qmemory_resource_tlsf_p.h

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// Copyright (C) 2025 The Qt Company Ltd.

// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only

#ifndef QMEMORY_RESOURCE_TLSF_P_H

#define QMEMORY_RESOURCE_TLSF_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.

//

#include <QtMultimedia/private/qtmm_pmr_p.h>

#include <QtMultimedia/qtmultimediaglobal.h>

#include <QtCore/qtclasshelpermacros.h>

#include <new>

QT_BEGIN_NAMESPACE

namespace QtPrivate {

typedef void *tlsf_t;

namespace QtMultimediaPrivate {

struct QTlsfMemoryResource final : pmr::memory_resource

    Q_MULTIMEDIA_EXPORT

    explicit QTlsfMemoryResource(std::size_t preallocatedBytes,

                                 pmr::memory_resource *upstream = pmr::get_default_resource());

    Q_DISABLE_COPY_MOVE(QTlsfMemoryResource)

    Q_MULTIMEDIA_EXPORT

    ~QTlsfMemoryResource() override;

private:

    void *do_allocate(size_t bytes, size_t alignment) override;

    void do_deallocate(void *p, size_t bytes, size_t alignment) override;

    bool do_is_equal(const memory_resource &other) const noexcept override;

    // cache line alignment on most platforms

    static constexpr auto poolAlignment = std::align_val_t{ 128 };

    QtPrivate::tlsf_t m_tlsf;

    const size_t m_allocationSize;

    std::byte *m_buffer = nullptr;

    pmr::memory_resource *m_upstream{};

};

} // namespace QtMultimediaPrivate

QT_END_NAMESPACE

#endif // QMEMORY_RESOURCE_TLSF_P_H