diff options
Diffstat (limited to 'tests/auto/corelib/kernel/qtipc/qsharedmemory/src')
6 files changed, 918 insertions, 0 deletions
diff --git a/tests/auto/corelib/kernel/qtipc/qsharedmemory/src/qsystemlock.cpp b/tests/auto/corelib/kernel/qtipc/qsharedmemory/src/qsystemlock.cpp new file mode 100644 index 0000000000..b48bd7bebe --- /dev/null +++ b/tests/auto/corelib/kernel/qtipc/qsharedmemory/src/qsystemlock.cpp @@ -0,0 +1,246 @@ +/**************************************************************************** +** +** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies). +** All rights reserved. +** Contact: Nokia Corporation (qt-info@nokia.com) +** +** This file is part of the test suite of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** GNU Lesser General Public License Usage +** This file may be used under the terms of the GNU Lesser General Public +** License version 2.1 as published by the Free Software Foundation and +** appearing in the file LICENSE.LGPL included in the packaging of this +** file. Please review the following information to ensure the GNU Lesser +** General Public License version 2.1 requirements will be met: +** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. +** +** In addition, as a special exception, Nokia gives you certain additional +** rights. These rights are described in the Nokia Qt LGPL Exception +** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU General +** Public License version 3.0 as published by the Free Software Foundation +** and appearing in the file LICENSE.GPL included in the packaging of this +** file. Please review the following information to ensure the GNU General +** Public License version 3.0 requirements will be met: +** http://www.gnu.org/copyleft/gpl.html. +** +** Other Usage +** Alternatively, this file may be used in accordance with the terms and +** conditions contained in a signed written agreement between you and Nokia. +** +** +** +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + + +#include "qsystemlock.h" +#include "qsystemlock_p.h" + +#include <qdebug.h> + +/*! \class QSystemLocker + + \brief The QSystemLocker class is a convenience class that simplifies + locking and unlocking system locks. + + The purpose of QSystemLocker is to simplify QSystemLock locking and + unlocking. Locking and unlocking a QSystemLock in complex functions and + statements or in exception handling code is error-prone and difficult to + debug. QSystemLocker can be used in such situations to ensure that the + state of the locks is always well-defined. + + QSystemLocker should be created within a function where a QSystemLock needs + to be locked. The system lock is locked when QSystemLocker is created. If + locked, the system lock will be unlocked when the QSystemLocker is + destroyed. QSystemLocker can be unlocked with unlock() and relocked with + relock(). + + \sa QSystemLock + */ + +/*! \fn QSystemLocker::QSystemLocker() + + Constructs a QSystemLocker and locks \a lock. The \a lock will be + unlocked when the QSystemLocker is destroyed. If lock is zero, + QSystemLocker does nothing. + + \sa QSystemLock::lock() + */ + +/*! \fn QSystemLocker::~QSystemLocker() + + Destroys the QSystemLocker and unlocks it if it was + locked in the constructor. + + \sa QSystemLock::unlock() + */ + +/*! \fn QSystemLocker::systemLock() + + Returns a pointer to the lock that was locked in the constructor. + */ + +/*! \fn QSystemLocker::relock() + + Relocks an unlocked locker. + + \sa unlock() + */ + +/*! \fn QSystemLocker::unlock() + + Unlocks this locker. You can use relock() to lock it again. + It does not need to be locked when destroyed. + + \sa relock() + */ + +/*! \class QSystemLock + + \brief The QSystemLock class provides a system wide lock + that can be used between threads or processes. + + The purpose of a QSystemLocker is to protect an object that can be + accessed by multiple threads or processes such as shared memory or a file. + + For example, say there is a method which prints a message to a log file: + + void log(const QString &logText) + { + QSystemLock systemLock(QLatin1String("logfile")); + systemLock.lock(); + QFile file(QDir::temp() + QLatin1String("/log")); + if (file.open(QIODevice::Append)) { + QTextStream out(&file); + out << logText; + } + systemLock.unlock(); + } + + If this is called from two separate processes the resulting log file is + guaranteed to contain both lines. + + When you call lock(), other threads or processes that try to call lock() + with the same key will block until the thread or process that got the lock + calls unlock(). + + A non-blocking alternative to lock() is tryLock(). + */ + +/*! + Constructs a new system lock with \a key. The lock is created in an + unlocked state. + + \sa lock(), key(). + */ +QSystemLock::QSystemLock(const QString &key) +{ + d = new QSystemLockPrivate; + setKey(key); +} + +/*! + Destroys a system lock. + + warning: This will not unlock the system lock if it has been locked. +*/ +QSystemLock::~QSystemLock() +{ + d->cleanHandle(); + delete d; +} + +/*! + Sets a new key to this system lock. + + \sa key() + */ +void QSystemLock::setKey(const QString &key) +{ + if (key == d->key) + return; + d->cleanHandle(); + d->lockCount = 0; + d->key = key; + // cache the file name so it doesn't have to be generated all the time. + d->fileName = d->makeKeyFileName(); + d->error = QSystemLock::NoError; + d->errorString = QString(); + d->handle(); +} + +/*! + Returns the key assigned to this system lock + + \sa setKey() + */ +QString QSystemLock::key() const +{ + return d->key; +} + +/*! + Locks the system lock. Lock \a mode can either be ReadOnly or ReadWrite. + If a mode is ReadOnly, attempts by other processes to obtain + ReadOnly locks will succeed, and ReadWrite attempts will block until + all of the ReadOnly locks are unlocked. If locked as ReadWrite, all + other attempts to lock will block until the lock is unlocked. A given + QSystemLock can be locked multiple times without blocking, and will + only be unlocked after a corresponding number of unlock() + calls are made. Returns true on success; otherwise returns false. + + \sa unlock(), tryLock() + */ +bool QSystemLock::lock(LockMode mode) +{ + if (d->lockCount > 0 && mode == ReadOnly && d->lockedMode == ReadWrite) { + qWarning() << "QSystemLock::lock readwrite lock on top of readonly lock."; + return false; + } + return d->modifySemaphore(QSystemLockPrivate::Lock, mode); +} + +/*! + Unlocks the system lock. + Returns true on success; otherwise returns false. + + \sa lock() + */ +bool QSystemLock::unlock() +{ + if (d->lockCount == 0) { + qWarning() << "QSystemLock::unlock: unlock with no lock."; + return false; + } + return d->modifySemaphore(QSystemLockPrivate::Unlock, d->lockedMode); +} + +/*! + Returns the type of error that occurred last or NoError. + + \sa errorString() + */ +QSystemLock::SystemLockError QSystemLock::error() const +{ + return d->error; +} + +/*! + Returns the human-readable message appropriate to the current error + reported by error(). If no suitable string is available, an empty + string is returned. + + \sa error() + */ +QString QSystemLock::errorString() const +{ + return d->errorString; +} + diff --git a/tests/auto/corelib/kernel/qtipc/qsharedmemory/src/qsystemlock.h b/tests/auto/corelib/kernel/qtipc/qsharedmemory/src/qsystemlock.h new file mode 100644 index 0000000000..f9db4f879c --- /dev/null +++ b/tests/auto/corelib/kernel/qtipc/qsharedmemory/src/qsystemlock.h @@ -0,0 +1,135 @@ +/**************************************************************************** +** +** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies). +** All rights reserved. +** Contact: Nokia Corporation (qt-info@nokia.com) +** +** This file is part of the test suite of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** GNU Lesser General Public License Usage +** This file may be used under the terms of the GNU Lesser General Public +** License version 2.1 as published by the Free Software Foundation and +** appearing in the file LICENSE.LGPL included in the packaging of this +** file. Please review the following information to ensure the GNU Lesser +** General Public License version 2.1 requirements will be met: +** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. +** +** In addition, as a special exception, Nokia gives you certain additional +** rights. These rights are described in the Nokia Qt LGPL Exception +** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU General +** Public License version 3.0 as published by the Free