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78 lines
2.4 KiB
C++
78 lines
2.4 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/Devices/PIT.h>
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namespace Kernel {
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struct Timer {
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u64 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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enum TimeUnit {
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MS = TICKS_PER_SECOND / 1000,
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S = TICKS_PER_SECOND,
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M = TICKS_PER_SECOND * 60
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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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u64 add_timer(NonnullOwnPtr<Timer>&&);
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u64 add_timer(u64 duration, TimeUnit, Function<void()>&& callback);
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bool cancel_timer(u64 id);
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void fire();
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private:
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void update_next_timer_due();
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u64 m_next_timer_due { 0 };
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u64 m_timer_id_count { 0 };
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SinglyLinkedList<NonnullOwnPtr<Timer>> m_timer_queue;
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};
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}
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