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Diffstat (limited to 'src/qml/qml/ftw/qrecyclepool_p.h')
| -rw-r--r-- | src/qml/qml/ftw/qrecyclepool_p.h | 220 |
1 files changed, 220 insertions, 0 deletions
diff --git a/src/qml/qml/ftw/qrecyclepool_p.h b/src/qml/qml/ftw/qrecyclepool_p.h new file mode 100644 index 0000000000..8d0f060ab3 --- /dev/null +++ b/src/qml/qml/ftw/qrecyclepool_p.h @@ -0,0 +1,220 @@ +/**************************************************************************** +** +** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies). +** Contact: http://www.qt-project.org/ +** +** This file is part of the QtQml module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** GNU Lesser General Public License Usage +** 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. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU General +** Public License version 3.0 as published by the Free Software Foundation +** and appearing in the file LICENSE.GPL included in the packaging of this +** file. Please review the following information to ensure the GNU General +** Public License version 3.0 requirements will be met: +** http://www.gnu.org/copyleft/gpl.html. +** +** Other Usage +** Alternatively, this file may be used in accordance with the terms and +** conditions contained in a signed written agreement between you and Nokia. +** +** +** +** +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#ifndef QRECYCLEPOOL_P_H +#define QRECYCLEPOOL_P_H + +// +// W A R N I N G +// ------------- +// +// This file is not part of the Qt API. It exists purely as an +// implementation detail. This header file may change from version to +// version without notice, or even be removed. +// +// We mean it. +// + +QT_BEGIN_NAMESPACE + +#define QRECYCLEPOOLCOOKIE 0x33218ADF + +template<typename T, int Step> +class QRecyclePoolPrivate +{ +public: + QRecyclePoolPrivate() + : recyclePoolHold(true), outstandingItems(0), cookie(QRECYCLEPOOLCOOKIE), + currentPage(0), nextAllocated(0) + { + } + + bool recyclePoolHold; + int outstandingItems; + quint32 cookie; + + struct PoolType : public T { + union { + QRecyclePoolPrivate<T, Step> *pool; + PoolType *nextAllocated; + }; + }; + + struct Page { + Page *nextPage; + unsigned int free; + union { + char array[Step * sizeof(PoolType)]; + qint64 q_for_alignment_1; + double q_for_alignment_2; + }; + }; + + Page *currentPage; + PoolType *nextAllocated; + + inline T *allocate(); + static inline void dispose(T *); + inline void releaseIfPossible(); +}; + +template<typename T, int Step = 1024> +class QRecyclePool +{ +public: + inline QRecyclePool(); + inline ~QRecyclePool(); + + inline T *New(); + template<typename T1> + inline T *New(const T1 &); + template<typename T1> + inline T *New(T1 &); + + static inline void Delete(T *); + +private: + QRecyclePoolPrivate<T, Step> *d; +}; + +template<typename T, int Step> +QRecyclePool<T, Step>::QRecyclePool() +: d(new QRecyclePoolPrivate<T, Step>()) +{ +} + +template<typename T, int Step> +QRecyclePool<T, Step>::~QRecyclePool() +{ + d->recyclePoolHold = false; + d->releaseIfPossible(); +} + +template<typename T, int Step> +T *QRecyclePool<T, Step>::New() +{ + T *rv = d->allocate(); + new (rv) T; + return rv; +} + +template<typename T, int Step> +template<typename T1> +T *QRecyclePool<T, Step>::New(const T1 &a) +{ + T *rv = d->allocate(); + new (rv) T(a); + return rv; +} + +template<typename T, int Step> +template<typename T1> +T *QRecyclePool<T, Step>::New(T1 &a) +{ + T *rv = d->allocate(); + new (rv) T(a); + return rv; +} + +template<typename T, int Step> +void QRecyclePool<T, Step>::Delete(T *t) +{ + t->~T(); + QRecyclePoolPrivate<T, Step>::dispose(t); +} + +template<typename T, int Step> +void QRecyclePoolPrivate<T, Step>::releaseIfPossible() +{ + if (recyclePoolHold || outstandingItems) + return; + + Page *p = currentPage; + while (p) { + Page *n = p->nextPage; + qFree(p); + p = n; + } + + delete this; +} + +template<typename T, int Step> +T *QRecyclePoolPrivate<T, Step>::allocate() +{ + PoolType *rv = 0; + if (nextAllocated) { + rv = nextAllocated; + nextAllocated = rv->nextAllocated; + } else if (currentPage && currentPage->free) { + rv = (PoolType *)(currentPage->array + (Step - currentPage->free) * sizeof(PoolType)); + currentPage->free--; + } else { + Page *p = (Page *)qMalloc(sizeof(Page)); + p->nextPage = currentPage; + p->free = Step; + currentPage = p; + + rv = (PoolType *)currentPage->array; + currentPage->free--; + } + + rv->pool = this; + ++outstandingItems; + return rv; +} + +template<typename T, int Step> +void QRecyclePoolPrivate<T, Step>::dispose(T *t) +{ + PoolType *pt = static_cast<PoolType *>(t); + Q_ASSERT(pt->pool && pt->pool->cookie == QRECYCLEPOOLCOOKIE); + + QRecyclePoolPrivate<T, Step> *This = pt->pool; + pt->nextAllocated = This->nextAllocated; + This->nextAllocated = pt; + --This->outstandingItems; + This->releaseIfPossible(); +} + +QT_END_NAMESPACE + +#endif // QRECYCLEPOOL_P_H |