mirror of
https://github.com/SerenityOS/serenity
synced 2024-09-06 17:06:31 +00:00
7979b5a8bb
The VMObject class now manages its own instance list (it was previously a member of MemoryManager.) Removal from the list is done safely on the last unref(), closing a race window in the previous implementation. Note that VMObject::all_instances() now has its own lock instead of using the global MM lock.
126 lines
3.4 KiB
C++
126 lines
3.4 KiB
C++
/*
|
|
* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <AK/FixedArray.h>
|
|
#include <AK/HashTable.h>
|
|
#include <AK/IntrusiveList.h>
|
|
#include <AK/RefCounted.h>
|
|
#include <AK/RefPtr.h>
|
|
#include <AK/Vector.h>
|
|
#include <AK/Weakable.h>
|
|
#include <Kernel/Forward.h>
|
|
#include <Kernel/Library/ListedRefCounted.h>
|
|
#include <Kernel/Locking/Mutex.h>
|
|
#include <Kernel/Memory/Region.h>
|
|
|
|
namespace Kernel::Memory {
|
|
|
|
class VMObjectDeletedHandler {
|
|
public:
|
|
virtual ~VMObjectDeletedHandler() = default;
|
|
virtual void vmobject_deleted(VMObject&) = 0;
|
|
};
|
|
|
|
class VMObject
|
|
: public ListedRefCounted<VMObject>
|
|
, public Weakable<VMObject> {
|
|
friend class MemoryManager;
|
|
friend class Region;
|
|
|
|
public:
|
|
virtual ~VMObject();
|
|
|
|
virtual KResultOr<NonnullRefPtr<VMObject>> try_clone() = 0;
|
|
|
|
virtual bool is_anonymous() const { return false; }
|
|
virtual bool is_inode() const { return false; }
|
|
virtual bool is_shared_inode() const { return false; }
|
|
virtual bool is_private_inode() const { return false; }
|
|
virtual bool is_contiguous() const { return false; }
|
|
|
|
size_t page_count() const { return m_physical_pages.size(); }
|
|
Span<RefPtr<PhysicalPage> const> physical_pages() const { return m_physical_pages.span(); }
|
|
Span<RefPtr<PhysicalPage>> physical_pages() { return m_physical_pages.span(); }
|
|
|
|
size_t size() const { return m_physical_pages.size() * PAGE_SIZE; }
|
|
|
|
virtual StringView class_name() const = 0;
|
|
|
|
ALWAYS_INLINE void add_region(Region& region)
|
|
{
|
|
ScopedSpinLock locker(m_lock);
|
|
m_regions.append(region);
|
|
}
|
|
|
|
ALWAYS_INLINE void remove_region(Region& region)
|
|
{
|
|
ScopedSpinLock locker(m_lock);
|
|
m_regions.remove(region);
|
|
}
|
|
|
|
void register_on_deleted_handler(VMObjectDeletedHandler& handler)
|
|
{
|
|
ScopedSpinLock locker(m_on_deleted_lock);
|
|
m_on_deleted.set(&handler);
|
|
}
|
|
void unregister_on_deleted_handler(VMObjectDeletedHandler& handler)
|
|
{
|
|
ScopedSpinLock locker(m_on_deleted_lock);
|
|
m_on_deleted.remove(&handler);
|
|
}
|
|
|
|
protected:
|
|
explicit VMObject(size_t);
|
|
explicit VMObject(VMObject const&);
|
|
|
|
template<typename Callback>
|
|
void for_each_region(Callback);
|
|
|
|
IntrusiveListNode<VMObject> m_list_node;
|
|
FixedArray<RefPtr<PhysicalPage>> m_physical_pages;
|
|
|
|
mutable RecursiveSpinLock m_lock;
|
|
|
|
private:
|
|
VMObject& operator=(VMObject const&) = delete;
|
|
VMObject& operator=(VMObject&&) = delete;
|
|
VMObject(VMObject&&) = delete;
|
|
|
|
HashTable<VMObjectDeletedHandler*> m_on_deleted;
|
|
SpinLock<u8> m_on_deleted_lock;
|
|
|
|
Region::ListInVMObject m_regions;
|
|
|
|
public:
|
|
using AllInstancesList = IntrusiveList<VMObject, RawPtr<VMObject>, &VMObject::m_list_node>;
|
|
static SpinLockProtectedValue<VMObject::AllInstancesList>& all_instances();
|
|
};
|
|
|
|
template<typename Callback>
|
|
inline void VMObject::for_each_region(Callback callback)
|
|
{
|
|
ScopedSpinLock lock(m_lock);
|
|
for (auto& region : m_regions) {
|
|
callback(region);
|
|
}
|
|
}
|
|
|
|
inline PhysicalPage const* Region::physical_page(size_t index) const
|
|
{
|
|
VERIFY(index < page_count());
|
|
return vmobject().physical_pages()[first_page_index() + index];
|
|
}
|
|
|
|
inline RefPtr<PhysicalPage>& Region::physical_page_slot(size_t index)
|
|
{
|
|
VERIFY(index < page_count());
|
|
return vmobject().physical_pages()[first_page_index() + index];
|
|
}
|
|
|
|
}
|