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https://github.com/SerenityOS/serenity
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![Andreas Kling](/assets/img/avatar_default.png)
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++
/*
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* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/FixedArray.h>
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#include <AK/HashTable.h>
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#include <AK/IntrusiveList.h>
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#include <AK/RefCounted.h>
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#include <AK/RefPtr.h>
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#include <AK/Vector.h>
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#include <AK/Weakable.h>
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#include <Kernel/Forward.h>
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#include <Kernel/Library/ListedRefCounted.h>
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#include <Kernel/Locking/Mutex.h>
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#include <Kernel/Memory/Region.h>
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namespace Kernel::Memory {
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class VMObjectDeletedHandler {
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public:
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virtual ~VMObjectDeletedHandler() = default;
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virtual void vmobject_deleted(VMObject&) = 0;
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};
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class VMObject
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: public ListedRefCounted<VMObject>
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, public Weakable<VMObject> {
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friend class MemoryManager;
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friend class Region;
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public:
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virtual ~VMObject();
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virtual KResultOr<NonnullRefPtr<VMObject>> try_clone() = 0;
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virtual bool is_anonymous() const { return false; }
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virtual bool is_inode() const { return false; }
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virtual bool is_shared_inode() const { return false; }
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virtual bool is_private_inode() const { return false; }
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virtual bool is_contiguous() const { return false; }
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size_t page_count() const { return m_physical_pages.size(); }
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Span<RefPtr<PhysicalPage> const> physical_pages() const { return m_physical_pages.span(); }
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Span<RefPtr<PhysicalPage>> physical_pages() { return m_physical_pages.span(); }
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size_t size() const { return m_physical_pages.size() * PAGE_SIZE; }
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virtual StringView class_name() const = 0;
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ALWAYS_INLINE void add_region(Region& region)
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{
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ScopedSpinLock locker(m_lock);
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m_regions.append(region);
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}
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ALWAYS_INLINE void remove_region(Region& region)
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{
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ScopedSpinLock locker(m_lock);
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m_regions.remove(region);
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}
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void register_on_deleted_handler(VMObjectDeletedHandler& handler)
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{
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ScopedSpinLock locker(m_on_deleted_lock);
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m_on_deleted.set(&handler);
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}
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void unregister_on_deleted_handler(VMObjectDeletedHandler& handler)
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{
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ScopedSpinLock locker(m_on_deleted_lock);
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m_on_deleted.remove(&handler);
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}
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protected:
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explicit VMObject(size_t);
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explicit VMObject(VMObject const&);
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template<typename Callback>
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void for_each_region(Callback);
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IntrusiveListNode<VMObject> m_list_node;
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FixedArray<RefPtr<PhysicalPage>> m_physical_pages;
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mutable RecursiveSpinLock m_lock;
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private:
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VMObject& operator=(VMObject const&) = delete;
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VMObject& operator=(VMObject&&) = delete;
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VMObject(VMObject&&) = delete;
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HashTable<VMObjectDeletedHandler*> m_on_deleted;
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SpinLock<u8> m_on_deleted_lock;
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Region::ListInVMObject m_regions;
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public:
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using AllInstancesList = IntrusiveList<VMObject, RawPtr<VMObject>, &VMObject::m_list_node>;
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static SpinLockProtectedValue<VMObject::AllInstancesList>& all_instances();
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};
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template<typename Callback>
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inline void VMObject::for_each_region(Callback callback)
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{
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ScopedSpinLock lock(m_lock);
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for (auto& region : m_regions) {
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callback(region);
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}
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}
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inline PhysicalPage const* Region::physical_page(size_t index) const
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{
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VERIFY(index < page_count());
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return vmobject().physical_pages()[first_page_index() + index];
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}
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inline RefPtr<PhysicalPage>& Region::physical_page_slot(size_t index)
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{
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VERIFY(index < page_count());
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return vmobject().physical_pages()[first_page_index() + index];
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}
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}
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