627 lines
22 KiB
C++
627 lines
22 KiB
C++
/*
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* Copyright (c) 2005 INRIA
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*
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* SPDX-License-Identifier: GPL-2.0-only
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*
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* Author: Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
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*/
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#ifndef SIMULATOR_H
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#define SIMULATOR_H
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#include "event-id.h"
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#include "event-impl.h"
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#include "make-event.h"
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#include "nstime.h"
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#include "object-factory.h"
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#include <stdint.h>
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#include <string>
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/**
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* @file
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* @ingroup simulator
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* ns3::Simulator declaration.
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*/
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namespace ns3
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{
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class SimulatorImpl;
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class Scheduler;
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/**
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* @ingroup core
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* @defgroup simulator Simulator
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* @brief Control the virtual time and the execution of simulation events.
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*/
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/**
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* @ingroup simulator
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*
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* @brief Control the scheduling of simulation events.
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*
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* The internal simulation clock is maintained
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* as a 64-bit integer in a unit specified by the user
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* through the Time::SetResolution function. This means that it is
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* not possible to specify event expiration times with anything better
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* than this user-specified accuracy. Events whose expiration time is
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* the same modulo this accuracy are scheduled in FIFO order: the
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* first event inserted in the scheduling queue is scheduled to
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* expire first.
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*
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* A simple example of how to use the Simulator class to schedule events
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* is shown in sample-simulator.cc:
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* @include src/core/examples/sample-simulator.cc
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*/
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class Simulator
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{
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public:
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// Delete default constructor and destructor to avoid misuse
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Simulator() = delete;
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~Simulator() = delete;
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/**
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* @param [in] impl A new simulator implementation.
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*
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* The simulator provides a mechanism to swap out different implementations.
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* For example, the default implementation is a single-threaded simulator
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* that performs no realtime synchronization. By calling this method, you
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* can substitute in a new simulator implementation that might be multi-
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* threaded and synchronize events to a realtime clock.
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*
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* The simulator implementation can be set when the simulator is not
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* running.
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*/
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static void SetImplementation(Ptr<SimulatorImpl> impl);
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/**
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* @brief Get the SimulatorImpl singleton.
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*
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* @internal
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* If the SimulatorImpl singleton hasn't been created yet,
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* this function does so. At the same time it also creates
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* the Scheduler. Both of these respect the global values
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* which may have been set from the command line or through
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* the Config system.
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*
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* As a side effect we also call LogSetTimePrinter() and
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* LogSetNodePrinter() with the default implementations
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* since we can't really do any logging until we have
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* a SimulatorImpl and Scheduler.
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* @return The SimulatorImpl singleton.
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*/
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static Ptr<SimulatorImpl> GetImplementation();
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/**
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* @brief Set the scheduler type with an ObjectFactory.
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* @param [in] schedulerFactory The configured ObjectFactory.
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*
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* The event scheduler can be set at any time: the events scheduled
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* in the previous scheduler will be transferred to the new scheduler
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* before we start to use it.
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*/
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static void SetScheduler(ObjectFactory schedulerFactory);
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/**
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* Execute the events scheduled with ScheduleDestroy().
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*
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* This method is typically invoked at the end of a simulation
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* to avoid false-positive reports by a leak checker.
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* After this method has been invoked, it is actually possible
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* to restart a new simulation with a set of calls to Simulator::Run,
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* Simulator::Schedule and Simulator::ScheduleWithContext.
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*/
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static void Destroy();
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/**
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* Check if the simulation should finish.
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*
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* Reasons to finish are because there are
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* no more events lefts to be scheduled, or if simulation
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* time has already reached the "stop time" (see Simulator::Stop()).
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*
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* @return @c true if no more events or stop time reached.
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*/
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static bool IsFinished();
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/**
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* Run the simulation.
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*
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* The simulation will run until one of:
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* - No events are present anymore
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* - The user called Simulator::Stop
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* - The user called Simulator::Stop with a stop time and the
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* expiration time of the next event to be processed
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* is greater than or equal to the stop time.
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*/
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static void Run();
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/**
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* Tell the Simulator the calling event should be the last one
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* executed.
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*
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* If a running event invokes this method, it will be the last
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* event executed by the Simulator::Run method before
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* returning to the caller.
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*/
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static void Stop();
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/**
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* Schedule the time delay until the Simulator should stop.
