mirror of
https://github.com/RGBCube/serenity
synced 2025-07-26 12:57:34 +00:00
Kernel: Serialize debug output
This commit is contained in:
parent
1da7fea602
commit
3ac6d31b45
5 changed files with 177 additions and 20 deletions
136
Kernel/SpinLock.h
Normal file
136
Kernel/SpinLock.h
Normal file
|
@ -0,0 +1,136 @@
|
|||
/*
|
||||
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
|
||||
* All rights reserved.
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions are met:
|
||||
*
|
||||
* 1. Redistributions of source code must retain the above copyright notice, this
|
||||
* list of conditions and the following disclaimer.
|
||||
*
|
||||
* 2. Redistributions in binary form must reproduce the above copyright notice,
|
||||
* this list of conditions and the following disclaimer in the documentation
|
||||
* and/or other materials provided with the distribution.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
||||
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||||
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
||||
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
|
||||
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
||||
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
||||
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
|
||||
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
||||
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
||||
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
||||
*/
|
||||
|
||||
#pragma once
|
||||
|
||||
#include <AK/Types.h>
|
||||
#include <AK/Atomic.h>
|
||||
#include <Kernel/Forward.h>
|
||||
#include <Kernel/Arch/i386/CPU.h>
|
||||
|
||||
namespace Kernel {
|
||||
|
||||
template <typename BaseType = u32>
|
||||
class SpinLock
|
||||
{
|
||||
AK::Atomic<BaseType> m_lock{0};
|
||||
|
||||
public:
|
||||
SpinLock() = default;
|
||||
SpinLock(const SpinLock&) = delete;
|
||||
SpinLock(SpinLock&&) = delete;
|
||||
|
||||
ALWAYS_INLINE void lock()
|
||||
{
|
||||
BaseType expected;
|
||||
do {
|
||||
expected = 0;
|
||||
} while (!m_lock.compare_exchange_strong(expected, 1, AK::memory_order_acq_rel));
|
||||
|
||||
}
|
||||
|
||||
ALWAYS_INLINE void unlock()
|
||||
{
|
||||
ASSERT(is_locked());
|
||||
m_lock.store(0, AK::memory_order_release);
|
||||
}
|
||||
|
||||
ALWAYS_INLINE bool is_locked() const
|
||||
{
|
||||
return m_lock.load(AK::memory_order_consume) != 0;
|
||||
}
|
||||
|
||||
ALWAYS_INLINE void initialize()
|
||||
{
|
||||
m_lock.store(0, AK::memory_order_release);
|
||||
}
|
||||
};
|
||||
|
||||
template <typename BaseType = u32, typename LockType = SpinLock<BaseType>>
|
||||
class ScopedSpinLock
|
||||
{
|
||||
LockType* m_lock;
|
||||
bool m_have_lock{false};
|
||||
bool m_flag{false};
|
||||
|
||||
public:
|
||||
ScopedSpinLock() = delete;
|
||||
|
||||
ScopedSpinLock(LockType& lock):
|
||||
m_lock(&lock)
|
||||
{
|
||||
ASSERT(m_lock);
|
||||
m_flag = cli_and_save_interrupt_flag();
|
||||
m_lock->lock();
|
||||
m_have_lock = true;
|
||||
}
|
||||
|
||||
ScopedSpinLock(ScopedSpinLock&& from):
|
||||
m_lock(from.m_lock),
|
||||
m_have_lock(from.m_have_lock),
|
||||
m_flag(from.m_flag)
|
||||
{
|
||||
from.m_lock = nullptr;
|
||||
from.m_have_lock = false;
|
||||
from.m_flag = false;
|
||||
}
|
||||
|
||||
ScopedSpinLock(const ScopedSpinLock&) = delete;
|
||||
|
||||
~ScopedSpinLock()
|
||||
{
|
||||
if (m_lock && m_have_lock) {
|
||||
m_lock->unlock();
|
||||
restore_interrupt_flag(m_flag);
|
||||
}
|
||||
}
|
||||
|
||||
ALWAYS_INLINE void lock()
|
||||
{
|
||||
ASSERT(m_lock);
|
||||
ASSERT(!m_have_lock);
|
||||
m_flag = cli_and_save_interrupt_flag();
|
||||
m_lock->lock();
|
||||
m_have_lock = true;
|
||||
}
|
||||
|
||||
ALWAYS_INLINE void unlock()
|
||||
{
|
||||
ASSERT(m_lock);
|
||||
ASSERT(m_have_lock);
|
||||
m_lock->unlock();
|
||||
m_have_lock = false;
|
||||
restore_interrupt_flag(m_flag);
|
||||
m_flag = false;
|
||||
}
|
||||
|
||||
ALWAYS_INLINE bool have_lock() const
|
||||
{
|
||||
return m_have_lock;
|
||||
}
|
||||
};
|
||||
|
||||
}
|
Loading…
Add table
Add a link
Reference in a new issue