A simple virtual Timer class. More...

#include "timer.h"

Collaboration diagram for ns3::Timer:

Public Types
enum	DestroyPolicy { CANCEL_ON_DESTROY = (1 << 3) , REMOVE_ON_DESTROY = (1 << 4) , CHECK_ON_DESTROY = (1 << 5) }
	The policy to use to manager the internal timer when an instance of the Timer class is destroyed or suspended. More...

enum	State { RUNNING , EXPIRED , SUSPENDED }
	The possible states of the Timer. More...

Public Member Functions
	Timer ()
	Create a timer with a default event lifetime management policy:

	Timer (DestroyPolicy destroyPolicy)

	~Timer ()

void	Cancel ()
	Cancel the currently-running event if there is one.

Time	GetDelay () const

Time	GetDelayLeft () const

Timer::State	GetState () const

bool	IsExpired () const

bool	IsRunning () const

bool	IsSuspended () const

void	Remove ()
	Remove from the simulation event-list the currently-running event if there is one.

void	Resume ()
	Restart the timer to expire within the amount of time left saved during Suspend.

void	Schedule ()
	Schedule a new event using the currently-configured delay, function, and arguments.

void	Schedule (Time delay)

template<typename... Ts>
void	SetArguments (Ts... args)

void	SetDelay (const Time &delay)

template<typename FN >
void	SetFunction (FN fn)

template<typename MEM_PTR , typename OBJ_PTR >
void	SetFunction (MEM_PTR memPtr, OBJ_PTR objPtr)

void	Suspend ()
	Pause the timer and save the amount of time left until it was set to expire.

Private Attributes
Time	m_delay
	The delay configured for this Timer.

Time	m_delayLeft
	The amount of time left on the Timer while it is suspended.

EventId	m_event
	The future event scheduled to expire the timer.

int	m_flags
	Bitfield for Timer State, DestroyPolicy and InternalSuspended.

internal::TimerImpl *	m_impl
	The timer implementation, which contains the bound callback function and arguments.

Static Private Attributes
static constexpr auto	TIMER_SUSPENDED {1 << 7}
	Internal bit marking the suspended timer state.

Detailed Description

A simple virtual Timer class.

A (virtual time) timer is used to hold together a delay, a function to invoke when the delay expires, and a set of arguments to pass to the function when the delay expires.

A Timer can be suspended, resumed, cancelled and queried for the time left, but it can't be extended (except by suspending and resuming).

A timer can also be used to enforce a set of predefined event lifetime management policies. These policies are specified at construction time and cannot be changed after.

See also: Watchdog for a simpler interface for a watchdog Virtual Time Timer and Watchdog.

Definition at line 66 of file timer.h.

Member Enumeration Documentation

◆ DestroyPolicy

enum ns3::Timer::DestroyPolicy

The policy to use to manager the internal timer when an instance of the Timer class is destroyed or suspended.

In the case of suspension, only CANCEL_ON_DESTROY and REMOVE_ON_DESTROY apply.

These symbols have "Destroy" in their names for historical reasons.

Enumerator

CANCEL_ON_DESTROY

This policy cancels the event from the destructor of the Timer or from Suspend().

This is typically faster than REMOVE_ON_DESTROY but uses more memory.

REMOVE_ON_DESTROY

This policy removes the event from the simulation event list when the destructor of the Timer is invoked, or the Timer is suspended.

This is typically slower than Cancel, but frees memory.

CHECK_ON_DESTROY

This policy enforces a check from the destructor of the Timer to verify that the timer has already expired.

Definition at line 79 of file timer.h.

◆ State

enum ns3::Timer::State

The possible states of the Timer.

Enumerator
RUNNING	Timer is currently running.
EXPIRED	Timer has already expired.
SUSPENDED	Timer is suspended.

Definition at line 101 of file timer.h.

