a calendar queue event scheduler More...

#include <calendar-scheduler.h>

Inheritance diagram for ns3::CalendarScheduler:

Collaboration diagram for ns3::CalendarScheduler:

Public Member Functions
	CalendarScheduler ()

virtual	~CalendarScheduler ()

virtual void	Insert (const Event &ev)

virtual bool	IsEmpty (void) const

virtual Event	PeekNext (void) const

virtual void	Remove (const Event &ev)

virtual Event	RemoveNext (void)
	This method cannot be invoked if the list is empty. More...

Public Member Functions inherited from ns3::Scheduler
virtual	~Scheduler ()=0

Public Member Functions inherited from ns3::Object
	Object ()
	Constructor. More...

virtual	~Object ()
	Destructor. More...

void	AggregateObject (Ptr< Object > other)
	Aggregate two Objects together. More...

void	Dispose (void)
	Dispose of this Object. More...

AggregateIterator	GetAggregateIterator (void) const
	Get an iterator to the Objects aggregated to this one. More...

virtual TypeId	GetInstanceTypeId (void) const
	Implement the GetInstanceTypeId method defined in ObjectBase. More...

template<typename T >
Ptr< T >	GetObject (void) const
	Get a pointer to the requested aggregated Object. More...

template<typename T >
Ptr< T >	GetObject (TypeId tid) const
	Get a pointer to the requested aggregated Object. More...

void	Initialize (void)
	Invoke DoInitialize on all Objects aggregated to this one. More...

Public Member Functions inherited from ns3::SimpleRefCount< Object, ObjectBase, ObjectDeleter >
	SimpleRefCount ()
	Constructor. More...

	SimpleRefCount (const SimpleRefCount &o)
	Copy constructor. More...

uint32_t	GetReferenceCount (void) const
	Get the reference count of the object. More...

SimpleRefCount &	operator= (const SimpleRefCount &o)
	Assignment. More...

void	Ref (void) const
	Increment the reference count. More...

void	Unref (void) const
	Decrement the reference count. More...

Public Member Functions inherited from ns3::ObjectBase
virtual	~ObjectBase ()
	Virtual destructor. More...

void	GetAttribute (std::string name, AttributeValue &value) const
	Get the value of an attribute, raising fatal errors if unsuccessful. More...

bool	GetAttributeFailSafe (std::string name, AttributeValue &value) const
	Get the value of an attribute without raising erros. More...

void	SetAttribute (std::string name, const AttributeValue &value)
	Set a single attribute, raising fatal errors if unsuccessful. More...

bool	SetAttributeFailSafe (std::string name, const AttributeValue &value)
	Set a single attribute without raising errors. More...

bool	TraceConnect (std::string name, std::string context, const CallbackBase &cb)
	Connect a TraceSource to a Callback with a context. More...

bool	TraceConnectWithoutContext (std::string name, const CallbackBase &cb)
	Connect a TraceSource to a Callback without a context. More...

bool	TraceDisconnect (std::string name, std::string context, const CallbackBase &cb)
	Disconnect from a TraceSource a Callback previously connected with a context. More...

bool	TraceDisconnectWithoutContext (std::string name, const CallbackBase &cb)
	Disconnect from a TraceSource a Callback previously connected without a context. More...

Static Public Member Functions
static TypeId	GetTypeId (void)

Static Public Member Functions inherited from ns3::Scheduler
static TypeId	GetTypeId (void)

Static Public Member Functions inherited from ns3::Object
static TypeId	GetTypeId (void)
	Register this type. More...

Static Public Member Functions inherited from ns3::SimpleRefCount< Object, ObjectBase, ObjectDeleter >
static void	Cleanup (void)
	Noop. More...

Static Public Member Functions inherited from ns3::ObjectBase
static TypeId	GetTypeId (void)
	Get the type ID. More...

Private Types
typedef std::list< Scheduler::Event >	Bucket

Private Member Functions
uint32_t	CalculateNewWidth (void)

void	DoInsert (const Event &ev)

Scheduler::Event	DoRemoveNext (void)

void	DoResize (uint32_t newSize, uint32_t newWidth)

uint32_t	Hash (uint64_t key) const

void	Init (uint32_t nBuckets, uint64_t width, uint64_t startPrio)

void	PrintInfo (void)

void	Resize (uint32_t newSize)

void	ResizeDown (void)

void	ResizeUp (void)

Private Attributes
Bucket *	m_buckets

uint64_t	m_bucketTop

uint32_t	m_lastBucket

uint64_t	m_lastPrio

uint32_t	m_nBuckets

uint32_t	m_qSize

uint64_t	m_width

Additional Inherited Members
Protected Member Functions inherited from ns3::Object
	Object (const Object &o)
	Copy an Object. More...

virtual void	DoDispose (void)
	Destructor implementation. More...

virtual void	DoInitialize (void)
	Initialize() implementation. More...

virtual void	NotifyNewAggregate (void)
	Notify all Objects aggregated to this one of a new Object being aggregated. More...

