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308 lines
7.6 KiB
C++
308 lines
7.6 KiB
C++
/*
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* \brief Multiplexing one time source amongst different timeouts
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* \author Martin Stein
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* \date 2016-11-04
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*
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* These classes are not meant to be used directly. They merely exist to share
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* the generic parts of timeout-scheduling between the Timer::Connection and the
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* Timer driver. For user-level timeout-scheduling you should use the interface
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* in timer_session/connection.h instead.
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*/
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/*
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* Copyright (C) 2016-2017 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU Affero General Public License version 3.
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*/
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#ifndef _TIMER__TIMEOUT_H_
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#define _TIMER__TIMEOUT_H_
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/* Genode includes */
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#include <util/noncopyable.h>
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#include <base/duration.h>
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#include <base/log.h>
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#include <base/mutex.h>
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namespace Genode {
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class Time_source;
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class Timeout_scheduler;
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class Timeout;
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class Alarm_timeout_scheduler;
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}
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namespace Timer
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{
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class Connection;
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class Root_component;
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}
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/**
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* Interface of a time source that can handle one timeout at a time
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*/
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struct Genode::Time_source : Interface
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{
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/**
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* Interface of a timeout callback
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*/
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struct Timeout_handler : Interface
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{
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virtual void handle_timeout(Duration curr_time) = 0;
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};
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/**
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* Return the current time of the source
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*/
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virtual Duration curr_time() = 0;
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/**
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* Return the maximum timeout duration that the source can handle
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*/
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virtual Microseconds max_timeout() const = 0;
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/**
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* Install a timeout, overrides the last timeout if any
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*
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* \param duration timeout duration
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* \param handler timeout callback
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*/
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virtual void schedule_timeout(Microseconds duration,
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Timeout_handler &handler) = 0;
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/**
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* Tell the time source which scheduler to use for its own timeouts
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*
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* This method enables a time source for example to synchronize with an
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* accurate but expensive timer only on a periodic basis while using a
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* cheaper interpolation in general.
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*/
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virtual void scheduler(Timeout_scheduler &) { };
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};
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/**
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* Interface of a time-source multiplexer
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*
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* Beside 'curr_time()', this abstract interface is used by the Timeout
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* implementation only. Users of the timeout framework must schedule and
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* discard timeouts via methods of the timeout.
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*/
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class Genode::Timeout_scheduler : Interface
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{
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private:
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friend Timeout;
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/**
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* Add a one-shot timeout to the schedule
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*
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* \param timeout timeout callback object
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* \param duration timeout trigger delay
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*/
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virtual void _schedule_one_shot(Timeout &timeout, Microseconds duration) = 0;
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/**
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* Add a periodic timeout to the schedule
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*
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* \param timeout timeout callback object
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* \param duration timeout trigger period
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*/
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virtual void _schedule_periodic(Timeout &timeout, Microseconds duration) = 0;
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/**
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* Remove timeout from the scheduler
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*
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* \param timeout corresponding timeout callback object
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*/
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virtual void _discard(Timeout &timeout) = 0;
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public:
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/**
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* Read out the now time of the scheduler
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*/
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virtual Duration curr_time() = 0;
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};
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/**
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* Timeout callback that can be used for both one-shot and periodic timeouts
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*
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* This class should be used only if it is necessary to use one timeout
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* callback for both periodic and one-shot timeouts. This is the case, for
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* example, in a Timer-session server. If this is not the case, the classes
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* Periodic_timeout and One_shot_timeout are the better choice.