Constructor & Destructor Documentation

◆ Timer() [1/2]

ns3::Timer::Timer ( )

Create a timer with a default event lifetime management policy:

CHECK_ON_DESTROY

Definition at line 25 of file timer.cc.

References NS_LOG_FUNCTION.

◆ Timer() [2/2]

ns3::Timer::Timer ( DestroyPolicy destroyPolicy )

Parameters

[in] destroyPolicy the event lifetime management policies to use for destroy events

Definition at line 34 of file timer.cc.

References NS_LOG_FUNCTION.

◆ ~Timer()

ns3::Timer::~Timer ( )

Definition at line 43 of file timer.cc.

References ns3::EventId::Cancel(), CANCEL_ON_DESTROY, CHECK_ON_DESTROY, ns3::EventId::IsPending(), m_event, m_flags, m_impl, NS_FATAL_ERROR, NS_LOG_FUNCTION, ns3::EventId::Remove(), and REMOVE_ON_DESTROY.

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Member Function Documentation

◆ Cancel()

void ns3::Timer::Cancel ( )

Cancel the currently-running event if there is one.

Do nothing otherwise.

Definition at line 97 of file timer.cc.

References ns3::EventId::Cancel(), m_event, and NS_LOG_FUNCTION.

Referenced by ns3::TcpSocketBase::CancelAllTimers(), TimerStateTestCase::DoRun(), ns3::aodv::RoutingProtocol::HelloTimerExpire(), ns3::aodv::RoutingProtocol::NotifyInterfaceDown(), ns3::aodv::RoutingProtocol::NotifyRemoveAddress(), ns3::aodv::Neighbors::Purge(), ns3::dsr::DsrRouteCache::PurgeMac(), ns3::aodv::RoutingProtocol::RecvReplyAck(), ns3::TcpSocketBase::ReTxTimeout(), ns3::aodv::Neighbors::ScheduleTimer(), ns3::dsr::DsrRouteCache::ScheduleTimer(), ns3::dsr::DsrRouting::SendBuffTimerExpire(), ns3::Ipv6AutoconfiguredPrefix::StopPreferredTimer(), and ns3::Ipv6AutoconfiguredPrefix::StopValidTimer().

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◆ GetDelay()

Time ns3::Timer::GetDelay ( ) const

Returns: The currently-configured delay for the next Schedule.

Definition at line 72 of file timer.cc.

References m_delay, and NS_LOG_FUNCTION.

◆ GetDelayLeft()

Time ns3::Timer::GetDelayLeft ( ) const

Returns: The amount of time left until this timer expires.

This method returns zero if the timer is in EXPIRED state.

Definition at line 79 of file timer.cc.

References EXPIRED, ns3::Simulator::GetDelayLeft(), GetState(), m_delayLeft, m_event, NS_ASSERT, NS_LOG_FUNCTION, RUNNING, and SUSPENDED.

Referenced by ns3::dsdv::RoutingProtocol::RecvDsdv(), ns3::TcpSocketBase::SendPendingData(), ns3::aodv::RoutingProtocol::SendRequest(), ns3::aodv::RoutingProtocol::SendRerrMessage(), and ns3::aodv::RoutingProtocol::SendRerrWhenNoRouteToForward().

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◆ GetState()

Timer::State ns3::Timer::GetState ( ) const

Returns: The current state of the timer.

Definition at line 132 of file timer.cc.

References EXPIRED, IsExpired(), IsRunning(), IsSuspended(), NS_ASSERT, NS_LOG_FUNCTION, RUNNING, and SUSPENDED.

Referenced by TimerStateTestCase::DoRun(), and GetDelayLeft().

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◆ IsExpired()

bool ns3::Timer::IsExpired ( ) const

Returns: true if there is no currently-running event, false otherwise.

Definition at line 111 of file timer.cc.

References ns3::EventId::IsExpired(), IsSuspended(), m_event, and NS_LOG_FUNCTION.

Referenced by TimerStateTestCase::DoRun(), GetState(), ns3::TcpSocketBase::SendDataPacket(), and ns3::TcpSocketBase::SendPendingData().

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◆ IsRunning()

bool ns3::Timer::IsRunning ( ) const

Returns: true if there is a currently-running event, false otherwise.

Definition at line 118 of file timer.cc.

References ns3::EventId::IsPending(), IsSuspended(), m_event, and NS_LOG_FUNCTION.

Referenced by TimerStateTestCase::DoRun(), GetState(), ns3::olsr::RoutingProtocol::QueueMessage(), ns3::dsr::DsrRouting::SendBuffTimerExpire(), ns3::TcpSocketBase::SendPendingData(), ns3::aodv::RoutingProtocol::SendRerrMessage(), ns3::aodv::RoutingProtocol::SendRerrWhenNoRouteToForward(), ns3::Ipv6AutoconfiguredPrefix::StopPreferredTimer(), ns3::Ipv6AutoconfiguredPrefix::StopValidTimer(), and Suspend().

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◆ IsSuspended()

bool ns3::Timer::IsSuspended ( ) const

Returns: true if this timer was suspended and not yet resumed, false otherwise.

Definition at line 125 of file timer.cc.

References m_flags, NS_LOG_FUNCTION, and TIMER_SUSPENDED.

Referenced by ns3::dsr::DsrRouting::CheckSendBuffer(), TimerStateTestCase::DoRun(), GetState(), IsExpired(), and IsRunning().

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◆ Remove()

void ns3::Timer::Remove ( )

Remove from the simulation event-list the currently-running event if there is one.

Do nothing otherwise.

Definition at line 104 of file timer.cc.

References m_event, NS_LOG_FUNCTION, and ns3::EventId::Remove().

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◆ Resume()

void ns3::Timer::Resume ( )

Restart the timer to expire within the amount of time left saved during Suspend.

Calling Resume without a prior call to Suspend is an error.

Definition at line 187 of file timer.cc.

References m_delayLeft, m_event, m_flags, m_impl, NS_ASSERT, NS_LOG_FUNCTION, ns3::internal::TimerImpl::Schedule(), and TIMER_SUSPENDED.

Referenced by ns3::dsr::DsrRouting::CheckSendBuffer(), and TimerStateTestCase::DoRun().

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◆ Schedule() [1/2]

void ns3::Timer::Schedule ( )

Schedule a new event using the currently-configured delay, function, and arguments.

Definition at line 151 of file timer.cc.

References m_delay, NS_LOG_FUNCTION, and Schedule().

Referenced by ns3::dsr::DsrRouting::DsrRouting(), ns3::aodv::RoutingProtocol::DoInitialize(), TimerStateTestCase::DoRun(), TimerTemplateTestCase::DoRun(), ns3::aodv::RoutingProtocol::HelloTimerExpire(), ns3::olsr::RoutingProtocol::HelloTimerExpire(), ns3::olsr::RoutingProtocol::HnaTimerExpire(), ns3::olsr::RoutingProtocol::MidTimerExpire(), ns3::aodv::Neighbors::Purge(), ns3::dsr::DsrRouteCache::PurgeMac(), ns3::olsr::RoutingProtocol::QueueMessage(), ns3::aodv::RoutingProtocol::RerrRateLimitTimerExpire(), ns3::aodv::RoutingProtocol::RreqRateLimitTimerExpire(), Schedule(), ns3::aodv::Neighbors::ScheduleTimer(), ns3::dsr::DsrRouteCache::ScheduleTimer(), ns3::dsr::DsrRouting::SendBuffTimerExpire(), ns3::TcpSocketBase::SendDataPacket(), ns3::TcpSocketBase::SendPendingData(), ns3::dsdv::RoutingProtocol::SendPeriodicUpdate(), ns3::aodv::RoutingProtocol::Start(), ns3::dsdv::RoutingProtocol::Start(), ns3::Ipv6AutoconfiguredPrefix::StartPreferredTimer(), ns3::Ipv6AutoconfiguredPrefix::StartValidTimer(), and ns3::olsr::RoutingProtocol::TcTimerExpire().

