A Discrete-Event Network Simulator
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watchdog.h
Go to the documentation of this file.
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/*
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* Copyright (c) 2007 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 WATCHDOG_H
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#define WATCHDOG_H
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#include "
event-id.h
"
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#include "
nstime.h
"
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/**
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* \file
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* \ingroup timer
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* ns3::Watchdog timer class declaration.
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*/
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namespace
ns3
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{
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namespace
internal
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{
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class
TimerImpl;
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}
// namespace internal
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/**
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* \ingroup timer
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* \brief A very simple watchdog operating in virtual time.
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*
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* The watchdog timer is started by calling Ping with a delay value.
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* Once started the timer cannot be suspended, cancelled or shortened.
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* It _can_ be lengthened (delayed) by calling Ping again: if the new
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* expire time (current simulation time plus the new delay)
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* is greater than the old expire time the timer will be extended
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* to the new expire time.
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*
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* Typical usage would be to periodically Ping the Watchdog, extending
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* it's execution time. If the owning process fails to Ping before
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* the Watchdog expires, the registered function will be invoked.
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*
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* If you don't ping the watchdog sufficiently often, it triggers its
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* listening function.
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*
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* \see Timer for a more sophisticated general purpose timer.
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*/
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class
Watchdog
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{
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public
:
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/** Constructor. */
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Watchdog
();
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/** Destructor. */
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~Watchdog
();
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/**
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* Delay the timer.
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*
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* \param [in] delay The watchdog delay
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*
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* After a call to this method, the watchdog will not be triggered
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* until the delay specified has been expired. This operation is
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* sometimes named "re-arming" a watchdog in some operating systems.
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*/
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void
Ping
(
Time
delay);
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/**
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* Set the function to execute when the timer expires.
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*
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* \tparam FN \deduced The type of the function.
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* \param [in] fn The function
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*
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* Store this function in this Timer for later use by Timer::Schedule.
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*/
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template
<
typename
FN>
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void
SetFunction
(FN fn);
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/**
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* Set the function to execute when the timer expires.
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*
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* \tparam MEM_PTR \deduced Class method function type.
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* \tparam OBJ_PTR \deduced Class type containing the function.
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* \param [in] memPtr The member function pointer
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* \param [in] objPtr The pointer to object
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*
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* Store this function and object in this Timer for later use by Timer::Schedule.
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*/
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template
<
typename
MEM_PTR,
typename
OBJ_PTR>
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void
SetFunction
(MEM_PTR memPtr, OBJ_PTR objPtr);
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/**
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* Set the arguments to be used when invoking the expire function.
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*/
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/**@{*/
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/**
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* \tparam Ts \deduced Argument types.
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* \param [in] args arguments
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*/
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template
<
typename
... Ts>
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void
SetArguments
(Ts&&... args);
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/**@}*/
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private
:
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/** Internal callback invoked when the timer expires. */
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void
Expire
();
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/**
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* The timer implementation, which contains the bound callback
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* function and arguments.
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*/
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internal::TimerImpl
*
m_impl
;
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/** The future event scheduled to expire the timer. */
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EventId
m_event
;
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/** The absolute time when the timer will expire. */
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Time
m_end
;
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};
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}
// namespace ns3
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/********************************************************************
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* Implementation of the templates declared above.
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********************************************************************/
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#include "
timer-impl.h
"
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namespace
ns3
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{
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template
<
typename
FN>
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void
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Watchdog::SetFunction
(FN fn)
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{
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delete
m_impl
;
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m_impl
=
internal::MakeTimerImpl
(fn);
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}
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template
<
typename
MEM_PTR,
typename
OBJ_PTR>
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void
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Watchdog::SetFunction
(MEM_PTR memPtr, OBJ_PTR objPtr)
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{
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delete
m_impl
;
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m_impl
=
internal::MakeTimerImpl
(memPtr, objPtr);
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}
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template
<
typename
... Ts>
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void
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Watchdog::SetArguments
(Ts&&... args)
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{
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if
(
m_impl
==
nullptr
)
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{
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NS_FATAL_ERROR
(
"You cannot set the arguments of a Watchdog before setting its function."
);
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return
;
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}
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m_impl
->
SetArgs
(std::forward<Ts>(args)...);
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}
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}
// namespace ns3
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#endif
/* WATCHDOG_H */
ns3::EventId
An identifier for simulation events.
Definition
event-id.h:45
ns3::Time
Simulation virtual time values and global simulation resolution.
Definition
nstime.h:94
ns3::Watchdog
A very simple watchdog operating in virtual time.
Definition
watchdog.h:51
ns3::Watchdog::m_impl
internal::TimerImpl * m_impl
The timer implementation, which contains the bound callback function and arguments.
Definition
watchdog.h:112
ns3::Watchdog::Expire
void Expire()
Internal callback invoked when the timer expires.
Definition
watchdog.cc:52
ns3::Watchdog::SetArguments
void SetArguments(Ts &&... args)
Set the arguments to be used when invoking the expire function.
Definition
watchdog.h:148
ns3::Watchdog::m_event
EventId m_event
The future event scheduled to expire the timer.
Definition
watchdog.h:114
ns3::Watchdog::~Watchdog
~Watchdog()
Destructor.
Definition
watchdog.cc:31
ns3::Watchdog::Watchdog
Watchdog()
Constructor.
Definition
watchdog.cc:23
ns3::Watchdog::Ping
void Ping(Time delay)
Delay the timer.
Definition
watchdog.cc:39
ns3::Watchdog::SetFunction
void SetFunction(FN fn)
Set the function to execute when the timer expires.
Definition
watchdog.h:132
ns3::Watchdog::m_end
Time m_end
The absolute time when the timer will expire.
Definition
watchdog.h:116
ns3::internal::TimerImpl
The timer implementation underlying Timer and Watchdog.
Definition
timer-impl.h:35
ns3::internal::TimerImpl::SetArgs
void SetArgs(Args... args)
Set the arguments to be used when invoking the expire function.
Definition
timer-impl.h:182
event-id.h
ns3::EventId declarations.
NS_FATAL_ERROR
#define NS_FATAL_ERROR(msg)
Report a fatal error with a message and terminate.
Definition
fatal-error.h:168
ns3::internal::MakeTimerImpl
TimerImpl * MakeTimerImpl(U(fn)(Ts...))
Make a TimerImpl from a function pointer taking varying numbers of arguments.
Definition
timer-impl.h:92
ns3
Every class exported by the ns3 library is enclosed in the ns3 namespace.
nstime.h
Declaration of classes ns3::Time and ns3::TimeWithUnit, and the TimeValue implementation classes.
timer-impl.h
ns3::TimerImpl declaration and implementation.
src
core
model
watchdog.h
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