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*
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* Force the Simulator::Run method to return to the caller when the
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* expiration time of the next event to be processed is greater than
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* or equal to the stop time. The stop time is relative to the
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* current simulation time.
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* @param [in] delay The stop time, relative to the current time.
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* @return The stop EventId.
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*/
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static EventId Stop(const Time& delay);
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/**
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* Returns the Stop Event, or an invalid event if the simulation
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* does not have a scheduled stop time.
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* @return The stop EventId.
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*/
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static EventId GetStopEvent();
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/**
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* Get the current simulation context.
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*
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* The simulation context is the ns-3 notion of a Logical Process.
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* Events in a single context should only modify state associated with
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* that context. Events for objects in other contexts should be
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* scheduled with ScheduleWithContext() to track the context switches.
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* In other words, events in different contexts should be mutually
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* thread safe, by not modify overlapping model state.
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*
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* In circumstances where the context can't be determined, such as
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* during object initialization, the \c enum value \c NO_CONTEXT
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* should be used.
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*
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* @return The current simulation context
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*/
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static uint32_t GetContext();
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/**
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* Context enum values.
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*
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* @internal
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* This enum type is fixed to match the representation size
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* of simulation context.
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*/
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enum : uint32_t
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{
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/**
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* Flag for events not associated with any particular context.
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*/
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NO_CONTEXT = 0xffffffff
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};
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/**
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* Get the number of events executed.
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* @returns The total number of events executed.
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*/
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static uint64_t GetEventCount();
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/**
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* @name Schedule events (in the same context) to run at a future time.
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*/
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/** @{ */
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/**
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* Schedule an event to expire after @p delay.
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* This can be thought of as scheduling an event
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* for the current simulation time plus the @p delay passed as a
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* parameter.
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*
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* We leverage SFINAE to discard this overload if the second argument is
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* convertible to Ptr<EventImpl> or is a function pointer.
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*
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* @tparam FUNC @deduced Template type for the function to invoke.
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* @tparam Ts @deduced Argument types.
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* @param [in] delay The relative expiration time of the event.
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* @param [in] f The function to invoke.
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* @param [in] args Arguments to pass to MakeEvent.
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* @returns The id for the scheduled event.
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*/
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template <typename FUNC,
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std::enable_if_t<!std::is_convertible_v<FUNC, Ptr<EventImpl>>, int> = 0,
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std::enable_if_t<!std::is_function_v<std::remove_pointer_t<FUNC>>, int> = 0,
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typename... Ts>
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static EventId Schedule(const Time& delay, FUNC f, Ts&&... args);
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/**
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* Schedule an event to expire after @p delay.
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* This can be thought of as scheduling an event
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* for the current simulation time plus the @p delay passed as a
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* parameter.
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*
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* @tparam Us @deduced Formal function argument types.
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* @tparam Ts @deduced Actual function argument types.
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* When the event expires (when it becomes due to be run), the
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* function will be invoked with any supplied arguments.
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* @param [in] delay The relative expiration time of the event.
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* @param [in] f The function to invoke.
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* @param [in] args Arguments to pass to the invoked function.
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* @returns The id for the scheduled event.
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*/
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template <typename... Us, typename... Ts>
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static EventId Schedule(const Time& delay, void (*f)(Us...), Ts&&... args);
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/** @} */ // Schedule events (in the same context) to run at a future time.
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/**
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* @name Schedule events (in a different context) to run now or at a future time.
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*
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* See @ref main-test-sync.cc for example usage.
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*/
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/** @{ */
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/**
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* Schedule an event with the given context.
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* A context of 0xffffffff means no context is specified.
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* This method is thread-safe: it can be called from any thread.
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*
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* We leverage SFINAE to discard this overload if the second argument is
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* convertible to Ptr<EventImpl> or is a function pointer.
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*
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* @tparam FUNC @deduced Template type for the function to invoke.
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* @tparam Ts @deduced Argument types.
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* @param [in] context User-specified context parameter
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* @param [in] delay The relative expiration time of the event.
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* @param [in] f The function to invoke.
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* @param [in] args Arguments to pass to MakeEvent.
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*/
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template <typename FUNC,
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std::enable_if_t<!std::is_convertible_v<FUNC, Ptr<EventImpl>>, int> = 0,
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std::enable_if_t<!std::is_function_v<std::remove_pointer_t<FUNC>>, int> = 0,
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typename... Ts>
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static void ScheduleWithContext(uint32_t context, const Time& delay, FUNC f, Ts&&... args);
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/**
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* Schedule an event with the given context.
