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.
44 lines
1,016 B
C++
44 lines
1,016 B
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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#include <AK/Singleton.h>
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#include <Kernel/Memory/MemoryManager.h>
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#include <Kernel/Memory/VMObject.h>
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namespace Kernel::Memory {
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static Singleton<SpinLockProtectedValue<VMObject::AllInstancesList>> s_all_instances;
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SpinLockProtectedValue<VMObject::AllInstancesList>& VMObject::all_instances()
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{
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return s_all_instances;
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}
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VMObject::VMObject(VMObject const& other)
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: m_physical_pages(other.m_physical_pages)
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{
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all_instances().with([&](auto& list) { list.append(*this); });
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}
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VMObject::VMObject(size_t size)
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: m_physical_pages(ceil_div(size, static_cast<size_t>(PAGE_SIZE)))
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{
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all_instances().with([&](auto& list) { list.append(*this); });
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}
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VMObject::~VMObject()
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{
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{
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ScopedSpinLock lock(m_on_deleted_lock);
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for (auto& it : m_on_deleted)
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it->vmobject_deleted(*this);
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m_on_deleted.clear();
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}
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VERIFY(m_regions.is_empty());
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}
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}
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