Software Foundation +** and appearing in the file LICENSE.GPL included in the packaging of this +** file. Please review the following information to ensure the GNU General +** Public License version 3.0 requirements will be met: +** http://www.gnu.org/copyleft/gpl.html. +** +** Other Usage +** Alternatively, this file may be used in accordance with the terms and +** conditions contained in a signed written agreement between you and Nokia. +** +** +** +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + + +#ifndef QSYSTEMLOCK_H +#define QSYSTEMLOCK_H + +#include <QtCore/qstring.h> + +QT_BEGIN_HEADER + +#ifndef QT_NO_SYSTEMLOCK + +QT_FORWARD_DECLARE_CLASS(QSystemLockPrivate) + +class QSystemLock +{ + +public: + enum SystemLockError + { + NoError, + UnknownError + }; + + QSystemLock(const QString &key); + ~QSystemLock(); + + void setKey(const QString &key); + QString key() const; + + enum LockMode + { + ReadOnly, + ReadWrite + }; + + bool lock(LockMode mode = ReadWrite); + bool unlock(); + + SystemLockError error() const; + QString errorString() const; + +private: + Q_DISABLE_COPY(QSystemLock) + + QSystemLockPrivate *d; +}; + +class QSystemLocker +{ + +public: + inline QSystemLocker(QSystemLock *systemLock, + QSystemLock::LockMode mode = QSystemLock::ReadWrite) : q_lock(systemLock) + { + autoUnLocked = relock(mode); + } + + inline ~QSystemLocker() + { + if (autoUnLocked) + unlock(); + } + + inline QSystemLock *systemLock() const + { + return q_lock; + } + + inline bool relock(QSystemLock::LockMode mode = QSystemLock::ReadWrite) + { + return (q_lock && q_lock->lock(mode)); + } + + inline bool unlock() + { + if (q_lock && q_lock->unlock()) { + autoUnLocked = false; + return true; + } + return false; + } + +private: + Q_DISABLE_COPY(QSystemLocker) + + bool autoUnLocked; + QSystemLock *q_lock; +}; + +#endif // QT_NO_SYSTEMLOCK + +QT_END_HEADER + +#endif // QSYSTEMLOCK_H + diff --git a/tests/auto/corelib/kernel/qtipc/qsharedmemory/src/qsystemlock_p.h b/tests/auto/corelib/kernel/qtipc/qsharedmemory/src/qsystemlock_p.h new file mode 100644 index 0000000000..628b005afc --- /dev/null +++ b/tests/auto/corelib/kernel/qtipc/qsharedmemory/src/qsystemlock_p.h @@ -0,0 +1,109 @@ +/**************************************************************************** +** +** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies). +** All rights reserved. +** Contact: Nokia Corporation (qt-info@nokia.com) +** +** This file is part of the test suite of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** GNU Lesser General Public License Usage +** This file may be used under the terms of the GNU Lesser General Public +** License version 2.1 as published by the Free Software Foundation and +** appearing in the file LICENSE.LGPL included in the packaging of this +** file. Please review the following information to ensure the GNU Lesser +** General Public License version 2.1 requirements will be met: +** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. +** +** In addition, as a special exception, Nokia gives you certain additional +** rights. These rights are described in the Nokia Qt LGPL Exception +** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU General +** Public License version 3.0 as published by the Free Software Foundation +** and appearing in the file LICENSE.GPL included in the packaging of this +** file. Please review the following information to ensure the GNU General +** Public License version 3.0 requirements will be met: +** http://www.gnu.org/copyleft/gpl.html. +** +** Other Usage +** Alternatively, this file may be used in accordance with the terms and +** conditions contained in a signed written agreement between you and Nokia. +** +** +** +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + + +#ifndef QSYSTEMLOCK_P_H +#define QSYSTEMLOCK_P_H + +#ifndef QT_NO_SYSTEMLOCK + +#include "qsystemlock.h" +#include "private/qsharedmemory_p.h" +#ifndef Q_OS_WINCE +#include <sys/types.h> +#endif + +#define MAX_LOCKS 64 + +class QSystemLockPrivate +{ + +public: + QSystemLockPrivate(); + + QString makeKeyFileName() + { + return QSharedMemoryPrivate::makePlatformSafeKey(key, QLatin1String("qipc_systemlock_")); + } + + void setErrorString(const QString &function); + +#ifdef Q_OS_WIN + HANDLE handle(); + bool