ladybird/AK/RefCounted.cpp
Andreas Kling 66f3ec687b AK: Move RefCountedBase definitions out-of-line
This dramatically reduces code size since we no longer inline all these
VERIFY() checks everywhere. Appears to be performance neutral.
2021-05-29 20:18:57 +02:00

48 lines
1.3 KiB
C++

/*
* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/RefCounted.h>
namespace AK {
RefCountedBase::~RefCountedBase()
{
VERIFY(m_ref_count.load(AK::MemoryOrder::memory_order_relaxed) == 0);
}
void RefCountedBase::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 RefCountedBase::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;
}
}
RefCountedBase::RefCountType RefCountedBase::ref_count() const
{
return m_ref_count.load(AK::MemoryOrder::memory_order_relaxed);
}
RefCountedBase::RefCountType RefCountedBase::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;
}
}