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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/InlineLinkedList.h>
#include <AK/NonnullRefPtr.h>
#include <AK/OwnPtr.h>
#include <AK/RefCounted.h>
#include <AK/Time.h>
#include <Kernel/Time/TimeManagement.h>
namespace Kernel {
TYPEDEF_DISTINCT_ORDERED_ID(u64, TimerId);
class Timer : public RefCounted<Timer>
, public InlineLinkedListNode<Timer> {
friend class TimerQueue;
friend class InlineLinkedListNode<Timer>;
public:
Timer(clockid_t clock_id, Time expires, Function<void()>&& callback)
: m_clock_id(clock_id)
, m_expires(expires)
, m_callback(move(callback))
{
}
~Timer()
{
VERIFY(!is_queued());
}
Time remaining() const;
private:
TimerId m_id;
clockid_t m_clock_id;
Time m_expires;
Time m_remaining {};
Function<void()> m_callback;
Timer* m_next { nullptr };
Timer* m_prev { nullptr };
Atomic<bool, AK::MemoryOrder::memory_order_relaxed> m_queued { false };
bool operator<(const Timer& rhs) const
{
return m_expires < rhs.m_expires;
}
bool operator>(const Timer& rhs) const
{
return m_expires > rhs.m_expires;
}
bool operator==(const Timer& rhs) const
{
return m_id == rhs.m_id;
}
bool is_queued() const { return m_queued; }
void set_queued(bool queued) { m_queued = queued; }
Time now(bool) const;
};
class TimerQueue {
friend class Timer;
public:
TimerQueue();
static TimerQueue& the();
TimerId add_timer(NonnullRefPtr<Timer>&&);
RefPtr<Timer> add_timer_without_id(clockid_t, const Time&, Function<void()>&&);
TimerId add_timer(clockid_t, const Time& timeout, Function<void()>&& callback);
bool cancel_timer(TimerId id);
bool cancel_timer(Timer&);
bool cancel_timer(NonnullRefPtr<Timer>&& timer)
{
return cancel_timer(*move(timer));
}
void fire();
private:
struct Queue {
InlineLinkedList<Timer> list;
Time next_timer_due {};
};
void remove_timer_locked(Queue&, Timer&);
void update_next_timer_due(Queue&);
void add_timer_locked(NonnullRefPtr<Timer>);
Queue& queue_for_timer(Timer& timer)
{
switch (timer.m_clock_id) {
case CLOCK_MONOTONIC:
case CLOCK_MONOTONIC_COARSE:
case CLOCK_MONOTONIC_RAW:
return m_timer_queue_monotonic;
case CLOCK_REALTIME:
case CLOCK_REALTIME_COARSE:
return m_timer_queue_realtime;
default:
VERIFY_NOT_REACHED();
}
}
u64 m_timer_id_count { 0 };
u64 m_ticks_per_second { 0 };
Queue m_timer_queue_monotonic;
Queue m_timer_queue_realtime;
InlineLinkedList<Timer> m_timers_executing;
};
}
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