/****************************************************************************
**
** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL21$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/contact-us.
**
** 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 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** $QT_END_LICENSE$
**
****************************************************************************/

#ifndef QTHREADSTORAGE_H
#define QTHREADSTORAGE_H

#include <QtCore/qglobal.h>

#ifndef QT_NO_THREAD

QT_BEGIN_NAMESPACE


class Q_CORE_EXPORT QThreadStorageData
{
public:
    explicit QThreadStorageData(void (*func)(void *));
    ~QThreadStorageData();

    void** get() const;
    void** set(void* p);

    static void finish(void**);
    int id;
};

#if !defined(QT_MOC_CPP)
// MOC_SKIP_BEGIN

// pointer specialization
template <typename T>
inline
T *&qThreadStorage_localData(QThreadStorageData &d, T **)
{
    void **v = d.get();
    if (!v) v = d.set(0);
    return *(reinterpret_cast<T**>(v));
}

template <typename T>
inline
T *qThreadStorage_localData_const(const QThreadStorageData &d, T **)
{
    void **v = d.get();
    return v ? *(reinterpret_cast<T**>(v)) : 0;
}

template <typename T>
inline
void qThreadStorage_setLocalData(QThreadStorageData &d, T **t)
{ (void) d.set(*t); }

template <typename T>
inline
void qThreadStorage_deleteData(void *d, T **)
{ delete static_cast<T *>(d); }

// value-based specialization
template <typename T>
inline
T &qThreadStorage_localData(QThreadStorageData &d, T *)
{
    void **v = d.get();
    if (!v) v = d.set(new T());
    return *(reinterpret_cast<T*>(*v));
}

template <typename T>
inline
T qThreadStorage_localData_const(const QThreadStorageData &d, T *)
{
    void **v = d.get();
    return v ? *(reinterpret_cast<T*>(*v)) : T();
}

template <typename T>
inline
void qThreadStorage_setLocalData(QThreadStorageData &d, T *t)
{ (void) d.set(new T(*t)); }

template <typename T>
inline
void qThreadStorage_deleteData(void *d, T *)
{ delete static_cast<T *>(d); }


// MOC_SKIP_END
#endif

template <class T>
class QThreadStorage
{
private:
    QThreadStorageData d;

    Q_DISABLE_COPY(QThreadStorage)

    static inline void deleteData(void *x)
    { qThreadStorage_deleteData(x, reinterpret_cast<T*>(0)); }

public:
    inline QThreadStorage() : d(deleteData) { }
    inline ~QThreadStorage() { }

    inline bool hasLocalData() const
    { return d.get() != 0; }

    inline T& localData()
    { return qThreadStorage_localData(d, reinterpret_cast<T*>(0)); }
    inline T localData() const
    { return qThreadStorage_localData_const(d, reinterpret_cast<T*>(0)); }

    inline void setLocalData(T t)
    { qThreadStorage_setLocalData(d, &t); }
};

QT_END_NAMESPACE

#endif // QT_NO_THREAD

#endif // QTHREADSTORAGE_H