lock(HANDLE, int count); + bool unlock(HANDLE, int count); +#else + key_t handle(); +#endif + void cleanHandle(); + + enum Operation { + Lock, + Unlock + }; + bool modifySemaphore(Operation op, QSystemLock::LockMode mode = QSystemLock::ReadOnly); + + QString key; + QString fileName; +#ifdef Q_OS_WIN + HANDLE semaphore; + HANDLE semaphoreLock; +#else + int semaphore; +#endif + int lockCount; + QSystemLock::LockMode lockedMode; + + QSystemLock::SystemLockError error; + QString errorString; + +private: +#ifndef Q_OS_WIN + key_t unix_key; + bool createdFile; + bool createdSemaphore; +#endif +}; + +#endif // QT_NO_SYSTEMLOCK + +#endif // QSYSTEMLOCK_P_H + diff --git a/tests/auto/corelib/kernel/qtipc/qsharedmemory/src/qsystemlock_unix.cpp b/tests/auto/corelib/kernel/qtipc/qsharedmemory/src/qsystemlock_unix.cpp new file mode 100644 index 0000000000..984379619e --- /dev/null +++ b/tests/auto/corelib/kernel/qtipc/qsharedmemory/src/qsystemlock_unix.cpp @@ -0,0 +1,234 @@ +/**************************************************************************** +** +** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies). +** All rights reserved. +** Contact: Nokia Corporation (qt-info@nokia.com) +** +** This file is part of the test suite of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** GNU Lesser General Public License Usage +** This file may be used under the terms of the GNU Lesser General Public +** License version 2.1 as published by the Free Software Foundation and +** appearing in the file LICENSE.LGPL included in the packaging of this +** file. Please review the following information to ensure the GNU Lesser +** General Public License version 2.1 requirements will be met: +** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. +** +** In addition, as a special exception, Nokia gives you certain additional +** rights. These rights are described in the Nokia Qt LGPL Exception +** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU General +** Public License version 3.0 as published by the Free Software Foundation +** and appearing in the file LICENSE.GPL included in the packaging of this +** file. Please review the following information to ensure the GNU General +** Public License version 3.0 requirements will be met: +** http://www.gnu.org/copyleft/gpl.html. +** +** Other Usage +** Alternatively, this file may be used in accordance with the terms and +** conditions contained in a signed written agreement between you and Nokia. +** +** +** +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + + +#include "qsystemlock.h" +#include "qsystemlock_p.h" + +#include <qdebug.h> +#include <qfile.h> + +#include <sys/types.h> +#include <sys/ipc.h> +#include <fcntl.h> +#include <errno.h> +#include <sys/shm.h> +#include <unistd.h> + +#include <sys/sem.h> +// We have to define this as on some sem.h will have it +union qt_semun { + int val; /* value for SETVAL */ + struct semid_ds *buf; /* buffer for IPC_STAT, IPC_SET */ + unsigned short *array; /* array for GETALL, SETALL */ +}; + +#define tr(x) QT_TRANSLATE_NOOP(QLatin1String("QSystemLock"), (x)) + +#if defined(Q_OS_SYMBIAN) +int createUnixKeyFile(const QString &fileName) +{ + if (QFile::exists(fileName)) + return 0; + + int fd = open(QFile::encodeName(fileName).constData(), + O_EXCL | O_CREAT | O_RDWR, 0640); + if (-1 == fd) { + if (errno == EEXIST) + return 0; + return -1; + } else { + close(fd); + } + return 1; +} +#endif + +QSystemLockPrivate::QSystemLockPrivate() : + semaphore(-1), lockCount(0), + error(QSystemLock::NoError), unix_key(-1), createdFile(false), createdSemaphore(false) +{ +} + +void QSystemLockPrivate::setErrorString(const QString &function) +{ + switch (errno) { + case EIDRM: + errorString = function + QLatin1String(": ") + tr("The semaphore set was removed"); + error = QSystemLock::UnknownError; + break; + default: + errorString = function + QLatin1String(": ") + tr("unknown error"); + error = QSystemLock::UnknownError; + qWarning() << errorString << "key" << key << "errno" << errno << ERANGE << ENOMEM << EINVAL << EINTR << EFBIG << EFAULT << EAGAIN << EACCES << E2BIG; + } +} + +/*! + \internal + + Setup unix_key + */ +key_t QSystemLockPrivate::handle() +{ + if (key.isEmpty()) + return -1; + + // ftok requires that an actual file exists