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+/****************************************************************************
+**
+** Copyright (C) 2010 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.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, 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.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+
+#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 seperate 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;
+}
+