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Branched from the monolithic repo, Qt master branch, at commit
896db169ea224deb96c59ce8af800d019de63f12

1 files changed, 772 insertions, 0 deletions

diff --git a/src/corelib/thread/qthread.cpp b/src/corelib/thread/qthread.cpp
new file mode 100644
index 0000000000..aaa1e6dc36
--- /dev/null
+++ b/src/corelib/thread/qthread.cpp
@@ -0,0 +1,772 @@
+/****************************************************************************
+**
+** 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 QtCore module 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 "qthread.h"
+#include "qthreadstorage.h"
+#include "qmutex.h"
+#include "qmutexpool_p.h"
+#include "qreadwritelock.h"
+#include "qabstracteventdispatcher.h"
+
+#include <qeventloop.h>
+#include <qhash.h>
+
+#include "qthread_p.h"
+#include "private/qcoreapplication_p.h"
+
+/*
+#ifdef Q_OS_WIN32
+# include "qt_windows.h"
+#else
+# include <unistd.h>
+# include <netinet/in.h>
+# include <sys/utsname.h>
+# include <sys/socket.h>
+*/
+/*
+#  elif defined(Q_OS_HPUX)
+#   include <sys/pstat.h>
+#  elif defined(Q_OS_FREEBSD) || defined(Q_OS_OPENBSD) || defined(Q_OS_MAC)
+#   include <sys/sysctl.h>
+#  endif
+#endif
+*/
+
+QT_BEGIN_NAMESPACE
+
+/*
+  QThreadData
+*/
+
+QThreadData::QThreadData(int initialRefCount)
+    : _ref(initialRefCount), thread(0), threadId(0),
+      quitNow(false), loopLevel(0), eventDispatcher(0), canWait(true), isAdopted(false)
+{
+    // fprintf(stderr, "QThreadData %p created\n", this);
+}
+
+QThreadData::~QThreadData()
+{
+    Q_ASSERT(_ref == 0);
+
+    // In the odd case that Qt is running on a secondary thread, the main
+    // thread instance will have been dereffed asunder because of the deref in
+    // QThreadData::current() and the deref in the pthread_destroy. To avoid
+    // crashing during QCoreApplicationData's global static cleanup we need to
+    // safeguard the main thread here.. This fix is a bit crude, but it solves
+    // the problem...
+    if (this->thread == QCoreApplicationPrivate::theMainThread) {
+       QCoreApplicationPrivate::theMainThread = 0;
+    }
+
+    QThread *t = thread;
+    thread = 0;
+    delete t;
+
+    for (int i = 0; i < postEventList.size(); ++i) {
+        const QPostEvent &pe = postEventList.at(i);
+        if (pe.event) {
+            --pe.receiver->d_func()->postedEvents;
+            pe.event->posted = false;
+            delete pe.event;
+        }
+    }
+
+    // fprintf(stderr, "QThreadData %p destroyed\n", this);
+}
+
+void QThreadData::ref()
+{
+#ifndef QT_NO_THREAD
+    (void) _ref.ref();
+    Q_ASSERT(_ref != 0);
+#endif
+}
+
+void QThreadData::deref()
+{
+#ifndef QT_NO_THREAD
+    if (!_ref.deref())
+        delete this;
+#endif
+}
+
+/*
+  QAdoptedThread
+*/
+
+QAdoptedThread::QAdoptedThread(QThreadData *data)
+    : QThread(*new QThreadPrivate(data))
+{
+    // thread should be running and not finished for the lifetime
+    // of the application (even if QCoreApplication goes away)
+#ifndef QT_NO_THREAD
+    d_func()->running = true;
+    d_func()->finished = false;
+    init();
+#endif
+
+    // fprintf(stderr, "new QAdoptedThread = %p\n", this);
+}
+
+QAdoptedThread::~QAdoptedThread()
+{
+    // fprintf(stderr, "~QAdoptedThread = %p\n", this);
+}
+
+QThread *QAdoptedThread::createThreadForAdoption()
+{
+    QScopedPointer<QThread> t(new QAdoptedThread(0));
+    t->moveToThread(t.data());
+    return t.take();
+}
+
+void QAdoptedThread::run()
+{
+    // this function should never be called
+    qFatal("QAdoptedThread::run(): Internal error, this implementation should never be called.");
+}
+#ifndef QT_NO_THREAD
+/*
+  QThreadPrivate
+*/
+
+QThreadPrivate::QThreadPrivate(QThreadData *d)
+    : QObjectPrivate(), running(false), finished(false), terminated(false),
+      isInFinish(false), exited(false), returnCode(-1),
+      stackSize(0), priority(QThread::InheritPriority), data(d)
+{
+#if defined (Q_OS_UNIX)
+    thread_id = 0;
+#elif defined (Q_WS_WIN)
+    handle = 0;
+    id = 0;
+    waiters = 0;
+#endif
+#if defined (Q_WS_WIN) || defined (Q_OS_SYMBIAN)
+    terminationEnabled = true;
+    terminatePending = false;
+#endif
+
+    if (!data)
+        data = new QThreadData;
+}
+
+QThreadPrivate::~QThreadPrivate()
+{
+    data->deref();
+}
+
+/*!