somewhere + // If we have already made at some point in the past, + // double check that it is still there. + if (-1 != unix_key) { + int aNewunix_key = ftok(QFile::encodeName(fileName).constData(), 'Q'); + if (aNewunix_key != unix_key) { + cleanHandle(); + } else { + return unix_key; + } + } + + // Create the file needed for ftok +#if defined(Q_OS_SYMBIAN) + int built = createUnixKeyFile(fileName); +#else + int built = QSharedMemoryPrivate::createUnixKeyFile(fileName); +#endif + if (-1 == built) + return -1; + createdFile = (1 == built); + + // Get the unix key for the created file + unix_key = ftok(QFile::encodeName(fileName).constData(), 'Q'); + if (-1 == unix_key) { + setErrorString(QLatin1String("QSystemLock::handle ftok")); + return -1; + } + + // Get semaphore + semaphore = semget(unix_key, 1, 0666 | IPC_CREAT | IPC_EXCL); + if (-1 == semaphore) { + if (errno == EEXIST) + semaphore = semget(unix_key, 1, 0666 | IPC_CREAT); + if (-1 == semaphore) { + setErrorString(QLatin1String("QSystemLock::handle semget")); + cleanHandle(); + return -1; + } + } else { + // Created semaphore, initialize value. + createdSemaphore = true; + qt_semun init_op; + init_op.val = MAX_LOCKS; + if (-1 == semctl(semaphore, 0, SETVAL, init_op)) { + setErrorString(QLatin1String("QSystemLock::handle semctl")); + cleanHandle(); + return -1; + } + } + + return unix_key; +} + +/*! + \internal + + Cleanup the unix_key + */ +void QSystemLockPrivate::cleanHandle() +{ + unix_key = -1; + + // remove the file if we made it + if (createdFile) { + if (!QFile::remove(fileName)) + setErrorString(QLatin1String("QSystemLock::cleanHandle QFile::remove")); + createdFile = false; + } + + if (createdSemaphore) { + if (-1 != semaphore) { + if (-1 == semctl(semaphore, 0, IPC_RMID)) { + setErrorString(QLatin1String("QSystemLock::cleanHandle semctl")); + } + semaphore = -1; + } + createdSemaphore = false; + } +} + +/*! + \internal + + modifySemaphore generates operation.sem_op and handles recursive behavior. + */ +bool QSystemLockPrivate::modifySemaphore(QSystemLockPrivate::Operation op, + QSystemLock::LockMode mode) +{ + if (-1 == handle()) + return false; + + if ((lockCount == 0 && op == Lock) || (lockCount > 0 && op == Unlock)) { + if (op == Unlock) { + --lockCount; + if (lockCount < 0) + qFatal("%s: lockCount must not be negative", Q_FUNC_INFO); + if (lockCount > 0) + return true; + } + + struct sembuf operation; + operation.sem_num = 0; + operation.sem_op = (mode == QSystemLock::ReadWrite) ? MAX_LOCKS : 1; + if (op == Lock) + operation.sem_op *= -1; + operation.sem_flg = SEM_UNDO; + + if (-1 == semop(semaphore, &operation, 1)) { + setErrorString(QLatin1String("QSystemLock::modify")); + return false; + } + lockedMode = mode; + } + if (op == Lock) + lockCount++; + + return true; +} + diff --git a/tests/auto/corelib/kernel/qtipc/qsharedmemory/src/qsystemlock_win.cpp b/tests/auto/corelib/kernel/qtipc/qsharedmemory/src/qsystemlock_win.cpp new file mode 100644 index 0000000000..c04b596210 --- /dev/null +++ b/tests/auto/corelib/kernel/qtipc/qsharedmemory/src/qsystemlock_win.cpp @@ -0,0 +1,183 @@ +/**************************************************************************** +** +** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies). +** All rights reserved. +** Contact: Nokia Corporation (qt-info@nokia.com) +** +** This file is part of the test suite of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** GNU Lesser General Public License Usage +** This file may be used under the terms of the GNU Lesser General Public +** License version 2.1 as published by the Free Software Foundation and +** appearing in the file LICENSE.LGPL included in the packaging of this +** file. Please review the following information to ensure the GNU Lesser +** General Public License version 2.1 requirements will be met: +** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. +** +** In addition, as a special exception, Nokia gives you certain additional +** rights. These rights are described in the Nokia Qt LGPL Exception +** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU General +** Public License version 3.0 as published by the Free Software Foundation +** and appearing in the file LICENSE.GPL included in the packaging of this +** file. Please review