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d9fb93c5ce
It's possible that a timer may have been queued to be executed by the timer irq handler, but if we're in a critical section on the same processor and are trying to cancel that timer, we would spin forever waiting for it to be executed.
124 lines
3.2 KiB
C++
124 lines
3.2 KiB
C++
/*
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* Copyright (c) 2018-2020, 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/Function.h>
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#include <AK/IntrusiveList.h>
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#include <AK/NonnullRefPtr.h>
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#include <AK/OwnPtr.h>
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#include <AK/RefCounted.h>
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#include <AK/Time.h>
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#include <Kernel/Time/TimeManagement.h>
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namespace Kernel {
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TYPEDEF_DISTINCT_ORDERED_ID(u64, TimerId);
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class Timer : public RefCounted<Timer> {
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friend class TimerQueue;
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public:
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void setup(clockid_t clock_id, Time expires, Function<void()>&& callback)
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{
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VERIFY(!is_queued());
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m_clock_id = clock_id;
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m_expires = expires;
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m_callback = move(callback);
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}
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~Timer()
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{
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VERIFY(!is_queued());
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}
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Time remaining() const;
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private:
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TimerId m_id;
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clockid_t m_clock_id;
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Time m_expires;
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Time m_remaining {};
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Function<void()> m_callback;
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Atomic<bool> m_cancelled { false };
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Atomic<bool> m_callback_finished { false };
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bool operator<(const Timer& rhs) const
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{
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return m_expires < rhs.m_expires;
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}
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bool operator>(const Timer& rhs) const
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{
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return m_expires > rhs.m_expires;
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}
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bool operator==(const Timer& rhs) const
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{
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return m_id == rhs.m_id;
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}
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void clear_cancelled() { return m_cancelled.store(false, AK::memory_order_release); }
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bool set_cancelled() { return m_cancelled.exchange(true, AK::memory_order_acq_rel); }
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bool is_callback_finished() const { return m_callback_finished.load(AK::memory_order_acquire); }
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void clear_callback_finished() { m_callback_finished.store(false, AK::memory_order_release); }
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void set_callback_finished() { m_callback_finished.store(true, AK::memory_order_release); }
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Time now(bool) const;
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bool is_queued() const { return m_list_node.is_in_list(); }
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public:
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IntrusiveListNode<Timer> m_list_node;
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using List = IntrusiveList<Timer, RawPtr<Timer>, &Timer::m_list_node>;
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};
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class TimerQueue {
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friend class Timer;
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public:
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TimerQueue();
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static TimerQueue& the();
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TimerId add_timer(NonnullRefPtr<Timer>&&);
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bool add_timer_without_id(NonnullRefPtr<Timer>, clockid_t, const Time&, Function<void()>&&);
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TimerId add_timer(clockid_t, const Time& timeout, Function<void()>&& callback);
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bool cancel_timer(TimerId id);
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bool cancel_timer(Timer&);
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bool cancel_timer(NonnullRefPtr<Timer>&& timer)
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{
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return cancel_timer(*move(timer));
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}
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void fire();
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private:
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struct Queue {
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Timer::List list;
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Time next_timer_due {};
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};
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void remove_timer_locked(Queue&, Timer&);
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void update_next_timer_due(Queue&);
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void add_timer_locked(NonnullRefPtr<Timer>);
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Queue& queue_for_timer(Timer& timer)
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{
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switch (timer.m_clock_id) {
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case CLOCK_MONOTONIC:
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case CLOCK_MONOTONIC_COARSE:
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case CLOCK_MONOTONIC_RAW:
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return m_timer_queue_monotonic;
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case CLOCK_REALTIME:
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case CLOCK_REALTIME_COARSE:
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return m_timer_queue_realtime;
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default:
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VERIFY_NOT_REACHED();
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}
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}
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u64 m_timer_id_count { 0 };
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u64 m_ticks_per_second { 0 };
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Queue m_timer_queue_monotonic;
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Queue m_timer_queue_realtime;
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Timer::List m_timers_executing;
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};
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}
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