+    \class QThread
+    \brief The QThread class provides platform-independent threads.
+
+    \ingroup thread
+
+    A QThread represents a separate thread of control within the
+    program; it shares data with all the other threads within the
+    process but executes independently in the way that a separate
+    program does on a multitasking operating system. Instead of
+    starting in \c main(), QThreads begin executing in run().  By
+    default, run() starts the event loop by calling exec() (see
+    below). To create your own threads, subclass QThread and
+    reimplement run(). For example:
+
+    \snippet doc/src/snippets/code/src_corelib_thread_qthread.cpp 0
+
+    This will create a QTcpSocket in the thread and then execute the
+    thread's event loop. Use the start() method to begin execution.
+    Execution ends when you return from run(), just as an application
+    does when it leaves main(). QThread will notifiy you via a signal
+    when the thread is started(), finished(), and terminated(), or
+    you can use isFinished() and isRunning() to query the state of
+    the thread. Use wait() to block until the thread has finished
+    execution.
+
+    Each thread gets its own stack from the operating system. The
+    operating system also determines the default size of the stack.
+    You can use setStackSize() to set a custom stack size.
+
+    Each QThread can have its own event loop. You can start the event
+    loop by calling exec(); you can stop it by calling exit() or
+    quit(). Having an event loop in a thread makes it possible to
+    connect signals from other threads to slots in this thread, using
+    a mechanism called \l{Qt::QueuedConnection}{queued
+    connections}. It also makes it possible to use classes that
+    require the event loop, such as QTimer and QTcpSocket, in the
+    thread. Note, however, that it is not possible to use any widget
+    classes in the thread.
+
+    In extreme cases, you may want to forcibly terminate() an
+    executing thread. However, doing so is dangerous and discouraged.
+    Please read the documentation for terminate() and
+    setTerminationEnabled() for detailed information.
+
+    The static functions currentThreadId() and currentThread() return
+    identifiers for the currently executing thread. The former
+    returns a platform specific ID for the thread; the latter returns
+    a QThread pointer.
+
+    QThread also provides platform independent sleep functions in
+    varying resolutions. Use sleep() for full second resolution,
+    msleep() for millisecond resolution, and usleep() for microsecond
+    resolution.
+
+    \sa {Thread Support in Qt}, QThreadStorage, QMutex, QSemaphore, QWaitCondition,
+        {Mandelbrot Example}, {Semaphores Example}, {Wait Conditions Example}
+*/
+
+/*!
+    \fn Qt::HANDLE QThread::currentThreadId()
+
+    Returns the thread handle of the currently executing thread.
+
+    \warning The handle returned by this function is used for internal
+    purposes and should not be used in any application code.
+
+    \warning On Windows, the returned value is a pseudo-handle for the
+    current thread. It can't be used for numerical comparison. i.e.,
+    this function returns the DWORD (Windows-Thread ID) returned by
+    the Win32 function getCurrentThreadId(), not the HANDLE
+    (Windows-Thread HANDLE) returned by the Win32 function
+    getCurrentThread().
+*/
+
+/*!
+    \fn int QThread::idealThreadCount()
+
+    Returns the ideal number of threads that can be run on the system. This is done querying
+    the number of processor cores, both real and logical, in the system. This function returns -1
+    if the number of processor cores could not be detected.
+*/
+
+/*!
+    \fn void QThread::yieldCurrentThread()
+
+    Yields execution of the current thread to another runnable thread,
+    if any. Note that the operating system decides to which thread to
+    switch.
+*/
+
+/*!
+    \fn void QThread::start(Priority priority)
+
+    Begins execution of the thread by calling run(), which should be
+    reimplemented in a QThread subclass to contain your code. The
+    operating system will schedule the thread according to the \a
+    priority parameter. If the thread is already running, this
+    function does nothing.
