/*
 * Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
 *
 * SPDX-License-Identifier: BSD-2-Clause
 */

#include <Kernel/Library/ScopedCritical.h>

#include <Kernel/Arch/Processor.h>

namespace Kernel {

ScopedCritical::ScopedCritical()
{
    enter();
}

ScopedCritical::~ScopedCritical()
{
    if (m_valid)
        leave();
}

ScopedCritical::ScopedCritical(ScopedCritical&& from)
    : m_valid(exchange(from.m_valid, false))
{
}

ScopedCritical& ScopedCritical::operator=(ScopedCritical&& from)
{
    if (&from != this) {
        m_valid = exchange(from.m_valid, false);
    }
    return *this;
}

void ScopedCritical::leave()
{
    VERIFY(m_valid);
    m_valid = false;
    Processor::leave_critical();
}

void ScopedCritical::enter()
{
    VERIFY(!m_valid);
    m_valid = true;
    Processor::enter_critical();
}

}