Protected Member Functions inherited from ns3::ObjectBase
void	ConstructSelf (const AttributeConstructionList &attributes)
	Complete construction of ObjectBase; invoked by derived classes. More...

virtual void	NotifyConstructionCompleted (void)
	Notifier called once the ObjectBase is fully constructed. More...

Related Functions inherited from ns3::ObjectBase
static TypeId	GetObjectIid (void)
	Ensure the TypeId for ObjectBase gets fully configured to anchor the inheritance tree properly. More...

Detailed Description

a calendar queue event scheduler

Introspection did not find any typical Config paths.

This event scheduler is a direct implementation of the algorithm known as a calendar queue. first published in 1988 in "Calendar Queues: A Fast O(1) Priority Queue Implementation for the Simulation Event Set Problem" by Randy Brown. There are many refinements published later but this class implements the original algorithm (to the best of my knowledge).

Note: This queue is much slower than I expected (much slower than the std::map queue) and this seems to be because the original resizing policy is horribly bad. This is most likely the reason why there have been so many variations published which all slightly tweak the resizing heuristics to obtain a better distribution of events across buckets.

No Attributes are defined for this type.
No TraceSources are defined for this type.
Size of this type is 88 bytes (on a 64-bit architecture).

Definition at line 53 of file calendar-scheduler.h.

Member Typedef Documentation

typedef std::list<Scheduler::Event> ns3::CalendarScheduler::Bucket

private

Definition at line 81 of file calendar-scheduler.h.

Constructor & Destructor Documentation

ns3::CalendarScheduler::CalendarScheduler ( )

Definition at line 52 of file calendar-scheduler.cc.

References Init(), m_qSize, and NS_LOG_FUNCTION.

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ns3::CalendarScheduler::~CalendarScheduler ( )

virtual

Definition at line 58 of file calendar-scheduler.cc.

References m_buckets, and NS_LOG_FUNCTION.

Member Function Documentation

uint32_t ns3::CalendarScheduler::CalculateNewWidth ( void )

private

Definition at line 278 of file calendar-scheduler.cc.

References DoInsert(), DoRemoveNext(), m_bucketTop, m_lastBucket, m_lastPrio, m_qSize, and NS_LOG_FUNCTION.

Referenced by Resize().

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void ns3::CalendarScheduler::DoInsert ( const Event & ev )

private

Definition at line 100 of file calendar-scheduler.cc.

References Hash(), ns3::Scheduler::Event::key, m_buckets, ns3::Scheduler::EventKey::m_ts, ns3::Scheduler::EventKey::m_uid, NS_LOG_FUNCTION, and NS_LOG_LOGIC.

Referenced by CalculateNewWidth(), DoResize(), and Insert().

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Scheduler::Event ns3::CalendarScheduler::DoRemoveNext ( void )

private

Definition at line 170 of file calendar-scheduler.cc.

References Hash(), IsEmpty(), ns3::Scheduler::Event::key, m_buckets, m_bucketTop, ns3::Scheduler::EventKey::m_context, m_lastBucket, m_lastPrio, m_nBuckets, ns3::Scheduler::EventKey::m_ts, ns3::Scheduler::EventKey::m_uid, m_width, NS_ASSERT, and NS_LOG_FUNCTION.

Referenced by CalculateNewWidth(), and RemoveNext().

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void ns3::CalendarScheduler::DoResize	(	uint32_t	newSize,
		uint32_t	newWidth
	)

private

Definition at line 357 of file calendar-scheduler.cc.

References DoInsert(), Init(), m_buckets, m_lastPrio, m_nBuckets, and NS_LOG_FUNCTION.

Referenced by Resize().

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TypeId ns3::CalendarScheduler::GetTypeId ( void )

static

Definition at line 42 of file calendar-scheduler.cc.

References ns3::TypeId::SetParent().

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uint32_t ns3::CalendarScheduler::Hash ( uint64_t key ) const

inlineprivate

Definition at line 91 of file calendar-scheduler.cc.

References m_nBuckets, m_width, and NS_LOG_FUNCTION.

Referenced by DoInsert(), DoRemoveNext(), Init(), and Remove().

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void ns3::CalendarScheduler::Init	(	uint32_t	nBuckets,
		uint64_t	width,
		uint64_t	startPrio
	)

private

Definition at line 65 of file calendar-scheduler.cc.

References Hash(), m_buckets, m_bucketTop, m_lastBucket, m_lastPrio, m_nBuckets, m_width, and NS_LOG_FUNCTION.

Referenced by CalendarScheduler(), and DoResize().

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void ns3::CalendarScheduler::Insert ( const Event & ev )

virtual

Parameters

ev	event to store in the event list

Implements ns3::Scheduler.

Definition at line 121 of file calendar-scheduler.cc.

References DoInsert(), m_qSize, NS_LOG_FUNCTION, and ResizeUp().

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bool ns3::CalendarScheduler::IsEmpty ( void ) const

virtual

Returns: true if the event list is empty and false otherwise.

Implements ns3::Scheduler.

Definition at line 129 of file calendar-scheduler.cc.

References m_qSize, and NS_LOG_FUNCTION.

