedFile::lock(): WaitForMultipleObjects failed");
- m_lock_mode = WriteLock; // trick unlock() to clean up - semiyucky
- unlock();
- return false;
- }
- }
- }
-
- m_lock_mode = mode;
- return true;
+ if (!isOpen()) {
+ qWarning("QtLockedFile::lock(): file is not opened");
+ return false;
+ }
+
+ if (mode == NoLock)
+ return unlock();
+
+ if (mode == m_lock_mode)
+ return true;
+
+ if (m_lock_mode != NoLock)
+ unlock();
+
+ if (!wmutex && !(wmutex = getMutexHandle(-1, true)))
+ return false;
+
+ if (!waitMutex(wmutex, block))
+ return false;
+
+ if (mode == ReadLock) {
+ int idx = 0;
+ for (; idx < MAX_READERS; idx++) {
+ rmutex = getMutexHandle(idx, false);
+ if (!rmutex || waitMutex(rmutex, false))
+ break;
+ CloseHandle(rmutex);
+ }
+ bool ok = true;
+ if (idx >= MAX_READERS) {
+ qWarning("QtLockedFile::lock(): too many readers");
+ rmutex = 0;
+ ok = false;
+ }
+ else if (!rmutex) {
+ rmutex = getMutexHandle(idx, true);
+ if (!rmutex || !waitMutex(rmutex, false))
+ ok = false;
+ }
+ if (!ok && rmutex) {
+ CloseHandle(rmutex);
+ rmutex = 0;
+ }
+ ReleaseMutex(wmutex);
+ if (!ok)
+ return false;
+ }
+ else {
+ Q_ASSERT(rmutexes.isEmpty());
+ for (int i = 0; i < MAX_READERS; i++) {
+ Qt::HANDLE mutex = getMutexHandle(i, false);
+ if (mutex)
+ rmutexes.append(mutex);
+ }
+ if (rmutexes.size()) {
+ DWORD res = WaitForMultipleObjects(rmutexes.size(), rmutexes.constData(),
+ TRUE, block ? INFINITE : 0);
+ if (res != WAIT_OBJECT_0 && res != WAIT_ABANDONED) {
+ if (res != WAIT_TIMEOUT)
+ qErrnoWarning("QtLockedFile::lock(): WaitForMultipleObjects failed");
+ m_lock_mode = WriteLock; // trick unlock() to clean up - semiyucky
+ unlock();
+ return false;
+ }
+ }
+ }
+
+ m_lock_mode = mode;
+ return true;
}
bool QtLockedFile::unlock()
{
- if (!isOpen()) {
- qWarning("QtLockedFile::unlock(): file is not opened");
- return false;
- }
-
- if (!isLocked())
- return true;
-
- if (m_lock_mode == ReadLock) {
- ReleaseMutex(rmutex);
- CloseHandle(rmutex);
- rmutex = 0;
- }
- else {
- foreach(Qt::HANDLE mutex, rmutexes) {
- ReleaseMutex(mutex);
- CloseHandle(mutex);
- }
- rmutexes.clear();
- ReleaseMutex(wmutex);
- }
-
- m_lock_mode = QtLockedFile::NoLock;
- return true;
+ if (!isOpen()) {
+ qWarning("QtLockedFile::unlock(): file is not opened");
+ return false;
+ }
+
+ if (!isLocked())
+ return true;
+
+ if (m_lock_mode == ReadLock) {
+ ReleaseMutex(rmutex);
+ CloseHandle(rmutex);
+ rmutex = 0;
+ }
+ else {
+ foreach(Qt::HANDLE mutex, rmutexes) {
+ ReleaseMutex(mutex);
+ CloseHandle(mutex);
+ }
+ rmutexes.clear();
+ ReleaseMutex(wmutex);
+ }
+
+ m_lock_mode = QtLockedFile::NoLock;
+ return true;
}
QtLockedFile::~QtLockedFile()
{
- if (isOpen())
- unlock();
- if (wmutex)
- CloseHandle(wmutex);
+ if (isOpen())
+ unlock();
+ if (wmutex)
+ CloseHandle(wmutex);
}
#include "qtsingleapplication.h"
#include "qtlocalpeer.h"
-#include <QtGui/QWidget>
+#include <QWidget>
/*!