the following information to ensure the GNU General +** Public License version 3.0 requirements will be met: +** http://www.gnu.org/copyleft/gpl.html. +** +** Other Usage +** Alternatively, this file may be used in accordance with the terms and +** conditions contained in a signed written agreement between you and Nokia. +** +** +** +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + + +#include "qsystemlock.h" +#include "qsystemlock_p.h" +#include <qdebug.h> +#include <QtCore> +QSystemLockPrivate::QSystemLockPrivate() : + semaphore(0), semaphoreLock(0), + lockCount(0), error(QSystemLock::NoError) +{ +} + +void QSystemLockPrivate::setErrorString(const QString &function) +{ + BOOL windowsError = GetLastError(); + if (windowsError == 0) + return; + errorString = function + QLatin1String(": ") + + QLatin1String("Unknown error"); + error = QSystemLock::UnknownError; + qWarning() << errorString << "key" << key << (int)windowsError << semaphore << semaphoreLock; +} + +/*! + \internal + + Setup the semaphore + */ +HANDLE QSystemLockPrivate::handle() +{ + // don't allow making handles on empty keys + if (key.isEmpty()) + return 0; + + // Create it if it doesn't already exists. + if (semaphore == 0) { + QString safeName = makeKeyFileName(); + semaphore = CreateSemaphore(0, MAX_LOCKS, MAX_LOCKS, (wchar_t*)safeName.utf16()); + + if (semaphore == 0) { + setErrorString(QLatin1String("QSystemLockPrivate::handle")); + return 0; + } + } + + if (semaphoreLock == 0) { + QString safeLockName = QSharedMemoryPrivate::makePlatformSafeKey(key + QLatin1String("lock"), QLatin1String("qipc_systemlock_")); + semaphoreLock = CreateSemaphore(0, 1, 1, (wchar_t*)safeLockName.utf16()); + + if (semaphoreLock == 0) { + setErrorString(QLatin1String("QSystemLockPrivate::handle")); + return 0; + } + } + + return semaphore; +} + +/*! + \internal + + Cleanup the semaphore + */ +void QSystemLockPrivate::cleanHandle() +{ + if (semaphore && !CloseHandle(semaphore)) + setErrorString(QLatin1String("QSystemLockPrivate::cleanHandle:")); + if (semaphoreLock && !CloseHandle(semaphoreLock)) + setErrorString(QLatin1String("QSystemLockPrivate::cleanHandle:")); + semaphore = 0; + semaphoreLock = 0; +} + +bool QSystemLockPrivate::lock(HANDLE handle, int count) +{ + if (count == 1) { + WaitForSingleObject(handle, INFINITE); + return true; + } + + int i = count; + while (i > 0) { + if (WAIT_OBJECT_0 == WaitForSingleObject(handle, 0)) { + --i; + } else { + // undo what we have done, sleep and then try again later + ReleaseSemaphore(handle, (count - i), 0); + i = count; + ReleaseSemaphore(semaphoreLock, 1, 0); + Sleep(1); + WaitForSingleObject(semaphoreLock, INFINITE); + } + } + return true; +} + +bool QSystemLockPrivate::unlock(HANDLE handle, int count) +{ + if (0 == ReleaseSemaphore(handle, count, 0)) { + setErrorString(QLatin1String("QSystemLockPrivate::unlock")); + return false; + } + return true; +} + +/*! + \internal + + modifySemaphore handles recursive behavior and modifies the semaphore. + */ +bool QSystemLockPrivate::modifySemaphore(QSystemLockPrivate::Operation op, + QSystemLock::LockMode mode) +{ + if (0 == handle()) + return false; + + if ((lockCount == 0 && op == Lock) || (lockCount > 0 && op == Unlock)) { + if (op == Unlock) { + --lockCount; + if (lockCount < 0) + qFatal("%s: lockCount must not be negative", Q_FUNC_INFO); + if (lockCount > 0) + return true; + } + + int count = (mode == QSystemLock::ReadWrite) ? MAX_LOCKS : 1; + if (op == Lock) { + lock(semaphoreLock, 1); + lock(semaphore, count); + if (count != MAX_LOCKS) unlock(semaphoreLock, 1); + lockedMode = mode; + } else { + if (count == MAX_LOCKS) unlock(semaphoreLock, 1); + unlock(semaphore, count); + } + + } + if (op == Lock) + lockCount++; + + return true; +} + diff --git a/tests/auto/corelib/kernel/qtipc/qsharedmemory/src/src.pri b/tests/auto/corelib/kernel/qtipc/qsharedmemory/src/src.pri new file mode 100644 index 0000000000..8aaf528447 --- /dev/null +++ b/tests/auto/corelib/kernel/qtipc/qsharedmemory/src/src.pri @@ -0,0 +1,11 @@ +INCLUDEPATH += $$PWD +DEPENDPATH += $$PWD +QT += core-private + +SOURCES += $$PWD/qsystemlock.cpp + +HEADERS += $$PWD/qsystemlock.h \ + $$PWD/qsystemlock_p.h + +unix:SOURCES += $$PWD/qsystemlock_unix.cpp +win32:SOURCES += $$PWD/qsystemlock_win.cpp |