Referenced by DoRemoveNext(), PeekNext(), Remove(), and RemoveNext().

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Scheduler::Event ns3::CalendarScheduler::PeekNext ( void ) const

virtual

Returns: a pointer to the next earliest event. The caller takes ownership of the returned pointer.

This method cannot be invoked if the list is empty.

Implements ns3::Scheduler.

Definition at line 135 of file calendar-scheduler.cc.

References ns3::Scheduler::Event::impl, IsEmpty(), ns3::Scheduler::Event::key, m_buckets, m_bucketTop, ns3::Scheduler::EventKey::m_context, m_lastBucket, m_nBuckets, ns3::Scheduler::EventKey::m_ts, ns3::Scheduler::EventKey::m_uid, m_width, NS_ASSERT, and NS_LOG_FUNCTION.

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void ns3::CalendarScheduler::PrintInfo ( void )

private

Definition at line 78 of file calendar-scheduler.cc.

References m_buckets, m_nBuckets, m_width, and NS_LOG_FUNCTION.

void ns3::CalendarScheduler::Remove ( const Event & ev )

virtual

Parameters

ev	the event to remove

This methods cannot be invoked if the list is empty.

Implements ns3::Scheduler.

Definition at line 232 of file calendar-scheduler.cc.

References Hash(), ns3::Scheduler::Event::impl, IsEmpty(), ns3::Scheduler::Event::key, m_buckets, m_qSize, ns3::Scheduler::EventKey::m_ts, ns3::Scheduler::EventKey::m_uid, NS_ASSERT, NS_LOG_FUNCTION, and ResizeDown().

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Scheduler::Event ns3::CalendarScheduler::RemoveNext ( void )

virtual

This method cannot be invoked if the list is empty.

Remove the next earliest event from the event list.

Implements ns3::Scheduler.

Definition at line 217 of file calendar-scheduler.cc.

References DoRemoveNext(), IsEmpty(), ns3::Scheduler::Event::key, m_bucketTop, m_lastBucket, m_qSize, ns3::Scheduler::EventKey::m_ts, ns3::Scheduler::EventKey::m_uid, NS_ASSERT, NS_LOG_FUNCTION, NS_LOG_LOGIC, and ResizeDown().

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void ns3::CalendarScheduler::Resize ( uint32_t newSize )

private

Definition at line 376 of file calendar-scheduler.cc.

References CalculateNewWidth(), DoResize(), and NS_LOG_FUNCTION.

Referenced by ResizeDown(), and ResizeUp().

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void ns3::CalendarScheduler::ResizeDown ( void )

private

Definition at line 267 of file calendar-scheduler.cc.

References m_nBuckets, m_qSize, NS_LOG_FUNCTION, and Resize().

Referenced by Remove(), and RemoveNext().

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void ns3::CalendarScheduler::ResizeUp ( void )

private

Definition at line 256 of file calendar-scheduler.cc.

References m_nBuckets, m_qSize, NS_LOG_FUNCTION, and Resize().

Referenced by Insert().

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Member Data Documentation

Bucket* ns3::CalendarScheduler::m_buckets

private

Definition at line 82 of file calendar-scheduler.h.

Referenced by DoInsert(), DoRemoveNext(), DoResize(), Init(), PeekNext(), PrintInfo(), Remove(), and ~CalendarScheduler().

uint64_t ns3::CalendarScheduler::m_bucketTop

private

Definition at line 90 of file calendar-scheduler.h.

Referenced by CalculateNewWidth(), DoRemoveNext(), Init(), PeekNext(), and RemoveNext().

uint32_t ns3::CalendarScheduler::m_lastBucket

private

Definition at line 88 of file calendar-scheduler.h.

Referenced by CalculateNewWidth(), DoRemoveNext(), Init(), PeekNext(), and RemoveNext().

uint64_t ns3::CalendarScheduler::m_lastPrio

private

Definition at line 92 of file calendar-scheduler.h.

Referenced by CalculateNewWidth(), DoRemoveNext(), DoResize(), and Init().

uint32_t ns3::CalendarScheduler::m_nBuckets

private

Definition at line 84 of file calendar-scheduler.h.

Referenced by DoRemoveNext(), DoResize(), Hash(), Init(), PeekNext(), PrintInfo(), ResizeDown(), and ResizeUp().

uint32_t ns3::CalendarScheduler::m_qSize

private

Definition at line 94 of file calendar-scheduler.h.

Referenced by CalculateNewWidth(), CalendarScheduler(), Insert(), IsEmpty(), Remove(), RemoveNext(), ResizeDown(), and ResizeUp().

uint64_t ns3::CalendarScheduler::m_width

private

Definition at line 86 of file calendar-scheduler.h.

Referenced by DoRemoveNext(), Hash(), Init(), PeekNext(), and PrintInfo().

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

src/core/model/calendar-scheduler.h
src/core/model/calendar-scheduler.cc

Public Member Functions

Static Public Member Functions

Private Types

Private Member Functions

Private Attributes

Additional Inherited Members

Detailed Description

Member Typedef Documentation

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation