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https://github.com/RGBCube/serenity
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6cb640eeba
Use the TimerQueue to expire blocking operations, which is one less thing the Scheduler needs to check on every iteration. Also, add a BlockTimeout class that will automatically handle relative or absolute timeouts as well as overriding timeouts (e.g. socket timeouts) more consistently. Also, rework the TimerQueue class to be able to fire events from any processor, which requires Timer to be RefCounted. Also allow creating id-less timers for use by blocking operations.
89 lines
2.8 KiB
C++
89 lines
2.8 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/NonnullRefPtr.h>
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#include <AK/OwnPtr.h>
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#include <AK/RefCounted.h>
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#include <AK/SinglyLinkedList.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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struct Timer : public RefCounted<Timer> {
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TimerId id;
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u64 expires;
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Function<void()> callback;
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bool operator<(const Timer& rhs) const
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{
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return expires < rhs.expires;
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}
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bool operator>(const Timer& rhs) const
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{
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return expires > rhs.expires;
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}
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bool operator==(const Timer& rhs) const
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{
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return id == rhs.id;
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}
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Timer(u64 expires, Function<void()>&& callback)
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: expires(expires)
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, callback(move(callback))
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{
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}
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};
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class TimerQueue {
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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(const NonnullRefPtr<Timer>&);
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void fire();
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private:
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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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SinglyLinkedList<NonnullRefPtr<Timer>> m_timer_queue;
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};
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}
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