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/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Atomic.h>
#include <AK/Types.h>
#include <Kernel/Arch/Spinlock.h>
#include <Kernel/Locking/LockRank.h>
namespace Kernel {
template<typename LockType>
class [[nodiscard]] SpinlockLocker {
AK_MAKE_NONCOPYABLE(SpinlockLocker);
public:
SpinlockLocker() = delete;
SpinlockLocker& operator=(SpinlockLocker&&) = delete;
SpinlockLocker(LockType& lock)
: m_lock(&lock)
{
VERIFY(m_lock);
m_prev_flags = m_lock->lock();
m_have_lock = true;
}
SpinlockLocker(SpinlockLocker&& from)
: m_lock(from.m_lock)
, m_prev_flags(from.m_prev_flags)
, m_have_lock(from.m_have_lock)
{
from.m_lock = nullptr;
from.m_prev_flags = 0;
from.m_have_lock = false;
}
~SpinlockLocker()
{
if (m_lock && m_have_lock) {
m_lock->unlock(m_prev_flags);
}
}
ALWAYS_INLINE void lock()
{
VERIFY(m_lock);
VERIFY(!m_have_lock);
m_prev_flags = m_lock->lock();
m_have_lock = true;
}
ALWAYS_INLINE void unlock()
{
VERIFY(m_lock);
VERIFY(m_have_lock);
m_lock->unlock(m_prev_flags);
m_prev_flags = 0;
m_have_lock = false;
}
[[nodiscard]] ALWAYS_INLINE bool have_lock() const
{
return m_have_lock;
}
private:
LockType* m_lock { nullptr };
u32 m_prev_flags { 0 };
bool m_have_lock { false };
};
}
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