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◆ Schedule() [2/2]

void ns3::Timer::Schedule ( Time delay )

Parameters

[in] delay the delay to use

Schedule a new event using the specified delay (ignore the delay set by Timer::SetDelay), function, and arguments.

Definition at line 158 of file timer.cc.

References ns3::EventId::IsPending(), m_event, m_impl, NS_ASSERT, NS_FATAL_ERROR, NS_LOG_FUNCTION, and ns3::internal::TimerImpl::Schedule().

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◆ SetArguments()

template<typename... Ts>

void ns3::Timer::SetArguments ( Ts... args )

Template Parameters

Ts	[deduced] Argument types

Parameters

[in] args arguments

Store these arguments in this Timer for later use by Timer::Schedule.

Definition at line 284 of file timer.h.

References m_impl, NS_FATAL_ERROR, and ns3::internal::TimerImpl::SetArgs().

Referenced by TimerStateTestCase::DoRun(), TimerTemplateTestCase::DoRun(), and ns3::aodv::RoutingProtocol::SendReplyByIntermediateNode().

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◆ SetDelay()

void ns3::Timer::SetDelay ( const Time & delay )

Parameters

[in] delay The delay

The next call to Schedule will schedule the timer with this delay.

Definition at line 65 of file timer.cc.

References m_delay, and NS_LOG_FUNCTION.

Referenced by ns3::dsr::DsrRouteCache::DsrRouteCache(), ns3::aodv::Neighbors::Neighbors(), TimerStateTestCase::DoRun(), TimerTemplateTestCase::DoRun(), ns3::olsr::RoutingProtocol::QueueMessage(), ns3::aodv::RoutingProtocol::SendReplyByIntermediateNode(), ns3::Ipv6AutoconfiguredPrefix::StartPreferredTimer(), and ns3::Ipv6AutoconfiguredPrefix::StartValidTimer().

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◆ SetFunction() [1/2]

template<typename FN >

void ns3::Timer::SetFunction ( FN fn )

Template Parameters

FN	[deduced] The type of the function.

Parameters

[in] fn the function

Store this function in this Timer for later use by Timer::Schedule.

Definition at line 268 of file timer.h.

References m_impl, and ns3::internal::MakeTimerImpl().

Referenced by ns3::dsr::DsrRouteCache::DsrRouteCache(), ns3::dsr::DsrRouting::DsrRouting(), ns3::aodv::Neighbors::Neighbors(), ns3::TcpSocketBase::TcpSocketBase(), ns3::TcpSocketBase::TcpSocketBase(), ns3::aodv::RoutingProtocol::DoInitialize(), TimerStateTestCase::DoRun(), TimerTemplateTestCase::DoRun(), ns3::dsr::DsrRouting::ScheduleLinkPacketRetry(), ns3::dsr::DsrRouting::ScheduleNetworkPacketRetry(), ns3::aodv::RoutingProtocol::ScheduleRreqRetry(), ns3::aodv::RoutingProtocol::SendReplyByIntermediateNode(), ns3::olsr::RoutingProtocol::SetIpv4(), ns3::aodv::RoutingProtocol::Start(), ns3::dsdv::RoutingProtocol::Start(), ns3::Ipv6AutoconfiguredPrefix::StartPreferredTimer(), and ns3::Ipv6AutoconfiguredPrefix::StartValidTimer().

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◆ SetFunction() [2/2]

template<typename MEM_PTR , typename OBJ_PTR >

void ns3::Timer::SetFunction	(	MEM_PTR	memPtr,
		OBJ_PTR	objPtr )

Template Parameters

MEM_PTR	[deduced] The type of the class member function.
OBJ_PTR	[deduced] The type of the class instance pointer.

