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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include <AK/Function.h>
#include <AK/NonnullOwnPtr.h>
#include <AK/OwnPtr.h>
#include <AK/SinglyLinkedList.h>
#include <Kernel/Time/TimeManagement.h>
namespace Kernel {
typedef u64 TimerId;
struct Timer {
TimerId id;
u64 expires;
Function<void()> callback;
bool operator<(const Timer& rhs) const
{
return expires < rhs.expires;
}
bool operator>(const Timer& rhs) const
{
return expires > rhs.expires;
}
bool operator==(const Timer& rhs) const
{
return id == rhs.id;
}
};
class TimerQueue {
public:
TimerQueue();
static TimerQueue& the();
TimerId add_timer(NonnullOwnPtr<Timer>&&);
TimerId add_timer(timeval& timeout, Function<void()>&& callback);
bool cancel_timer(TimerId id);
void fire();
private:
void update_next_timer_due();
u64 microseconds_to_ticks(u64 micro_seconds) { return micro_seconds * (m_ticks_per_second / 1'000'000); }
u64 seconds_to_ticks(u64 seconds) { return seconds * m_ticks_per_second; }
u64 m_next_timer_due { 0 };
u64 m_timer_id_count { 0 };
u64 m_ticks_per_second { 0 };
SinglyLinkedList<NonnullOwnPtr<Timer>> m_timer_queue;
};
}
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