+
+    The effect of the \a priority parameter is dependent on the
+    operating system's scheduling policy. In particular, the \a priority
+    will be ignored on systems that do not support thread priorities
+    (such as on Linux, see http://linux.die.net/man/2/sched_setscheduler
+    for more details).
+
+    \sa run(), terminate()
+*/
+
+/*!
+    \fn void QThread::started()
+
+    This signal is emitted when the thread starts executing.
+
+    \sa finished(), terminated()
+*/
+
+/*!
+    \fn void QThread::finished()
+
+    This signal is emitted when the thread has finished executing.
+
+    \sa started(), terminated()
+*/
+
+/*!
+    \fn void QThread::terminated()
+
+    This signal is emitted when the thread is terminated.
+
+    \sa started(), finished()
+*/
+
+/*!
+    \enum QThread::Priority
+
+    This enum type indicates how the operating system should schedule
+    newly created threads.
+
+    \value IdlePriority scheduled only when no other threads are
+           running.
+
+    \value LowestPriority scheduled less often than LowPriority.
+    \value LowPriority scheduled less often than NormalPriority.
+
+    \value NormalPriority the default priority of the operating
+           system.
+
+    \value HighPriority scheduled more often than NormalPriority.
+    \value HighestPriority scheduled more often than HighPriority.
+
+    \value TimeCriticalPriority scheduled as often as possible.
+
+    \value InheritPriority use the same priority as the creating
+           thread. This is the default.
+*/
+
+/*!
+    Returns a pointer to a QThread which represents the currently
+    executing thread.
+*/
+QThread *QThread::currentThread()
+{
+    QThreadData *data = QThreadData::current();
+    Q_ASSERT(data != 0);
+    return data->thread;
+}
+
+/*!
+    Constructs a new thread with the given \a parent. The thread does
+    not begin executing until start() is called.
+
+    \sa start()
+*/
+QThread::QThread(QObject *parent)
+    : QObject(*(new QThreadPrivate), parent)
+{
+    Q_D(QThread);
+    // fprintf(stderr, "QThreadData %p created for thread %p\n", d->data, this);
+    d->data->thread = this;
+}
+
+/*! \internal
+ */
+QThread::QThread(QThreadPrivate &dd, QObject *parent)
+    : QObject(dd, parent)
+{
+    Q_D(QThread);
+    // fprintf(stderr, "QThreadData %p taken from private data for thread %p\n", d->data, this);
+    d->data->thread = this;
+}
+
+/*!
+    Destroys the thread.
+
+    Note that deleting a QThread object will not stop the execution
+    of the thread it represents. Deleting a running QThread (i.e.
+    isFinished() returns false) will probably result in a program
+    crash. You can wait() on a thread to make sure that it has
+    finished.
+*/
+QThread::~QThread()
+{
+    Q_D(QThread);
+    {
+        QMutexLocker locker(&d->mutex);
+        if (d->isInFinish) {
+            locker.unlock();
+            wait();
+            locker.relock();
+        }
+        if (d->running && !d->finished && !d->data->isAdopted)
+            qWarning("QThread: Destroyed while thread is still running");
+
+        d->data->thread = 0;
+    }
+}
+
+/*!
+    Returns true if the thread is finished; otherwise returns false.
+
+    \sa isRunning()
+*/
+bool QThread::isFinished() const
+{
+    Q_D(const QThread);
+    QMutexLocker locker(&d->mutex);
+    return d->finished;
+}
+
+/*!
+    Returns true if the thread is running; otherwise returns false.
+
+    \sa isFinished()
+*/
+bool QThread::isRunning() const
+{
+    Q_D(const QThread);
+    QMutexLocker locker(&d->mutex);
+    return d->running;
+}
+
+/*!
+    Sets the maximum stack size for the thread to \a stackSize. If \a
+    stackSize is greater than zero, the maximum stack size is set to
+    \a stackSize bytes, otherwise the maximum stack size is
+    automatically determined by the operating system.
+
+    \warning Most operating systems place minimum and maximum limits
+    on thread stack sizes. The thread will fail to start if the stack
+    size is outside these limits.
+
+    \sa stackSize()
+*/
+void QThread::setStackSize(uint stackSize)
+{
+    Q_D(QThread);
+    QMutexLocker locker(&d->mutex);
+    Q_ASSERT_X(!d->running, "QThread::setStackSize",
+               "cannot change stack size while the thread is running");
+    d->stackSize = stackSize;
+}
+
+/*!
