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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
#if defined(__serenity__) || defined(__linux__)
# include <AK/RefCounted.h>
# include <AK/RefPtr.h>
namespace AK {
class SharedBuffer : public RefCounted<SharedBuffer> {
public:
static RefPtr<SharedBuffer> create_with_size(int);
static RefPtr<SharedBuffer> create_from_shbuf_id(int);
~SharedBuffer();
bool share_globally();
bool share_with(pid_t);
int shbuf_id() const { return m_shbuf_id; }
void seal();
int size() const { return m_size; }
template<typename T>
T* data()
{
static_assert(IsVoid<T>::value || is_trivial<T>());
return (T*)m_data;
}
template<typename T>
const T* data() const
{
static_assert(IsVoid<T>::value || is_trivial<T>());
return (const T*)m_data;
}
void set_volatile();
[[nodiscard]] bool set_nonvolatile();
private:
SharedBuffer(int shbuf_id, int size, void*);
int m_shbuf_id { -1 };
int m_size { 0 };
void* m_data { nullptr };
};
}
using AK::SharedBuffer;
#endif
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