ns3::FdReader Class Reference

A class that asynchronously reads from a file descriptor. More...

#include "fd-reader.h"

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Classes
struct	Data
	A structure representing data read. More...

Public Member Functions
	FdReader ()
	Constructor.
virtual	~FdReader ()
	Destructor.
void	Start (int fd, Callback< void, uint8_t *, ssize_t > readCallback)
	Start a new read thread.
void	Stop ()
	Stop the read thread and reset internal state.
Public Member Functions inherited from ns3::SimpleRefCount< FdReader >
	SimpleRefCount ()
	Default constructor.
	SimpleRefCount (const SimpleRefCount &o)
	Copy constructor.
uint32_t	GetReferenceCount () const
	Get the reference count of the object.
SimpleRefCount &	operator= (const SimpleRefCount &o)
	Assignment operator.
void	Ref () const
	Increment the reference count.
void	Unref () const
	Decrement the reference count.

Protected Member Functions
virtual FdReader::Data	DoRead ()=0
	The read implementation.

Protected Attributes
int	m_fd
	The file descriptor to read from.

Private Member Functions
void	DestroyEvent ()
	Event handler scheduled for destroy time to halt the thread.
void	Run ()
	The asynchronous function which performs the read.

Private Attributes
EventId	m_destroyEvent
	The event scheduled for destroy time which will invoke DestroyEvent and halt the thread.
int	m_evpipe [2]
	Pipe used to signal events between threads.
Callback< void, uint8_t *, ssize_t >	m_readCallback
	The main thread callback function to invoke when we have data.
std::thread	m_readThread
	The thread doing the read, created and launched by Start().
bool	m_stop
	Signal the read thread to stop.

Detailed Description

A class that asynchronously reads from a file descriptor.

This class can be used to start a system thread that reads from a given file descriptor and invokes a given callback when data is received. This class handles thread management automatically but the DoRead() method must be implemented by a subclass.

Definition at line 45 of file fd-reader.h.

Constructor & Destructor Documentation

FdReader()

ns3::FdReader::FdReader

(

)

Constructor.

Definition at line 34 of file unix-fd-reader.cc.

References m_evpipe, and NS_LOG_FUNCTION.

~FdReader()

ns3::FdReader::~FdReader ( )

virtual

Destructor.

Definition at line 44 of file unix-fd-reader.cc.

References NS_LOG_FUNCTION, and Stop().

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Member Function Documentation

DestroyEvent()

void ns3::FdReader::DestroyEvent ( )

private

Event handler scheduled for destroy time to halt the thread.

Definition at line 102 of file unix-fd-reader.cc.

References NS_LOG_FUNCTION, Stop(), and ns3::SimpleRefCount< FdReader >::Unref().

Referenced by Start().

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DoRead()

virtual FdReader::Data ns3::FdReader::DoRead ( )

protectedpure virtual

The read implementation.

The value of m_len returned controls further processing. The callback function is only invoked when m_len is positive; any data read is not processed when m_len is negative; reading stops when m_len is zero.

The management of memory associated with m_buf must be compatible with the read callback.

Returns

A structure representing what was read.

Implemented in ns3::FdNetDeviceFdReader, ns3::NetmapNetDeviceFdReader, and ns3::TapBridgeFdReader.

Referenced by Run().

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Run()

void ns3::FdReader::Run ( )

private

The asynchronous function which performs the read.

Definition at line 154 of file unix-fd-reader.cc.

References data, DoRead(), m_evpipe, m_fd, m_readCallback, m_stop, NS_FATAL_ERROR, and NS_LOG_FUNCTION.

Referenced by Start().

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Start()

void ns3::FdReader::Start	(	int	fd,
		Callback< void, uint8_t *, ssize_t >	readCallback )

Start a new read thread.

Parameters

[in]	fd	A valid file descriptor open for reading.
[in]	readCallback	A callback to invoke when new data is available.

Definition at line 51 of file unix-fd-reader.cc.

References DestroyEvent(), ns3::EventId::IsPending(), m_destroyEvent, m_evpipe, m_fd, m_readCallback, m_readThread, NS_ASSERT_MSG, NS_FATAL_ERROR, NS_LOG_FUNCTION, NS_LOG_LOGIC, ns3::SimpleRefCount< FdReader >::Ref(), Run(), and ns3::Simulator::ScheduleDestroy().

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Stop()

void ns3::FdReader::Stop

(

)

Stop the read thread and reset internal state.

This does not close the file descriptor used for reading.

Definition at line 110 of file unix-fd-reader.cc.

References m_evpipe, m_fd, m_readCallback, m_readThread, m_stop, NS_LOG_FUNCTION, NS_LOG_WARN, and ns3::Callback< R, UArgs >::Nullify().

Referenced by ~FdReader(), and DestroyEvent().

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Member Data Documentation

m_destroyEvent

EventId ns3::FdReader::m_destroyEvent

private

The event scheduled for destroy time which will invoke DestroyEvent and halt the thread.

Definition at line 147 of file fd-reader.h.

Referenced by Start().

m_evpipe

int ns3::FdReader::m_evpipe[2]

private

Pipe used to signal events between threads.

Definition at line 139 of file fd-reader.h.

Referenced by FdReader(), Run(), Start(), and Stop().

m_fd

int ns3::FdReader::m_fd

protected

The file descriptor to read from.

Definition at line 124 of file fd-reader.h.

Referenced by ns3::FdNetDeviceFdReader::DoRead(), ns3::NetmapNetDeviceFdReader::DoRead(), ns3::TapBridgeFdReader::DoRead(), Run(), Start(), and Stop().

m_readCallback

Callback<void, uint8_t*, ssize_t> ns3::FdReader::m_readCallback

private

The main thread callback function to invoke when we have data.

Definition at line 133 of file fd-reader.h.

Referenced by Run(), Start(), and Stop().

m_readThread

std::thread ns3::FdReader::m_readThread

private

The thread doing the read, created and launched by Start().

Definition at line 136 of file fd-reader.h.

Referenced by Start(), and Stop().

m_stop

bool ns3::FdReader::m_stop

private

Signal the read thread to stop.

Definition at line 141 of file fd-reader.h.

Referenced by Run(), and Stop().

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

• src/core/model/fd-reader.h
• src/core/model/unix-fd-reader.cc
• src/core/model/win32-fd-reader.cc