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https://github.com/RGBCube/serenity
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Kernel: Rename SpinLock => Spinlock
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parent
7d5d26b048
commit
55adace359
110 changed files with 491 additions and 491 deletions
180
Kernel/Locking/Spinlock.h
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180
Kernel/Locking/Spinlock.h
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/*
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* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Atomic.h>
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#include <AK/Types.h>
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#include <Kernel/Arch/x86/Processor.h>
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#include <Kernel/Forward.h>
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namespace Kernel {
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template<typename BaseType = u32>
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class Spinlock {
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AK_MAKE_NONCOPYABLE(Spinlock);
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AK_MAKE_NONMOVABLE(Spinlock);
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public:
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Spinlock() = default;
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ALWAYS_INLINE u32 lock()
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{
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u32 prev_flags = cpu_flags();
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Processor::enter_critical();
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cli();
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while (m_lock.exchange(1, AK::memory_order_acquire) != 0) {
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Processor::wait_check();
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}
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return prev_flags;
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}
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ALWAYS_INLINE void unlock(u32 prev_flags)
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{
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VERIFY(is_locked());
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m_lock.store(0, AK::memory_order_release);
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if (prev_flags & 0x200)
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sti();
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else
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cli();
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Processor::leave_critical();
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}
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[[nodiscard]] ALWAYS_INLINE bool is_locked() const
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{
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return m_lock.load(AK::memory_order_relaxed) != 0;
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}
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ALWAYS_INLINE void initialize()
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{
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m_lock.store(0, AK::memory_order_relaxed);
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}
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private:
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Atomic<BaseType> m_lock { 0 };
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};
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class RecursiveSpinlock {
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AK_MAKE_NONCOPYABLE(RecursiveSpinlock);
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AK_MAKE_NONMOVABLE(RecursiveSpinlock);
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public:
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RecursiveSpinlock() = default;
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ALWAYS_INLINE u32 lock()
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{
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u32 prev_flags = cpu_flags();
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cli();
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Processor::enter_critical();
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auto& proc = Processor::current();
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FlatPtr cpu = FlatPtr(&proc);
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FlatPtr expected = 0;
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while (!m_lock.compare_exchange_strong(expected, cpu, AK::memory_order_acq_rel)) {
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if (expected == cpu)
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break;
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Processor::wait_check();
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expected = 0;
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}
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m_recursions++;
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return prev_flags;
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}
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ALWAYS_INLINE void unlock(u32 prev_flags)
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{
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VERIFY(m_recursions > 0);
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VERIFY(m_lock.load(AK::memory_order_relaxed) == FlatPtr(&Processor::current()));
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if (--m_recursions == 0)
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m_lock.store(0, AK::memory_order_release);
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if (prev_flags & 0x200)
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sti();
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else
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cli();
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Processor::leave_critical();
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}
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[[nodiscard]] ALWAYS_INLINE bool is_locked() const
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{
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return m_lock.load(AK::memory_order_relaxed) != 0;
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}
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[[nodiscard]] ALWAYS_INLINE bool own_lock() const
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{
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return m_lock.load(AK::memory_order_relaxed) == FlatPtr(&Processor::current());
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}
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ALWAYS_INLINE void initialize()
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{
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m_lock.store(0, AK::memory_order_relaxed);
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}
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private:
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Atomic<FlatPtr> m_lock { 0 };
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u32 m_recursions { 0 };
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};
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template<typename LockType>
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class [[nodiscard]] ScopedSpinlock {
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AK_MAKE_NONCOPYABLE(ScopedSpinlock);
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public:
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ScopedSpinlock() = delete;
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ScopedSpinlock& operator=(ScopedSpinlock&&) = delete;
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ScopedSpinlock(LockType& lock)
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: m_lock(&lock)
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{
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VERIFY(m_lock);
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m_prev_flags = m_lock->lock();
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m_have_lock = true;
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}
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ScopedSpinlock(ScopedSpinlock&& from)
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: m_lock(from.m_lock)
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, m_prev_flags(from.m_prev_flags)
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, m_have_lock(from.m_have_lock)
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{
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from.m_lock = nullptr;
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from.m_prev_flags = 0;
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from.m_have_lock = false;
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}
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~ScopedSpinlock()
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{
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if (m_lock && m_have_lock) {
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m_lock->unlock(m_prev_flags);
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}
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}
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ALWAYS_INLINE void lock()
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{
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VERIFY(m_lock);
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VERIFY(!m_have_lock);
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m_prev_flags = m_lock->lock();
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m_have_lock = true;
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}
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ALWAYS_INLINE void unlock()
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{
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VERIFY(m_lock);
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VERIFY(m_have_lock);
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m_lock->unlock(m_prev_flags);
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m_prev_flags = 0;
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m_have_lock = false;
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}
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[[nodiscard]] ALWAYS_INLINE bool have_lock() const
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{
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return m_have_lock;
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}
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private:
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LockType* m_lock { nullptr };
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u32 m_prev_flags { 0 };
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bool m_have_lock { false };
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};
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}
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