- \class QtSingleApplication qtsingleapplication.h
- \brief The QtSingleApplication class provides an API to detect and
- communicate with running instances of an application.
-
- This class allows you to create applications where only one
- instance should be running at a time. I.e., if the user tries to
- launch another instance, the already running instance will be
- activated instead. Another usecase is a client-server system,
- where the first started instance will assume the role of server,
- and the later instances will act as clients of that server.
-
- By default, the full path of the executable file is used to
- determine whether two processes are instances of the same
- application. You can also provide an explicit identifier string
- that will be compared instead.
-
- The application should create the QtSingleApplication object early
- in the startup phase, and call isRunning() to find out if another
- instance of this application is already running. If isRunning()
- returns false, it means that no other instance is running, and
- this instance has assumed the role as the running instance. In
- this case, the application should continue with the initialization
- of the application user interface before entering the event loop
- with exec(), as normal.
-
- The messageReceived() signal will be emitted when the running
- application receives messages from another instance of the same
- application. When a message is received it might be helpful to the
- user to raise the application so that it becomes visible. To
- facilitate this, QtSingleApplication provides the
- setActivationWindow() function and the activateWindow() slot.
-
- If isRunning() returns true, another instance is already
- running. It may be alerted to the fact that another instance has
- started by using the sendMessage() function. Also data such as
- startup parameters (e.g. the name of the file the user wanted this
- new instance to open) can be passed to the running instance with
- this function. Then, the application should terminate (or enter
- client mode).
-
- If isRunning() returns true, but sendMessage() fails, that is an
- indication that the running instance is frozen.
-
- Here's an example that shows how to convert an existing
- application to use QtSingleApplication. It is very simple and does
- not make use of all QtSingleApplication's functionality (see the
- examples for that).
-
- \code
- // Original
- int main(int argc, char **argv)
- {
- QApplication app(argc, argv);
-
- MyMainWidget mmw;
- mmw.show();
- return app.exec();
- }
-
- // Single instance
- int main(int argc, char **argv)
- {
- QtSingleApplication app(argc, argv);
-
- if (app.isRunning())
- return !app.sendMessage(someDataString);
-
- MyMainWidget mmw;
- app.setActivationWindow(&mmw);
- mmw.show();
- return app.exec();
- }
- \endcode
-
- Once this QtSingleApplication instance is destroyed (normally when
- the process exits or crashes), when the user next attempts to run the
- application this instance will not, of course, be encountered. The
- next instance to call isRunning() or sendMessage() will assume the
- role as the new running instance.
-
- For console (non-GUI) applications, QtSingleCoreApplication may be
- used instead of this class, to avoid the dependency on the QtGui
- library.
-
- \sa QtSingleCoreApplication
+ \class QtSingleApplication qtsingleapplication.h
+ \brief The QtSingleApplication class provides an API to detect and
+ communicate with running instances of an application.
+
+ This class allows you to create applications where only one
+ instance should be running at a time. I.e., if the user tries to
+ launch another instance, the already running instance will be
+ activated instead. Another usecase is a client-server system,
+ where the first started instance will assume the role of server,
+ and the later instances will act as clients of that server.
+
+ By default, the full path of the executable file is used to
+ determine whether two processes are instances of the same
+ application. You can also provide an explicit identifier string
+ that will be compared instead.
+
+ The application should create the QtSingleApplication object early
+ in the startup phase, and call isRunning() to find out if another
+ instance of this application is already running. If isRunning()
+ returns false, it means that no other instance is running, and
+ this instance has assumed the role as the running instance. In
+ this case, the application should continue with the initialization
+ of the application user interface before entering the event loop
+ with exec(), as normal.