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*/
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class Genode::Timeout : private Noncopyable
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{
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friend class Alarm_timeout_scheduler;
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public:
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/**
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* Interface of a timeout handler
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*/
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struct Handler : Interface
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{
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virtual void handle_timeout(Duration curr_time) = 0;
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};
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private:
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class Alarm
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{
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friend class Alarm_timeout_scheduler;
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private:
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typedef uint64_t Time;
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struct Raw
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{
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Time deadline;
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bool deadline_period;
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Time period;
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bool is_pending_at(uint64_t time, bool time_period) const;
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};
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Mutex _dispatch_mutex { };
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Raw _raw { };
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int _active { 0 };
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Alarm *_next { nullptr };
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Alarm_timeout_scheduler *_scheduler { nullptr };
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void _alarm_assign(Time period,
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Time deadline,
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bool deadline_period,
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Alarm_timeout_scheduler *scheduler)
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{
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_raw.period = period;
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_raw.deadline_period = deadline_period;
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_raw.deadline = deadline;
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_scheduler = scheduler;
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}
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void _alarm_reset() { _alarm_assign(0, 0, false, 0), _active = 0, _next = 0; }
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bool _on_alarm(uint64_t);
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Alarm(Alarm const &);
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Alarm &operator = (Alarm const &);
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public:
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Timeout_scheduler &timeout_scheduler;
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Handler *handler = nullptr;
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bool periodic = false;
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Alarm(Timeout_scheduler &timeout_scheduler)
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: timeout_scheduler(timeout_scheduler) { _alarm_reset(); }
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virtual ~Alarm();
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} _alarm;
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public:
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Timeout(Timeout_scheduler &timeout_scheduler)
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: _alarm(timeout_scheduler) { }
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~Timeout() { discard(); }
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void schedule_periodic(Microseconds duration, Handler &handler);
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void schedule_one_shot(Microseconds duration, Handler &handler);
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void discard();
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bool scheduled() { return _alarm.handler != nullptr; }
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};
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/**
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* Timeout-scheduler implementation using the Alarm framework
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*/
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class Genode::Alarm_timeout_scheduler : private Noncopyable,
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public Timeout_scheduler,
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public Time_source::Timeout_handler
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{
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friend class Timer::Connection;
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friend class Timer::Root_component;
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friend class Timeout::Alarm;
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private:
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using Alarm = Timeout::Alarm;
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Time_source &_time_source;
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Mutex _mutex { };
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Alarm *_active_head { nullptr };
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Alarm *_pending_head { nullptr };
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Alarm::Time _now { 0UL };
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bool _now_period { false };
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Alarm::Raw _min_handle_period { };
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void _alarm_unsynchronized_enqueue(Alarm *alarm);
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void _alarm_unsynchronized_dequeue(Alarm *alarm);
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Alarm *_alarm_get_pending_alarm();
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void _alarm_setup_alarm(Alarm &alarm, Alarm::Time period, Alarm::Time first_duration);
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void _enable();
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/**********************************
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** Time_source::Timeout_handler **
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**********************************/
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void handle_timeout(Duration curr_time) override;
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/***********************
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** Timeout_scheduler **
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***********************/
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void _schedule_one_shot(Timeout &timeout, Microseconds duration) override;
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void _schedule_periodic(Timeout &timeout, Microseconds duration) override;
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void _discard(Timeout &timeout) override {
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_alarm_discard(&timeout._alarm); }
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void _alarm_discard(Alarm *alarm);
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void _alarm_schedule_absolute(Alarm *alarm, Alarm::Time duration);
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void _alarm_schedule(Alarm *alarm, Alarm::Time period);
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void _alarm_handle(Alarm::Time now);
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bool _alarm_next_deadline(Alarm::Time *deadline);
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bool _alarm_head_timeout(const Alarm * alarm) { return _active_head == alarm; }
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Alarm_timeout_scheduler(Alarm_timeout_scheduler const &);
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Alarm_timeout_scheduler &operator = (Alarm_timeout_scheduler const &);
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public:
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Alarm_timeout_scheduler(Time_source &time_source,
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Microseconds min_handle_period = Microseconds(1));
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~Alarm_timeout_scheduler();
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/***********************
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** Timeout_scheduler **
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***********************/
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Duration curr_time() override { return _time_source.curr_time(); }
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};
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#endif /* _TIMER__TIMEOUT_H_ */
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