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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include <Kernel/VM/AnonymousVMObject.h>
namespace Kernel {
class PurgeableVMObject final : public AnonymousVMObject {
public:
virtual ~PurgeableVMObject() override;
static NonnullRefPtr<PurgeableVMObject> create_with_size(size_t);
virtual NonnullRefPtr<VMObject> clone() override;
int purge();
int purge_with_interrupts_disabled(Badge<MemoryManager>);
bool was_purged() const { return m_was_purged; }
void set_was_purged(bool b) { m_was_purged = b; }
bool is_volatile() const { return m_volatile; }
void set_volatile(bool b) { m_volatile = b; }
private:
explicit PurgeableVMObject(size_t);
explicit PurgeableVMObject(const PurgeableVMObject&);
virtual const char* class_name() const override { return "PurgeableVMObject"; }
int purge_impl();
PurgeableVMObject& operator=(const PurgeableVMObject&) = delete;
PurgeableVMObject& operator=(PurgeableVMObject&&) = delete;
PurgeableVMObject(PurgeableVMObject&&) = delete;
virtual bool is_purgeable() const override { return true; }
bool m_was_purged { false };
bool m_volatile { false };
};
template<>
inline bool is<PurgeableVMObject>(const VMObject& vmobject)
{
return vmobject.is_purgeable();
}
}
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