+    Returns the maximum stack size for the thread (if set with
+    setStackSize()); otherwise returns zero.
+
+    \sa setStackSize()
+*/
+uint QThread::stackSize() const
+{
+    Q_D(const QThread);
+    QMutexLocker locker(&d->mutex);
+    return d->stackSize;
+}
+
+/*!
+    Enters the event loop and waits until exit() is called, returning the value
+    that was passed to exit(). The value returned is 0 if exit() is called via
+    quit().
+
+    It is necessary to call this function to start event handling.
+
+    \sa quit(), exit()
+*/
+int QThread::exec()
+{
+    Q_D(QThread);
+    QMutexLocker locker(&d->mutex);
+    d->data->quitNow = false;
+    if (d->exited) {
+        d->exited = false;
+        return d->returnCode;
+    }
+    locker.unlock();
+
+    QEventLoop eventLoop;
+    int returnCode = eventLoop.exec();
+
+    locker.relock();
+    d->exited = false;
+    d->returnCode = -1;
+    return returnCode;
+}
+
+/*!
+    Tells the thread's event loop to exit with a return code.
+
+    After calling this function, the thread leaves the event loop and
+    returns from the call to QEventLoop::exec(). The
+    QEventLoop::exec() function returns \a returnCode.
+
+    By convention, a \a returnCode of 0 means success, any non-zero value
+    indicates an error.
+
+    Note that unlike the C library function of the same name, this
+    function \e does return to the caller -- it is event processing
+    that stops. 
+    
+    No QEventLoops will be started anymore in this thread  until 
+    QThread::exec() has been called again. If the eventloop in QThread::exec()
+    is not running then the next call to QThread::exec() will also return
+    immediately.
+
+    \sa quit() QEventLoop
+*/
+void QThread::exit(int returnCode)
+{
+    Q_D(QThread);
+    QMutexLocker locker(&d->mutex);
+    d->exited = true;
+    d->returnCode = returnCode;
+    d->data->quitNow = true;
+    for (int i = 0; i < d->data->eventLoops.size(); ++i) {
+        QEventLoop *eventLoop = d->data->eventLoops.at(i);
+        eventLoop->exit(returnCode);
+    }
+}
+
+/*!
+    Tells the thread's event loop to exit with return code 0 (success).
+    Equivalent to calling QThread::exit(0).
+
+    This function does nothing if the thread does not have an event
+    loop.
+
+    \sa exit() QEventLoop
+*/
+void QThread::quit()
+{ exit(); }
+
+/*!
+    The starting point for the thread. After calling start(), the
+    newly created thread calls this function. The default
+    implementation simply calls exec().
+
+    You can reimplemented this function to do other useful
+    work. Returning from this method will end the execution of the
+    thread.
+
+    \sa start() wait()
+*/
+void QThread::run()
+{
+    (void) exec();
+}
+
+/*! \internal
+    Initializes the QThread system.
+*/
+#if defined (Q_OS_WIN)
+void qt_create_tls();
+#endif
+
+void QThread::initialize()
+{
+    if (qt_global_mutexpool)
+        return;
+    qt_global_mutexpool = QMutexPool::instance();
+
+#if defined (Q_OS_WIN)
+    qt_create_tls();
+#endif
+}
+
+
+/*! \internal
+    Cleans up the QThread system.
+*/
+void QThread::cleanup()
+{
+    qt_global_mutexpool = 0;
+}
+
+/*!
+    \fn bool QThread::finished() const
+
+    Use isFinished() instead.
+*/
+
+/*!
+    \fn bool QThread::running() const
+
+    Use isRunning() instead.
+*/
+
+/*! \fn void QThread::setPriority(Priority priority)
+    \since 4.1
+
+    This function sets the \a priority for a running thread. If the
+    thread is not running, this function does nothing and returns
+    immediately.  Use start() to start a thread with a specific
+    priority.
+
+    The \a priority argument can be any value in the \c
+    QThread::Priority enum except for \c InheritPriorty.
+
+    The effect of the \a priority parameter is dependent on the
+    operating system's scheduling policy. In particular, the \a priority
+    will be ignored on systems that do not support thread priorities
+    (such as on Linux, see http://linux.die.net/man/2/sched_setscheduler
+    for more details).
+
+    \sa Priority priority() start()
+*/
+
+/*!
+    \since 4.1
+
+    Returns the priority for a running thread.  If the thread is not
+    running, this function returns \c InheritPriority.