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* A context of 0xffffffff means no context is specified.
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* This method is thread-safe: it can be called from any thread.
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*
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* @tparam Us @deduced Formal function argument types.
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* @tparam Ts @deduced Actual function argument types.
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* @param [in] context User-specified context parameter
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* @param [in] delay The relative expiration time of the event.
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* @param [in] f The function to invoke.
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* @param [in] args Arguments to pass to the invoked function.
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*/
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template <typename... Us, typename... Ts>
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static void ScheduleWithContext(uint32_t context,
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const Time& delay,
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void (*f)(Us...),
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Ts&&... args);
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/** @} */ // Schedule events (in a different context) to run now or at a future time.
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/**
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* @name Schedule events (in the same context) to run now.
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*/
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/** @{ */
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/**
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* Schedule an event to expire Now. All events scheduled to
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* to expire "Now" are scheduled FIFO, after all normal events
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* have expired.
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*
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* We leverage SFINAE to discard this overload if the second argument is
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* convertible to Ptr<EventImpl> or is a function pointer.
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*
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* @tparam FUNC @deduced Template type for the function to invoke.
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* @tparam Ts @deduced Actual function argument types.
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* @param [in] f The function to invoke.
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* @param [in] args Arguments to pass to the invoked function.
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* @return The EventId of the scheduled event.
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*/
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template <typename FUNC,
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std::enable_if_t<!std::is_convertible_v<FUNC, Ptr<EventImpl>>, int> = 0,
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std::enable_if_t<!std::is_function_v<std::remove_pointer_t<FUNC>>, int> = 0,
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typename... Ts>
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static EventId ScheduleNow(FUNC f, Ts&&... args);
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/**
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* Schedule an event to expire Now. All events scheduled to
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* to expire "Now" are scheduled FIFO, after all normal events
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* have expired.
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*
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* @tparam Us @deduced Formal function argument types.
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* @tparam Ts @deduced Actual function argument types.
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* @param [in] f The function to invoke.
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* @param [in] args Arguments to pass to MakeEvent.
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* @return The EventId of the scheduled event.
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*/
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template <typename... Us, typename... Ts>
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static EventId ScheduleNow(void (*f)(Us...), Ts&&... args);
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/** @} */ // Schedule events (in the same context) to run now.
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/**
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* @name Schedule events to run at the end of the simulation, when Simulator:Destroy() is
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* called.
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*/
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/** @{ */
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/**
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* Schedule an event to run at the end of the simulation, when Simulator::Destroy() is called.
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* All events scheduled to expire at "Destroy" time are scheduled FIFO,
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* after all normal events have expired and only when
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* Simulator::Destroy is invoked.
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*
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* We leverage SFINAE to discard this overload if the second argument is
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* convertible to Ptr<EventImpl> or is a function pointer.
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*
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* @tparam FUNC @deduced Template type for the function to invoke.
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* @tparam Ts @deduced Actual function argument types.
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* @param [in] f The function to invoke.
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* @param [in] args Arguments to pass to MakeEvent.
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* @return The EventId of the scheduled event.
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*/
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template <typename FUNC,
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std::enable_if_t<!std::is_convertible_v<FUNC, Ptr<EventImpl>>, int> = 0,
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std::enable_if_t<!std::is_function_v<std::remove_pointer_t<FUNC>>, int> = 0,
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typename... Ts>
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static EventId ScheduleDestroy(FUNC f, Ts&&... args);
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/**
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* Schedule an event to run at the end of the simulation, when Simulator::Destroy() is called.
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* All events scheduled to expire at "Destroy" time are scheduled FIFO,
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* after all normal events have expired and only when
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* Simulator::Destroy is invoked.
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*
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* @tparam Us @deduced Formal function argument types.
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* @tparam Ts @deduced Actual function argument types.
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* @param [in] f The function to invoke.
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* @param [in] args Arguments to pass to MakeEvent.
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* @return The EventId of the scheduled event.
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*/
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template <typename... Us, typename... Ts>
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static EventId ScheduleDestroy(void (*f)(Us...), Ts&&... args);
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/** @} */ // Schedule events to run when Simulator:Destroy() is called.
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/**
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* Remove an event from the event list.
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*
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* This method has the same visible effect as the
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* ns3::EventId::Cancel method
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* but its algorithmic complexity is much higher: it has often
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* O(log(n)) complexity, sometimes O(n), sometimes worse.
