| 7 | #include "task_messages.hpp" |
| 8 | |
| 9 | auto TaskManager::TickUpdate() -> void { |
| 10 | auto& cpu_sched = GetCurrentCpuSched(); |
| 11 | |
| 12 | bool need_preempt = false; |
| 13 | |
| 14 | { |
| 15 | LockGuard<SpinLock> lock_guard(cpu_sched.lock); |
| 16 | |
| 17 | // 递增本核心的 tick 计数 |
| 18 | cpu_sched.local_tick++; |
| 19 | |
| 20 | auto* current = GetCurrentTask(); |
| 21 | |
| 22 | // 唤醒睡眠队列中到时间的任务 |
| 23 | while (!cpu_sched.sleeping_tasks.empty()) { |
| 24 | auto* task = cpu_sched.sleeping_tasks.top(); |
| 25 | |
| 26 | // 检查是否到达唤醒时间 |
| 27 | if (task->sched_info.wake_tick > cpu_sched.local_tick) { |
| 28 | // sleeping_tasks 是一个 priority_queue，只需要检查队首元素 |
| 29 | break; |
| 30 | } |
| 31 | |
| 32 | // 唤醒任务 |
| 33 | cpu_sched.sleeping_tasks.pop(); |
| 34 | task->fsm.Receive(MsgWakeup{}); |
| 35 | |
| 36 | // 将任务重新加入对应调度器的就绪队列 |
| 37 | auto* scheduler = |
| 38 | cpu_sched.schedulers[static_cast<uint8_t>(task->policy)].get(); |
| 39 | if (scheduler) { |
| 40 | scheduler->Enqueue(task); |
| 41 | } |
| 42 | } |
| 43 | |
| 44 | // 更新当前任务的统计信息 |
| 45 | if (current && current->GetStatus() == TaskStatus::kRunning) { |
| 46 | // 更新总运行时间 |
| 47 | current->sched_info.total_runtime++; |
| 48 | |
| 49 | // 减少剩余时间片 |
| 50 | if (current->sched_info.time_slice_remaining > 0) { |
| 51 | current->sched_info.time_slice_remaining--; |
| 52 | } |
| 53 | |
| 54 | // 调用调度器的 OnTick，检查是否需要抢占 |
| 55 | auto* scheduler = |
| 56 | cpu_sched.schedulers[static_cast<uint8_t>(current->policy)].get(); |
| 57 | |
| 58 | if (scheduler) { |
| 59 | // 调度器可能基于自己的策略决定是否抢占 |
| 60 | need_preempt = scheduler->OnTick(current); |
| 61 | } |
| 62 | |
| 63 | // 检查时间片是否耗尽（对于基于时间片的调度器） |
| 64 | if (!need_preempt && current->sched_info.time_slice_remaining == 0) { |
| 65 | need_preempt = true; |
| 66 | } |