+
+    \sa Priority setPriority() start()
+*/
+QThread::Priority QThread::priority() const
+{
+    Q_D(const QThread);
+    QMutexLocker locker(&d->mutex);
+
+    // mask off the high bits that are used for flags
+    return Priority(d->priority & 0xffff);
+}
+
+/*!
+    \fn void QThread::sleep(unsigned long secs)
+
+    Forces the current thread to sleep for \a secs seconds.
+
+    \sa msleep(), usleep()
+*/
+
+/*!
+    \fn void QThread::msleep(unsigned long msecs)
+
+    Causes the current thread to sleep for \a msecs milliseconds.
+
+    \sa sleep(), usleep()
+*/
+
+/*!
+    \fn void QThread::usleep(unsigned long usecs)
+
+    Causes the current thread to sleep for \a usecs microseconds.
+
+    \sa sleep(), msleep()
+*/
+
+/*!
+    \fn void QThread::terminate()
+
+    Terminates the execution of the thread. The thread may or may not
+    be terminated immediately, depending on the operating systems
+    scheduling policies. Use QThread::wait() after terminate() for
+    synchronous termination.
+
+    When the thread is terminated, all threads waiting for the thread
+    to finish will be woken up.
+
+    \warning This function is dangerous and its use is discouraged.
+    The thread can be terminated at any point in its code path.
+    Threads can be terminated while modifying data. There is no
+    chance for the thread to clean up after itself, unlock any held
+    mutexes, etc. In short, use this function only if absolutely
+    necessary.
+
+    Termination can be explicitly enabled or disabled by calling
+    QThread::setTerminationEnabled(). Calling this function while
+    termination is disabled results in the termination being
+    deferred, until termination is re-enabled. See the documentation
+    of QThread::setTerminationEnabled() for more information.
+
+    \sa setTerminationEnabled()
+*/
+
+/*!
+    \fn bool QThread::wait(unsigned long time)
+
+    Blocks the thread until either of these conditions is met:
+
+    \list
+    \o The thread associated with this QThread object has finished
+       execution (i.e. when it returns from \l{run()}). This function
+       will return true if the thread has finished. It also returns
+       true if the thread has not been started yet.
+    \o \a time milliseconds has elapsed. If \a time is ULONG_MAX (the
+        default), then the wait will never timeout (the thread must
+        return from \l{run()}). This function will return false if the
+        wait timed out.
+    \endlist
+
+    This provides similar functionality to the POSIX \c
+    pthread_join() function.
+
+    \sa sleep(), terminate()
+*/
+
+/*!
+    \fn void QThread::setTerminationEnabled(bool enabled)
+
+    Enables or disables termination of the current thread based on the
+    \a enabled parameter. The thread must have been started by
+    QThread.
+
+    When \a enabled is false, termination is disabled.  Future calls
+    to QThread::terminate() will return immediately without effect.
+    Instead, the termination is deferred until termination is enabled.
+
+    When \a enabled is true, termination is enabled.  Future calls to
+    QThread::terminate() will terminate the thread normally.  If
+    termination has been deferred (i.e. QThread::terminate() was
+    called with termination disabled), this function will terminate
+    the calling thread \e immediately.  Note that this function will
+    not return in this case.
+
+    \sa terminate()
+*/
+
+#else // QT_NO_THREAD
+
+QThread::QThread(QObject *parent)
+    : QObject(*(new QThreadPrivate), (QObject*)0){
+    Q_D(QThread);
+    d->data->thread = this;
+}
+
+QThread *QThread::currentThread()
+{
+    return QThreadData::current()->thread;
+}
+
+QThreadData* QThreadData::current()
+{
+    static QThreadData *data = 0; // reinterpret_cast<QThreadData *>(pthread_getspecific(current_thread_data_key));
+    if (!data) {
+        QScopedPointer<QThreadData> newdata(new QThreadData);
+        newdata->thread = new QAdoptedThread(newdata.data());
+        data = newdata.take();
+        data->deref();
+    }
+    return data;
+}
+
+/*! \internal
+ */
+QThread::QThread(QThreadPrivate &dd, QObject *parent)
+    : QObject(dd, parent)
+{
+    Q_D(QThread);
+    // fprintf(stderr, "QThreadData %p taken from private data for thread %p\n", d->data, this);
+    d->data->thread = this;
+}
+
+#endif // QT_NO_THREAD
+
+QT_END_NAMESPACE