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* Note that it is not possible to remove events which were scheduled
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* for the "destroy" time. Doing so will result in a program error (crash).
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*
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* @param [in] id The event to remove from the list of scheduled events.
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*/
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static void Remove(const EventId& id);
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/**
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* Set the cancel bit on this event: the event's associated function
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* will not be invoked when it expires.
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*
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* This method has the same visible effect as the
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* ns3::Simulator::Remove method but its algorithmic complexity is
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* much lower: it has O(1) complexity.
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* This method has the exact same semantics as ns3::EventId::Cancel.
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* Note that it is not possible to cancel events which were scheduled
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* for the "destroy" time. Doing so will result in a program error (crash).
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*
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* @param [in] id the event to cancel
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*/
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static void Cancel(const EventId& id);
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/**
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* Check if an event has already run or been cancelled.
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*
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* This method has O(1) complexity.
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* Note that it is not possible to test for the expiration of
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* events which were scheduled for the "destroy" time. Doing so
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* will result in a program error (crash).
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* An event is said to "expire" when it starts being executed,
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* which means that if the code executed by the event calls
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* this function, it will get true.
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*
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* @param [in] id The event to test for expiration.
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* @returns @c true if the event has expired, false otherwise.
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*/
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static bool IsExpired(const EventId& id);
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/**
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* Return the current simulation virtual time.
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*
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* @returns The current virtual time.
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*/
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static Time Now();
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/**
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* Get the remaining time until this event will execute.
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*
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* @param [in] id The event id to analyse.
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* @return The delay left until the input event id expires.
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* if the event is not running, this method returns
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* zero.
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*/
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static Time GetDelayLeft(const EventId& id);
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/**
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* Get the maximum representable simulation time.
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*
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* @return The maximum simulation time at which an event
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* can be scheduled.
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*
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* The returned value will always be bigger than or equal to Simulator::Now.
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*/
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static Time GetMaximumSimulationTime();
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/**
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* Schedule a future event execution (in the same context).
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*
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* @param [in] delay Delay until the event expires.
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* @param [in] event The event to schedule.
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* @returns A unique identifier for the newly-scheduled event.
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*/
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static EventId Schedule(const Time& delay, const Ptr<EventImpl>& event);
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/**
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* Schedule a future event execution (in a different context).
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* This method is thread-safe: it can be called from any thread.
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*
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* @param [in] delay Delay until the event expires.
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* @param [in] context Event context.
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* @param [in] event The event to schedule.
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*/
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static void ScheduleWithContext(uint32_t context, const Time& delay, EventImpl* event);
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/**
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* Schedule an event to run at the end of the simulation, after
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* the Stop() time or condition has been reached.
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*
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* @param [in] event The event to schedule.
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* @returns A unique identifier for the newly-scheduled event.
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*/
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static EventId ScheduleDestroy(const Ptr<EventImpl>& event);
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/**
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* Schedule an event to run at the current virtual time.
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*
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* @param [in] event The event to schedule.
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* @returns A unique identifier for the newly-scheduled event.
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*/
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static EventId ScheduleNow(const Ptr<EventImpl>& event);
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/**
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* Get the system id of this simulator.
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*
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* The system id is the identifier for this simulator instance
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* in a distributed simulation. For MPI this is the MPI rank.
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* @return The system id for this simulator.
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*/
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static uint32_t GetSystemId();
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private:
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/**
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* Implementation of the various Schedule methods.
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* @param [in] delay Delay until the event should execute.
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* @param [in] event The event to execute.
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* @return The EventId.
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*/
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static EventId DoSchedule(const Time& delay, EventImpl* event);
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/**
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* Implementation of the various ScheduleNow methods.
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* @param [in] event The event to execute.
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* @return The EventId.
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*/
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static EventId DoScheduleNow(EventImpl* event);
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/**
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* Implementation of the various ScheduleDestroy methods.
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* @param [in] event The event to execute.
