mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-12-25 20:22:18 +03:00
a4b4b358ff
This mechanism was unsafe to use in any multithreaded context, since the hook function was invoked on a raw pointer *after* decrementing the local ref count. Since we don't use it for anything anymore, let's just get rid of it.
83 lines
1.7 KiB
C++
83 lines
1.7 KiB
C++
/*
|
|
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#ifdef KERNEL
|
|
# include <Kernel/Library/ThreadSafeRefCounted.h>
|
|
#else
|
|
|
|
# include <AK/Assertions.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;
|
|
|
|
ALWAYS_INLINE void ref() const
|
|
{
|
|
VERIFY(m_ref_count > 0);
|
|
VERIFY(!Checked<RefCountType>::addition_would_overflow(m_ref_count, 1));
|
|
++m_ref_count;
|
|
}
|
|
|
|
[[nodiscard]] bool try_ref() const
|
|
{
|
|
if (m_ref_count == 0)
|
|
return false;
|
|
ref();
|
|
return true;
|
|
}
|
|
|
|
[[nodiscard]] RefCountType ref_count() const { return m_ref_count; }
|
|
|
|
protected:
|
|
RefCountedBase() = default;
|
|
~RefCountedBase() { VERIFY(!m_ref_count); }
|
|
|
|
ALWAYS_INLINE RefCountType deref_base() const
|
|
{
|
|
VERIFY(m_ref_count);
|
|
return --m_ref_count;
|
|
}
|
|
|
|
RefCountType mutable 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 static_cast<const T*>(this);
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
};
|
|
|
|
}
|
|
|
|
using AK::RefCounted;
|
|
using AK::RefCountedBase;
|
|
|
|
#endif
|