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eeb5318c25
The public consumers of the timer API shouldn't need to know the how timer id's are tracked internally. Expose a typedef instead to allow the internal implementation to be protected from potential churn in the future. It's also just good API design.
81 lines
2.5 KiB
C++
81 lines
2.5 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/NonnullOwnPtr.h>
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#include <AK/OwnPtr.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 {
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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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};
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class TimerQueue {
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public:
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static TimerQueue& the();
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TimerId add_timer(NonnullOwnPtr<Timer>&&);
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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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void fire();
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private:
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TimerQueue();
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void update_next_timer_due();
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u64 microseconds_to_ticks(u64 micro_seconds) { return micro_seconds * (m_ticks_per_second / 1'000'000); }
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u64 seconds_to_ticks(u64 seconds) { return seconds * m_ticks_per_second; }
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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<NonnullOwnPtr<Timer>> m_timer_queue;
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};
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}
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