+
+ The messageReceived() signal will be emitted when the running
+ application receives messages from another instance of the same
+ application. When a message is received it might be helpful to the
+ user to raise the application so that it becomes visible. To
+ facilitate this, QtSingleApplication provides the
+ setActivationWindow() function and the activateWindow() slot.
+
+ If isRunning() returns true, another instance is already
+ running. It may be alerted to the fact that another instance has
+ started by using the sendMessage() function. Also data such as
+ startup parameters (e.g. the name of the file the user wanted this
+ new instance to open) can be passed to the running instance with
+ this function. Then, the application should terminate (or enter
+ client mode).
+
+ If isRunning() returns true, but sendMessage() fails, that is an
+ indication that the running instance is frozen.
+
+ Here's an example that shows how to convert an existing
+ application to use QtSingleApplication. It is very simple and does
+ not make use of all QtSingleApplication's functionality (see the
+ examples for that).
+
+ \code
+ // Original
+ int main(int argc, char **argv)
+ {
+ QApplication app(argc, argv);
+
+ MyMainWidget mmw;
+ mmw.show();
+ return app.exec();
+ }
+
+ // Single instance
+ int main(int argc, char **argv)
+ {
+ QtSingleApplication app(argc, argv);
+
+ if (app.isRunning())
+ return !app.sendMessage(someDataString);
+
+ MyMainWidget mmw;
+ app.setActivationWindow(&mmw);
+ mmw.show();
+ return app.exec();
+ }
+ \endcode
+
+ Once this QtSingleApplication instance is destroyed (normally when
+ the process exits or crashes), when the user next attempts to run the
+ application this instance will not, of course, be encountered. The
+ next instance to call isRunning() or sendMessage() will assume the
+ role as the new running instance.
+
+ For console (non-GUI) applications, QtSingleCoreApplication may be
+ used instead of this class, to avoid the dependency on the QtGui
+ library.
+
+ \sa QtSingleCoreApplication
*/
void QtSingleApplication::sysInit(const QString &appId)
{
- actWin = 0;
- peer = new QtLocalPeer(this, appId);
- connect(peer, SIGNAL(messageReceived(const QString&)), SIGNAL(messageReceived(const QString&)));
+ actWin = 0;
+ peer = new QtLocalPeer(this, appId);
+ connect(peer, SIGNAL(messageReceived(const QString&)), SIGNAL(messageReceived(const QString&)));
}
/*!
- Creates a QtSingleApplication object. The application identifier
- will be QCoreApplication::applicationFilePath(). \a argc, \a
- argv, and \a GUIenabled are passed on to the QAppliation constructor.
+ Creates a QtSingleApplication object. The application identifier
+ will be QCoreApplication::applicationFilePath(). \a argc, \a
+ argv, and \a GUIenabled are passed on to the QAppliation constructor.
- If you are creating a console application (i.e. setting \a
- GUIenabled to false), you may consider using
- QtSingleCoreApplication instead.
+ If you are creating a console application (i.e. setting \a
+ GUIenabled to false), you may consider using
+ QtSingleCoreApplication instead.
*/
QtSingleApplication::QtSingleApplication(int &argc, char **argv, bool GUIenabled)
- : QApplication(argc, argv, GUIenabled)
+ : QApplication(argc, argv, GUIenabled)
{
- sysInit();
+ sysInit();
}
/*!
- Creates a QtSingleApplication object with the application
- identifier \a appId. \a argc and \a argv are passed on to the
- QAppliation constructor.
+ Creates a QtSingleApplication object with the application
+ identifier \a appId. \a argc and \a argv are passed on to the
+ QAppliation constructor.
*/
QtSingleApplication::QtSingleApplication(const QString &appId, int &argc, char **argv)
- : QApplication(argc, argv)
+ : QApplication(argc, argv)
{
- sysInit(appId);
+ sysInit(appId);
}
-
-/*!
- Creates a QtSingleApplication object. The application identifier
- will be QCoreApplication::applicationFilePath(). \a argc, \a
- argv, and \a type are passed on to the QAppliation constructor.