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|
* @return The EventId.
|
|
*/
|
|
static EventId DoScheduleDestroy(EventImpl* event);
|
|
|
|
/**
|
|
* Stop event (if present)
|
|
*/
|
|
static EventId m_stopEvent;
|
|
|
|
// end of class Simulator
|
|
};
|
|
|
|
/**
|
|
* @ingroup simulator
|
|
* @brief create an ns3::Time instance which contains the
|
|
* current simulation time.
|
|
*
|
|
* This is really a shortcut for the ns3::Simulator::Now method.
|
|
* It is typically used as shown below to schedule an event
|
|
* which expires at the absolute time "2 seconds":
|
|
* @code
|
|
* Simulator::Schedule (Seconds (2.0) - Now (), &my_function);
|
|
* @endcode
|
|
* @return The current simulation time.
|
|
*/
|
|
Time Now();
|
|
|
|
} // namespace ns3
|
|
|
|
/********************************************************************
|
|
* Implementation of the templates declared above.
|
|
********************************************************************/
|
|
|
|
namespace ns3
|
|
{
|
|
|
|
// Doxygen has trouble with static template functions in a class:
|
|
// it treats the in-class declaration as different from the
|
|
// out of class definition, so makes two entries in the member list. Ugh
|
|
|
|
template <typename FUNC,
|
|
std::enable_if_t<!std::is_convertible_v<FUNC, Ptr<EventImpl>>, int>,
|
|
std::enable_if_t<!std::is_function_v<std::remove_pointer_t<FUNC>>, int>,
|
|
typename... Ts>
|
|
EventId
|
|
Simulator::Schedule(const Time& delay, FUNC f, Ts&&... args)
|
|
{
|
|
return DoSchedule(delay, MakeEvent(f, std::forward<Ts>(args)...));
|
|
}
|
|
|
|
template <typename... Us, typename... Ts>
|
|
EventId
|
|
Simulator::Schedule(const Time& delay, void (*f)(Us...), Ts&&... args)
|
|
{
|
|
return DoSchedule(delay, MakeEvent(f, std::forward<Ts>(args)...));
|
|
}
|
|
|
|
template <typename FUNC,
|
|
std::enable_if_t<!std::is_convertible_v<FUNC, Ptr<EventImpl>>, int>,
|
|
std::enable_if_t<!std::is_function_v<std::remove_pointer_t<FUNC>>, int>,
|
|
typename... Ts>
|
|
void
|
|
Simulator::ScheduleWithContext(uint32_t context, const Time& delay, FUNC f, Ts&&... args)
|
|
{
|
|
return ScheduleWithContext(context, delay, MakeEvent(f, std::forward<Ts>(args)...));
|
|
}
|
|
|
|
template <typename... Us, typename... Ts>
|
|
void
|
|
Simulator::ScheduleWithContext(uint32_t context, const Time& delay, void (*f)(Us...), Ts&&... args)
|
|
{
|
|
return ScheduleWithContext(context, delay, MakeEvent(f, std::forward<Ts>(args)...));
|
|
}
|
|
|
|
template <typename FUNC,
|
|
std::enable_if_t<!std::is_convertible_v<FUNC, Ptr<EventImpl>>, int>,
|
|
std::enable_if_t<!std::is_function_v<std::remove_pointer_t<FUNC>>, int>,
|
|
typename... Ts>
|
|
EventId
|
|
Simulator::ScheduleNow(FUNC f, Ts&&... args)
|
|
{
|
|
return DoScheduleNow(MakeEvent(f, std::forward<Ts>(args)...));
|
|
}
|
|
|
|
template <typename... Us, typename... Ts>
|
|
EventId
|
|
Simulator::ScheduleNow(void (*f)(Us...), Ts&&... args)
|
|
{
|
|
return DoScheduleNow(MakeEvent(f, std::forward<Ts>(args)...));
|
|
}
|
|
|
|
template <typename FUNC,
|
|
std::enable_if_t<!std::is_convertible_v<FUNC, Ptr<EventImpl>>, int>,
|
|
std::enable_if_t<!std::is_function_v<std::remove_pointer_t<FUNC>>, int>,
|
|
typename... Ts>
|
|
EventId
|
|
Simulator::ScheduleDestroy(FUNC f, Ts&&... args)
|
|
{
|
|
return DoScheduleDestroy(MakeEvent(f, std::forward<Ts>(args)...));
|
|
}
|
|
|
|
template <typename... Us, typename... Ts>
|
|
EventId
|
|
Simulator::ScheduleDestroy(void (*f)(Us...), Ts&&... args)
|
|
{
|
|
return DoScheduleDestroy(MakeEvent(f, std::forward<Ts>(args)...));
|
|
}
|
|
|
|
} // namespace ns3
|
|
|
|
#endif /* SIMULATOR_H */
|