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AK+Kernel: Add AK::AtomicRefCounted and use everywhere in the kernel

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Instead of having two separate implementations of AK::RefCounted, one
for userspace and one for kernelspace, there is now RefCounted and
AtomicRefCounted.
This commit is contained in:
Andreas Kling 2022-08-19 17:26:07 +02:00
parent 4889eb019a
commit e475263113
45 changed files with 81 additions and 94 deletions
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4
Kernel/Library/ListedRefCounted.h
View file

@ -6,7 +6,7 @@
#pragma once
#include <AK/RefCounted.h>
#include <AK/AtomicRefCounted.h>
namespace Kernel {
@ -21,7 +21,7 @@ enum class LockType {
};
template<typename T, LockType Lock>
class ListedRefCounted : public RefCountedBase {
class ListedRefCounted : public AtomicRefCountedBase {
public:
bool unref() const
{

87
Kernel/Library/ThreadSafeRefCounted.h
View file

@ -1,87 +0,0 @@
/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Assertions.h>
#include <AK/Atomic.h>
#include <AK/Checked.h>
#include <AK/Noncopyable.h>
#include <AK/Platform.h>
#include <AK/StdLibExtras.h>
namespace AK {
class RefCountedBase {
AK_MAKE_NONCOPYABLE(RefCountedBase);
AK_MAKE_NONMOVABLE(RefCountedBase);
public:
using RefCountType = unsigned int;
using AllowOwnPtr = FalseType;
void ref() const
{
auto old_ref_count = m_ref_count.fetch_add(1, AK::MemoryOrder::memory_order_relaxed);
VERIFY(old_ref_count > 0);
VERIFY(!Checked<RefCountType>::addition_would_overflow(old_ref_count, 1));
}
[[nodiscard]] bool try_ref() const
{
RefCountType expected = m_ref_count.load(AK::MemoryOrder::memory_order_relaxed);
for (;;) {
if (expected == 0)
return false;
VERIFY(!Checked<RefCountType>::addition_would_overflow(expected, 1));
if (m_ref_count.compare_exchange_strong(expected, expected + 1, AK::MemoryOrder::memory_order_acquire))
return true;
}
}
[[nodiscard]] RefCountType ref_count() const
{
return m_ref_count.load(AK::MemoryOrder::memory_order_relaxed);
}
protected:
RefCountedBase() = default;
~RefCountedBase()
{
VERIFY(m_ref_count.load(AK::MemoryOrder::memory_order_relaxed) == 0);
}
RefCountType deref_base() const
{
auto old_ref_count = m_ref_count.fetch_sub(1, AK::MemoryOrder::memory_order_acq_rel);
VERIFY(old_ref_count > 0);
return old_ref_count - 1;
}
mutable Atomic<RefCountType> m_ref_count { 1 };
};
template<typename T>
class RefCounted : public RefCountedBase {
public:
bool unref() const
{
auto* that = const_cast<T*>(static_cast<T const*>(this));
auto new_ref_count = deref_base();
if (new_ref_count == 0) {
if constexpr (requires { that->will_be_destroyed(); })
that->will_be_destroyed();
delete that;
return true;
}
return false;
}
};
}
using AK::RefCounted;
using AK::RefCountedBase;

4
Kernel/Library/ThreadSafeWeakPtr.h
View file

@ -168,7 +168,7 @@ template<typename T>
template<typename U>
inline ErrorOr<WeakPtr<U>> Weakable<T>::try_make_weak_ptr() const
{
if constexpr (IsBaseOf<RefCountedBase, T>) {
if constexpr (IsBaseOf<AtomicRefCountedBase, T>) {
// Checking m_being_destroyed isn't sufficient when dealing with
// a RefCounted type.The reference count will drop to 0 before the
// destructor is invoked and revoke_weak_ptrs is called. So, try
@ -192,7 +192,7 @@ inline ErrorOr<WeakPtr<U>> Weakable<T>::try_make_weak_ptr() const
WeakPtr<U> weak_ptr(m_link);
if constexpr (IsBaseOf<RefCountedBase, T>) {
if constexpr (IsBaseOf<AtomicRefCountedBase, T>) {
// Now drop the reference we temporarily added
if (static_cast<const T*>(this)->unref()) {
// We just dropped the last reference, which should have called

6
Kernel/Library/ThreadSafeWeakable.h
View file

@ -8,7 +8,7 @@
#include <AK/Assertions.h>
#include <AK/Atomic.h>
#include <AK/RefCounted.h>
#include <AK/AtomicRefCounted.h>
#include <AK/RefPtr.h>
#include <AK/StdLibExtras.h>
#include <Kernel/Arch/Processor.h>
@ -21,7 +21,7 @@ class Weakable;
template<typename T>
class WeakPtr;
class WeakLink : public RefCounted<WeakLink> {
class WeakLink final : public AtomicRefCounted<WeakLink> {
template<typename T>
friend class Weakable;
template<typename T>
@ -30,7 +30,7 @@ class WeakLink : public RefCounted<WeakLink> {
public:
template<typename T, typename PtrTraits = RefPtrTraits<T>>
RefPtr<T, PtrTraits> strong_ref() const
requires(IsBaseOf<RefCountedBase, T>)
requires(IsBaseOf<AtomicRefCountedBase, T>)
{
RefPtr<T, PtrTraits> ref;