-*/
-QtSingleApplication::QtSingleApplication(int &argc, char **argv, Type type)
- : QApplication(argc, argv, type)
-{
- sysInit();
-}
-
-
#if defined(Q_WS_X11)
/*!
Special constructor for X11, ref. the documentation of
and \a cmap are passed on to the QApplication constructor.
*/
QtSingleApplication::QtSingleApplication(Display* dpy, Qt::HANDLE visual, Qt::HANDLE cmap)
- : QApplication(dpy, visual, cmap)
+ : QApplication(dpy, visual, cmap)
{
- sysInit();
+ sysInit();
}
/*!
constructor.
*/
QtSingleApplication::QtSingleApplication(Display *dpy, int &argc, char **argv, Qt::HANDLE visual, Qt::HANDLE cmap)
- : QApplication(dpy, argc, argv, visual, cmap)
+ : QApplication(dpy, argc, argv, visual, cmap)
{
- sysInit();
+ sysInit();
}
/*!
constructor.
*/
QtSingleApplication::QtSingleApplication(Display* dpy, const QString &appId, int argc, char **argv, Qt::HANDLE visual, Qt::HANDLE cmap)
- : QApplication(dpy, argc, argv, visual, cmap)
+ : QApplication(dpy, argc, argv, visual, cmap)
{
- sysInit(appId);
+ sysInit(appId);
}
#endif
/*!
- Returns true if another instance of this application is running;
- otherwise false.
+ Returns true if another instance of this application is running;
+ otherwise false.
- This function does not find instances of this application that are
- being run by a different user (on Windows: that are running in
- another session).
+ This function does not find instances of this application that are
+ being run by a different user (on Windows: that are running in
+ another session).
- \sa sendMessage()
+ \sa sendMessage()
*/
bool QtSingleApplication::isRunning()
{
- return peer->isClient();
+ return peer->isClient();
}
/*!
- Tries to send the text \a message to the currently running
- instance. The QtSingleApplication object in the running instance
- will emit the messageReceived() signal when it receives the
- message.
+ Tries to send the text \a message to the currently running
+ instance. The QtSingleApplication object in the running instance
+ will emit the messageReceived() signal when it receives the
+ message.
- This function returns true if the message has been sent to, and
- processed by, the current instance. If there is no instance
- currently running, or if the running instance fails to process the
- message within \a timeout milliseconds, this function return false.
+ This function returns true if the message has been sent to, and
+ processed by, the current instance. If there is no instance
+ currently running, or if the running instance fails to process the
+ message within \a timeout milliseconds, this function return false.
- \sa isRunning(), messageReceived()
+ \sa isRunning(), messageReceived()
*/
bool QtSingleApplication::sendMessage(const QString &message, int timeout)
{
- return peer->sendMessage(message, timeout);
+ return peer->sendMessage(message, timeout);
}
/*!
- Returns the application identifier. Two processes with the same
- identifier will be regarded as instances of the same application.
+ Returns the application identifier. Two processes with the same
+ identifier will be regarded as instances of the same application.
*/
QString QtSingleApplication::id() const
{
- return peer->applicationId();
+ return peer->applicationId();
}
void QtSingleApplication::setActivationWindow(QWidget* aw, bool activateOnMessage)
{
- actWin = aw;
- if (activateOnMessage)
- connect(peer, SIGNAL(messageReceived(const QString&)), this, SLOT(activateWindow()));
- else
- disconnect(peer, SIGNAL(messageReceived(const QString&)), this, SLOT(activateWindow()));
+ actWin = aw;
+ if (activateOnMessage)
+ connect(peer, SIGNAL(messageReceived(const QString&)), this, SLOT(activateWindow()));
+ else
+ disconnect(peer, SIGNAL(messageReceived(const QString&)), this, SLOT(activateWindow()));
}
/*!
- Returns the applications activation window if one has been set by
- calling setActivationWindow(), otherwise returns 0.
+ Returns the applications activation window if one has been set by
+ calling setActivationWindow(), otherwise returns 0.
