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Kernel: Tidy up SpinLock and related classes a little bit

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This commit is contained in:
Andreas Kling 2020-07-06 11:36:07 +02:00
parent 163c9d5f8f
commit e83c36d053
Notes: sideshowbarker 2024-07-19 05:07:14 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/e83c36d053c
1 changed files with 31 additions and 34 deletions
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65
Kernel/SpinLock.h
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@ -26,24 +26,20 @@
#pragma once
#include <AK/Types.h>
#include <AK/Atomic.h>
#include <Kernel/Forward.h>
#include <AK/Types.h>
#include <Kernel/Arch/i386/CPU.h>
#include <Kernel/Forward.h>
namespace Kernel {
template <typename BaseType = u32>
class SpinLock
{
AK::Atomic<BaseType> m_lock{0};
template<typename BaseType = u32>
class SpinLock {
AK_MAKE_NONCOPYABLE(SpinLock);
AK_MAKE_NONMOVABLE(SpinLock);
public:
SpinLock() = default;
SpinLock(const SpinLock&) = delete;
SpinLock(SpinLock&&) = delete;
SpinLock& operator=(const SpinLock&) = delete;
SpinLock& operator=(SpinLock&&) = delete;
ALWAYS_INLINE u32 lock()
{
@ -54,7 +50,6 @@ public:
expected = 0;
} while (!m_lock.compare_exchange_strong(expected, 1, AK::memory_order_acq_rel));
return prev_flags;
}
ALWAYS_INLINE void unlock(u32 prev_flags)
@ -73,19 +68,17 @@ public:
{
m_lock.store(0, AK::memory_order_release);
}
private:
AK::Atomic<BaseType> m_lock { 0 };
};
class RecursiveSpinLock
{
AK::Atomic<FlatPtr> m_lock{0};
u32 m_recursions{0};
class RecursiveSpinLock {
AK_MAKE_NONCOPYABLE(RecursiveSpinLock);
AK_MAKE_NONMOVABLE(RecursiveSpinLock);
public:
RecursiveSpinLock() = default;
RecursiveSpinLock(const RecursiveSpinLock&) = delete;
RecursiveSpinLock(RecursiveSpinLock&&) = delete;
RecursiveSpinLock& operator=(const RecursiveSpinLock&) = delete;
RecursiveSpinLock& operator=(RecursiveSpinLock&&) = delete;
ALWAYS_INLINE u32 lock()
{
@ -98,7 +91,7 @@ public:
if (expected == cpu)
break;
expected = 0;
}
}
m_recursions++;
return prev_flags;
}
@ -121,33 +114,32 @@ public:
{
m_lock.store(0, AK::memory_order_release);
}
private:
AK::Atomic<FlatPtr> m_lock { 0 };
u32 m_recursions { 0 };
};
template <typename BaseType = u32, typename LockType = SpinLock<BaseType>>
class ScopedSpinLock
{
LockType* m_lock;
u32 m_prev_flags{0};
bool m_have_lock{false};
template<typename BaseType = u32, typename LockType = SpinLock<BaseType>>
class ScopedSpinLock {
AK_MAKE_NONCOPYABLE(ScopedSpinLock);
public:
ScopedSpinLock() = delete;
ScopedSpinLock(const ScopedSpinLock&) = delete;
ScopedSpinLock& operator=(const ScopedSpinLock&) = delete;
ScopedSpinLock& operator=(ScopedSpinLock&&) = delete;
ScopedSpinLock(LockType& lock):
m_lock(&lock)
ScopedSpinLock(LockType& lock)
: m_lock(&lock)
{
ASSERT(m_lock);
m_prev_flags = m_lock->lock();
m_have_lock = true;
}
ScopedSpinLock(ScopedSpinLock&& from):
m_lock(from.m_lock),
m_prev_flags(from.m_prev_flags),
m_have_lock(from.m_have_lock)
ScopedSpinLock(ScopedSpinLock&& 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;
@ -182,6 +174,11 @@ public:
{
return m_have_lock;
}
private:
LockType* m_lock { nullptr };
u32 m_prev_flags { 0 };
bool m_have_lock { false };
};
}