forked from suyu/suyu
74 lines
2.3 KiB
C++
74 lines
2.3 KiB
C++
// Copyright 2020 yuzu Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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// This file references various implementation details from Atmosphere, an open-source firmware for
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// the Nintendo Switch. Copyright 2018-2020 Atmosphere-NX.
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#pragma once
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#include "common/assert.h"
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#include "common/spin_lock.h"
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#include "core/hardware_properties.h"
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#include "core/hle/kernel/kernel.h"
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namespace Kernel {
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class KernelCore;
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template <typename SchedulerType>
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class KAbstractSchedulerLock {
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public:
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explicit KAbstractSchedulerLock(KernelCore& kernel_) : kernel{kernel_} {}
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bool IsLockedByCurrentThread() const {
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return this->owner_thread == kernel.GetCurrentEmuThreadID();
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}
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void Lock() {
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if (this->IsLockedByCurrentThread()) {
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// If we already own the lock, we can just increment the count.
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ASSERT(this->lock_count > 0);
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this->lock_count++;
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} else {
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// Otherwise, we want to disable scheduling and acquire the spinlock.
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SchedulerType::DisableScheduling(kernel);
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this->spin_lock.lock();
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// For debug, ensure that our state is valid.
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ASSERT(this->lock_count == 0);
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ASSERT(this->owner_thread == EmuThreadHandleInvalid);
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// Increment count, take ownership.
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this->lock_count = 1;
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this->owner_thread = kernel.GetCurrentEmuThreadID();
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}
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}
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void Unlock() {
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ASSERT(this->IsLockedByCurrentThread());
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ASSERT(this->lock_count > 0);
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// Release an instance of the lock.
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if ((--this->lock_count) == 0) {
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// We're no longer going to hold the lock. Take note of what cores need scheduling.
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const u64 cores_needing_scheduling =
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SchedulerType::UpdateHighestPriorityThreads(kernel);
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// Note that we no longer hold the lock, and unlock the spinlock.
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this->owner_thread = EmuThreadHandleInvalid;
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this->spin_lock.unlock();
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// Enable scheduling, and perform a rescheduling operation.
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SchedulerType::EnableScheduling(kernel, cores_needing_scheduling);
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}
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}
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private:
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KernelCore& kernel;
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Common::SpinLock spin_lock{};
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s32 lock_count{};
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EmuThreadHandle owner_thread{EmuThreadHandleInvalid};
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};
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} // namespace Kernel
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