mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-12-25 15:39:55 +00:00
f72e5bbb17
This feels a lot more consistent and Unixy:
create_shared_buffer() => shbuf_create()
share_buffer_with() => shbuf_allow_pid()
share_buffer_globally() => shbuf_allow_all()
get_shared_buffer() => shbuf_get()
release_shared_buffer() => shbuf_release()
seal_shared_buffer() => shbuf_seal()
get_shared_buffer_size() => shbuf_get_size()
Also, "shared_buffer_id" is shortened to "shbuf_id" all around.
90 lines
3 KiB
C++
90 lines
3 KiB
C++
/*
|
|
* 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 <AK/OwnPtr.h>
|
|
#include <AK/WeakPtr.h>
|
|
#include <Kernel/VM/MemoryManager.h>
|
|
#include <Kernel/VM/PurgeableVMObject.h>
|
|
|
|
namespace Kernel {
|
|
|
|
class SharedBuffer {
|
|
private:
|
|
struct Reference {
|
|
Reference(pid_t pid)
|
|
: pid(pid)
|
|
{
|
|
}
|
|
|
|
pid_t pid;
|
|
unsigned count { 0 };
|
|
WeakPtr<Region> region;
|
|
};
|
|
|
|
public:
|
|
SharedBuffer(int id, int size)
|
|
: m_shbuf_id(id)
|
|
, m_vmobject(PurgeableVMObject::create_with_size(size))
|
|
{
|
|
#ifdef SHARED_BUFFER_DEBUG
|
|
dbg() << "Created shared buffer " << m_shbuf_id << " of size " << size;
|
|
#endif
|
|
}
|
|
|
|
~SharedBuffer()
|
|
{
|
|
#ifdef SHARED_BUFFER_DEBUG
|
|
dbg() << "Destroyed shared buffer " << m_shbuf_id << " of size " << size();
|
|
#endif
|
|
}
|
|
|
|
void sanity_check(const char* what);
|
|
bool is_shared_with(pid_t peer_pid);
|
|
void* ref_for_process_and_get_address(Process& process);
|
|
void share_with(pid_t peer_pid);
|
|
void share_globally() { m_global = true; }
|
|
void deref_for_process(Process& process);
|
|
void disown(pid_t pid);
|
|
size_t size() const { return m_vmobject->size(); }
|
|
void destroy_if_unused();
|
|
void seal();
|
|
PurgeableVMObject& vmobject() { return m_vmobject; }
|
|
const PurgeableVMObject& vmobject() const { return m_vmobject; }
|
|
int id() const { return m_shbuf_id; }
|
|
|
|
int m_shbuf_id { -1 };
|
|
bool m_writable { true };
|
|
bool m_global { false };
|
|
NonnullRefPtr<PurgeableVMObject> m_vmobject;
|
|
Vector<Reference, 2> m_refs;
|
|
unsigned m_total_refs { 0 };
|
|
};
|
|
|
|
Lockable<HashMap<int, NonnullOwnPtr<SharedBuffer>>>& shared_buffers();
|
|
|
|
}
|