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601a688b6f
We need to be able to guarantee that a timer won't be executing after TimerQueue::cancel_timer returns. In the case of multiple processors this means that we may need to wait while the timer handler finishes execution on another core. This also fixes a problem in Thread::block and Thread::wait_on where theoretically the timer could execute after the function returned and the Thread disappeared.
113 lines
3.5 KiB
C++
113 lines
3.5 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <AK/Function.h>
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#include <AK/InlineLinkedList.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 <Kernel/Time/TimeManagement.h>
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namespace Kernel {
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typedef u64 TimerId;
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class Timer : public RefCounted<Timer>
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, public InlineLinkedListNode<Timer> {
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friend class TimerQueue;
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friend class InlineLinkedListNode<Timer>;
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public:
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Timer(u64 expires, Function<void()>&& callback)
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: m_expires(expires)
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, m_callback(move(callback))
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{
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}
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~Timer()
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{
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ASSERT(!is_queued());
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}
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private:
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TimerId m_id;
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u64 m_expires;
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Function<void()> m_callback;
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Timer* m_next { nullptr };
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Timer* m_prev { nullptr };
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Atomic<bool> m_queued { 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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bool is_queued() const { return m_queued.load(AK::MemoryOrder::memory_order_relaxed); }
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void set_queued(bool queued) { m_queued.store(queued, AK::MemoryOrder::memory_order_relaxed); }
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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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RefPtr<Timer> add_timer_without_id(const timespec& timeout, Function<void()>&& callback);
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TimerId add_timer(timeval& timeout, Function<void()>&& callback);
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bool cancel_timer(TimerId id);
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bool cancel_timer(NonnullRefPtr<Timer>&& timer)
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{
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return cancel_timer(timer.leak_ref());
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}
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void fire();
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private:
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bool cancel_timer(Timer&);
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void update_next_timer_due();
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void add_timer_locked(NonnullRefPtr<Timer>);
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timespec ticks_to_time(u64 ticks) const;
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u64 time_to_ticks(const timespec&) const;
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u64 m_next_timer_due { 0 };
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u64 m_timer_id_count { 0 };
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u64 m_ticks_per_second { 0 };
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InlineLinkedList<Timer> m_timer_queue;
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InlineLinkedList<Timer> m_timers_executing;
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};
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}
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