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2c72d495a3
I believe this to be safe, as the main thing that LockRefPtr provides over RefPtr is safe copying from a shared LockRefPtr instance. I've inspected the uses of RefPtr<PhysicalPage> and it seems they're all guarded by external locking. Some of it is less obvious, but this is an area where we're making continuous headway.
91 lines
2.5 KiB
C++
91 lines
2.5 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/IntrusiveList.h>
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#include <AK/RefPtr.h>
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#include <Kernel/Forward.h>
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#include <Kernel/Library/ListedRefCounted.h>
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#include <Kernel/Library/LockWeakable.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 VMObject
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: public ListedRefCounted<VMObject, LockType::Spinlock>
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, public LockWeakable<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 ErrorOr<NonnullLockRefPtr<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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size_t page_count() const { return m_physical_pages.size(); }
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virtual Span<RefPtr<PhysicalPage> const> physical_pages() const { return m_physical_pages.span(); }
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virtual 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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SpinlockLocker 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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SpinlockLocker locker(m_lock);
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m_regions.remove(region);
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}
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protected:
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static ErrorOr<FixedArray<RefPtr<PhysicalPage>>> try_create_physical_pages(size_t);
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ErrorOr<FixedArray<RefPtr<PhysicalPage>>> try_clone_physical_pages() const;
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explicit VMObject(FixedArray<RefPtr<PhysicalPage>>&&);
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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 { LockRank::None };
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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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Region::ListInVMObject m_regions;
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public:
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using AllInstancesList = IntrusiveList<&VMObject::m_list_node>;
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static SpinlockProtected<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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SpinlockLocker 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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}
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