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// SPDX-FileCopyrightText: Copyright 2022 yuzu Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#pragma once
#include "core/hle/kernel/k_spin_lock.h"
#include "core/hle/kernel/k_thread.h"
#include "core/hle/kernel/k_timer_task.h"
namespace Kernel {
class KHardwareTimerBase {
public:
explicit KHardwareTimerBase(KernelCore& kernel) : m_kernel{kernel} {}
void CancelTask(KTimerTask* task) {
KScopedDisableDispatch dd{m_kernel};
KScopedSpinLock lk{m_lock};
if (const s64 task_time = task->GetTime(); task_time > 0) {
this->RemoveTaskFromTree(task);
}
}
protected:
KSpinLock& GetLock() {
return m_lock;
}
s64 DoInterruptTaskImpl(s64 cur_time) {
// We want to handle all tasks, returning the next time that a task is scheduled.
while (true) {
// Get the next task. If there isn't one, return 0.
KTimerTask* task = m_next_task;
if (task == nullptr) {
return 0;
}
// If the task needs to be done in the future, do it in the future and not now.
if (const s64 task_time = task->GetTime(); task_time > cur_time) {
return task_time;
}
// Remove the task from the tree of tasks, and update our next task.
this->RemoveTaskFromTree(task);
// Handle the task.
task->OnTimer();
}
}
bool RegisterAbsoluteTaskImpl(KTimerTask* task, s64 task_time) {
ASSERT(task_time > 0);
// Set the task's time, and insert it into our tree.
task->SetTime(task_time);
m_task_tree.insert(*task);
// Update our next task if relevant.
if (m_next_task != nullptr && m_next_task->GetTime() <= task_time) {
return false;
}
m_next_task = task;
return true;
}
private:
void RemoveTaskFromTree(KTimerTask* task) {
// Erase from the tree.
auto it = m_task_tree.erase(m_task_tree.iterator_to(*task));
// Clear the task's scheduled time.
task->SetTime(0);
// Update our next task if relevant.
if (m_next_task == task) {
m_next_task = (it != m_task_tree.end()) ? std::addressof(*it) : nullptr;
}
}
protected:
KernelCore& m_kernel;
private:
using TimerTaskTree = Common::IntrusiveRedBlackTreeBaseTraits<KTimerTask>::TreeType<KTimerTask>;
KSpinLock m_lock{};
TimerTaskTree m_task_tree{};
KTimerTask* m_next_task{};
};
} // namespace Kernel
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