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qthread_p.h

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**
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**
** This file is part of the QtCore module of the Qt Toolkit.
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** License versions 2.0 or 3.0 as published by the Free Software
** Foundation and appearing in the files LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file.  Alternatively you may (at
** your option) use any later version of the GNU General Public
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** (or its successors, if any) and the KDE Free Qt Foundation. In
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** additional rights. These rights are described in the Trolltech GPL
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#ifndef QTHREAD_P_H
#define QTHREAD_P_H

//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists for the convenience
// of QAbstractItemModel*.  This header file may change from version
// to version without notice, or even be removed.
//
// We mean it.
//
//

#include "qplatformdefs.h"
#include "QtCore/qthread.h"
#include "QtCore/qmutex.h"
#include "QtCore/qstack.h"
#include "QtCore/qwaitcondition.h"
#include "QtCore/qhash.h"
#include "private/qobject_p.h"

class QAbstractEventDispatcher;
class QEventLoop;

class QPostEvent
{
public:
    QObject *receiver;
    QEvent *event;
    int priority;
    inline QPostEvent()
        : receiver(0), event(0), priority(0)
    { }
    inline QPostEvent(QObject *r, QEvent *e, int p)
        : receiver(r), event(e), priority(p)
    { }
};
inline bool operator<(int priority, const QPostEvent &pe)
{
    return pe.priority < priority;
}
inline bool operator<(const QPostEvent &pe, int priority)
{
    return priority < pe.priority;
}

class QPostEventList : public QList<QPostEvent>
{
public:
    // recursion == recursion count for sendPostedEvents()
    int recursion;

    // sendOffset == the current event to start sending
    int startOffset;
    // insertionOffset == set by sendPostedEvents to tell postEvent() where to start insertions
    int insertionOffset;

    int numPostedEvents;
    QMutex mutex;

    inline QPostEventList()
        : QList<QPostEvent>(), recursion(0), startOffset(0), insertionOffset(0), numPostedEvents(0)
    { }
};

class Q_CORE_EXPORT QThreadData
{
    QAtomic _ref;

public:
    QThreadData(int initialRefCount = 1);
    ~QThreadData();

    static QThreadData *current();
    static QThreadData *get2(QThread *thread);

    void ref();
    void deref();

    QThread *thread;
    bool quitNow;
    QAbstractEventDispatcher *eventDispatcher;
    QStack<QEventLoop *> eventLoops;
    QPostEventList postEventList;
    bool canWait;
    QHash<int, void *> tls;
};

#ifndef QT_NO_THREAD
class QThreadPrivate : public QObjectPrivate
{
    Q_DECLARE_PUBLIC(QThread)

public:
    QThreadPrivate(QThreadData *d = 0);
    ~QThreadPrivate();

    mutable QMutex mutex;

    bool running;
    bool finished;
    bool terminated;

    uint stackSize;
    QThread::Priority priority;

    static QThread *threadForId(int id);

#ifdef Q_OS_UNIX
    pthread_t thread_id;
    QWaitCondition thread_done;

    static void *start(void *arg);
    static void finish(void *arg);
#endif

#ifdef Q_OS_WIN32
    HANDLE handle;
    unsigned int id;
    int waiters;
    bool terminationEnabled, terminatePending;

    static unsigned int __stdcall start(void *);
    static void finish(void *, bool lockAnyway=true);
#endif // Q_OS_WIN32

    QThreadData *data;

    static void createEventDispatcher(QThreadData *data);
};

// thread wrapper for the main() thread
class QAdoptedThread : public QThread
{
    Q_DECLARE_PRIVATE(QThread)

public:
    QAdoptedThread(QThreadData *data = 0);
    ~QAdoptedThread();
    void init();

    static QThread *createThreadForAdoption();
private:
    inline void run()
    {
        // this function should never be called, it is implemented
        // only so that we can instantiate the object
        qFatal("QAdoptedThread::run(): Internal error, this implementation should never be called.");
    }
};

#else // QT_NO_THREAD

class QThreadPrivate : public QObjectPrivate
{
public:
    QThreadPrivate() : data(new QThreadData) {}
    ~QThreadPrivate() { delete data; }

    QThreadData *data;

    static void setCurrentThread(QThread*) {}
    static QThread *threadForId(int) { return QThread::currentThread(); }
    static void createEventDispatcher(QThreadData *data);

    Q_DECLARE_PUBLIC(QThread)
};

#endif // QT_NO_THREAD

#endif // QTHREAD_P_H

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