- \sa setActivationWindow()
+ \sa setActivationWindow()
*/
QWidget* QtSingleApplication::activationWindow() const
{
- return actWin;
+ return actWin;
}
*/
void QtSingleApplication::activateWindow()
{
- if (actWin) {
- actWin->setWindowState(actWin->windowState() & ~Qt::WindowMinimized);
- actWin->raise();
- actWin->activateWindow();
- }
+ if (actWin) {
+ actWin->setWindowState(actWin->windowState() & ~Qt::WindowMinimized);
+ actWin->raise();
+ actWin->activateWindow();
+ }
}
/*!
- \fn void QtSingleApplication::messageReceived(const QString& message)
+ \fn void QtSingleApplication::messageReceived(const QString& message)
- This signal is emitted when the current instance receives a \a
- message from another instance of this application.
+ This signal is emitted when the current instance receives a \a
+ message from another instance of this application.
- \sa sendMessage(), setActivationWindow(), activateWindow()
+ \sa sendMessage(), setActivationWindow(), activateWindow()
*/
/*!
- \fn void QtSingleApplication::initialize(bool dummy = true)
+ \fn void QtSingleApplication::initialize(bool dummy = true)
- \obsolete
+ \obsolete
*/
#ifndef QTSINGLEAPPLICATION_H
#define QTSINGLEAPPLICATION_H
-#include <QtGui/QApplication>
+#include <QApplication>
class QtLocalPeer;
class QT_QTSINGLEAPPLICATION_EXPORT QtSingleApplication : public QApplication
{
- Q_OBJECT
+ Q_OBJECT
public:
- QtSingleApplication(int &argc, char **argv, bool GUIenabled = true);
- QtSingleApplication(const QString &id, int &argc, char **argv);
- QtSingleApplication(int &argc, char **argv, Type type);
+ QtSingleApplication(int &argc, char **argv, bool GUIenabled = true);
+ QtSingleApplication(const QString &id, int &argc, char **argv);
#if defined(Q_WS_X11)
- QtSingleApplication(Display* dpy, Qt::HANDLE visual = 0, Qt::HANDLE colormap = 0);
- QtSingleApplication(Display *dpy, int &argc, char **argv, Qt::HANDLE visual = 0, Qt::HANDLE cmap= 0);
- QtSingleApplication(Display* dpy, const QString &appId, int argc, char **argv, Qt::HANDLE visual = 0, Qt::HANDLE colormap = 0);
+ QtSingleApplication(Display* dpy, Qt::HANDLE visual = 0, Qt::HANDLE colormap = 0);
+ QtSingleApplication(Display *dpy, int &argc, char **argv, Qt::HANDLE visual = 0, Qt::HANDLE cmap= 0);
+ QtSingleApplication(Display* dpy, const QString &appId, int argc, char **argv, Qt::HANDLE visual = 0, Qt::HANDLE colormap = 0);
#endif
- bool isRunning();
- QString id() const;
+ bool isRunning();
+ QString id() const;
- void setActivationWindow(QWidget* aw, bool activateOnMessage = true);
- QWidget* activationWindow() const;
+ void setActivationWindow(QWidget* aw, bool activateOnMessage = true);
+ QWidget* activationWindow() const;
- // Obsolete:
- void initialize(bool dummy = true)
- { isRunning(); Q_UNUSED(dummy) }
+ // Obsolete:
+ void initialize(bool dummy = true)
+ { isRunning(); Q_UNUSED(dummy) }
public Q_SLOTS:
- bool sendMessage(const QString &message, int timeout = 5000);
- void activateWindow();
+ bool sendMessage(const QString &message, int timeout = 5000);
+ void activateWindow();
Q_SIGNALS:
- void messageReceived(const QString &message);
+ void messageReceived(const QString &message);
private:
- void sysInit(const QString &appId = QString());
- QtLocalPeer *peer;
- QWidget *actWin;
+ void sysInit(const QString &appId = QString());
+ QtLocalPeer *peer;
+ QWidget *actWin;
};
#endif // QTSINGLEAPPLICATION_H
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