/****************************************************************************
**
** Copyright (C) 1992-2006 Trolltech ASA. All rights reserved.
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** Licensees holding valid Qt Preview licenses may use this file in
** accordance with the Qt Preview License Agreement provided with the
** Software.
**
** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for
** information about Qt Commercial License Agreements.
**
** Contact info@trolltech.com if any conditions of this licensing are
** not clear to you.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
****************************************************************************/

#ifndef QTHREADSTORAGE_H
#define QTHREADSTORAGE_H

#include <QtCore/qglobal.h>

#ifndef QT_NO_THREAD

QT_BEGIN_HEADER

QT_MODULE(Core)

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); }

#ifndef QT_NO_PARTIAL_TEMPLATE_SPECIALIZATION

// 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)); }

#endif // QT_NO_PARTIAL_TEMPLATE_SPECIALIZATION

// MOC_SKIP_END
#endif

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

    Q_DISABLE_COPY(QThreadStorage)

    static inline void deleteData(void *x)
    { delete reinterpret_cast<T&>(x); }

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_HEADER

#endif // QT_NO_THREAD

#endif // QTHREADSTORAGE_H