Parameters

[in]	memPtr	the member function pointer
[in]	objPtr	the pointer to object

Store this function and object in this Timer for later use by Timer::Schedule.

Definition at line 276 of file timer.h.

References m_impl, and ns3::internal::MakeTimerImpl().

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◆ Suspend()

void ns3::Timer::Suspend ( )

Pause the timer and save the amount of time left until it was set to expire.

Subsequently calling Resume() will restart the Timer with the remaining time.

The DestroyPolicy set at construction determines whether the underlying Simulator::Event is cancelled or removed.

Calling Suspend on a non-running timer is an error.

Definition at line 170 of file timer.cc.

References ns3::EventId::Cancel(), CANCEL_ON_DESTROY, ns3::Simulator::GetDelayLeft(), IsRunning(), m_delayLeft, m_event, m_flags, NS_ASSERT, NS_LOG_FUNCTION, ns3::EventId::Remove(), REMOVE_ON_DESTROY, and TIMER_SUSPENDED.

Referenced by ns3::dsr::DsrRouting::CheckSendBuffer(), and TimerStateTestCase::DoRun().

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Member Data Documentation

◆ m_delay

Time ns3::Timer::m_delay

private

The delay configured for this Timer.

Definition at line 243 of file timer.h.

Referenced by GetDelay(), Schedule(), and SetDelay().

◆ m_delayLeft

Time ns3::Timer::m_delayLeft

private

The amount of time left on the Timer while it is suspended.

Definition at line 252 of file timer.h.

Referenced by GetDelayLeft(), Resume(), and Suspend().

◆ m_event

EventId ns3::Timer::m_event

private

The future event scheduled to expire the timer.

Definition at line 245 of file timer.h.

Referenced by ~Timer(), Cancel(), GetDelayLeft(), IsExpired(), IsRunning(), Remove(), Resume(), Schedule(), and Suspend().

◆ m_flags

int ns3::Timer::m_flags

private

Bitfield for Timer State, DestroyPolicy and InternalSuspended.

Internal:: The DestroyPolicy, State and InternalSuspended state are stored in this single bitfield. The State uses the low-order bits, so the other users of the bitfield have to be careful in defining their bits to avoid the State.

Definition at line 241 of file timer.h.

Referenced by ~Timer(), IsSuspended(), Resume(), and Suspend().

◆ m_impl

internal::TimerImpl* ns3::Timer::m_impl

private

The timer implementation, which contains the bound callback function and arguments.

Definition at line 250 of file timer.h.

Referenced by ~Timer(), Resume(), Schedule(), SetArguments(), SetFunction(), and SetFunction().

◆ TIMER_SUSPENDED

auto ns3::Timer::TIMER_SUSPENDED {1 << 7}

staticconstexprprivate

Internal bit marking the suspended timer state.

Definition at line 230 of file timer.h.

Referenced by IsSuspended(), Resume(), and Suspend().

The documentation for this class was generated from the following files:

src/core/model/timer.h
src/core/model/timer.cc

Public Types

Public Member Functions

Private Attributes

Static Private Attributes

Detailed Description

Member Enumeration Documentation

◆ DestroyPolicy

◆ State

Constructor & Destructor Documentation

◆ Timer() [1/2]

◆ Timer() [2/2]

◆ ~Timer()

Member Function Documentation

◆ Cancel()

◆ GetDelay()

◆ GetDelayLeft()

◆ GetState()

◆ IsExpired()

◆ IsRunning()

◆ IsSuspended()

◆ Remove()

◆ Resume()

◆ Schedule() [1/2]

◆ Schedule() [2/2]

◆ SetArguments()

◆ SetDelay()

◆ SetFunction() [1/2]

◆ SetFunction() [2/2]

◆ Suspend()

Member Data Documentation

◆ m_delay

◆ m_delayLeft

◆ m_event

◆ m_flags

◆ m_impl

◆ TIMER_SUSPENDED