A Discrete-Event Network Simulator
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fd-reader.h
Go to the documentation of this file.
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/*
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* Copyright (c) 2010 The Boeing Company
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*
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* SPDX-License-Identifier: GPL-2.0-only
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*
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* Author: Tom Goff <thomas.goff@boeing.com>
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*/
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#ifndef FD_READER_H
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#define FD_READER_H
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#include "
callback.h
"
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#include "
event-id.h
"
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#include <cstdint>
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#include <thread>
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#ifdef __WIN32__
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#include <BaseTsd.h>
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/**
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* Signed version of size_t
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*/
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typedef
SSIZE_T ssize_t;
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#endif
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/**
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* \file
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* \ingroup system
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* ns3::FdReader declaration.
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*/
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namespace
ns3
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{
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/**
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* \ingroup system
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* \brief A class that asynchronously reads from a file descriptor.
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*
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* This class can be used to start a system thread that reads from a
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* given file descriptor and invokes a given callback when data is
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* received. This class handles thread management automatically but
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* the \pname{DoRead()} method must be implemented by a subclass.
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*/
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class
FdReader
:
public
SimpleRefCount
<FdReader>
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{
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public
:
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/** Constructor. */
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FdReader
();
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/** Destructor. */
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virtual
~FdReader
();
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/**
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* Start a new read thread.
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*
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* \param [in] fd A valid file descriptor open for reading.
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*
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* \param [in] readCallback A callback to invoke when new data is
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* available.
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*/
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void
Start
(
int
fd,
Callback<void, uint8_t*, ssize_t>
readCallback);
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/**
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* Stop the read thread and reset internal state. This does not
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* close the file descriptor used for reading.
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*/
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void
Stop
();
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#ifdef __WIN32__
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/**
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* Keeps track if the Winsock library has been initialized.
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*/
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static
bool
winsock_initialized;
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#endif
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protected
:
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/**
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* \brief A structure representing data read.
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*/
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struct
Data
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{
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/** Default constructor, with null buffer and zero length. */
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Data
()
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:
m_buf
(nullptr),
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m_len
(0)
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{
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}
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/**
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* Construct from a buffer of a given length.
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*
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* \param [in] buf The buffer.
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* \param [in] len The size of the buffer, in bytes.
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*/
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Data
(uint8_t* buf, ssize_t len)
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:
m_buf
(buf),
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m_len
(len)
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{
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}
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/** The read data buffer. */
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uint8_t*
m_buf
;
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/** The size of the read data buffer, in bytes. */
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ssize_t
m_len
;
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};
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/**
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* \brief The read implementation.
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*
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* The value of \pname{m_len} returned controls further processing. The
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* callback function is only invoked when \pname{m_len} is positive; any
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* data read is not processed when \pname{m_len} is negative; reading
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* stops when \pname{m_len} is zero.
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*
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* The management of memory associated with \pname{m_buf} must be
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* compatible with the read callback.
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*
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* \return A structure representing what was read.
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*/
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virtual
FdReader::Data
DoRead
() = 0;
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/**
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* \brief The file descriptor to read from.
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*/
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int
m_fd
;
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private
:
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/** The asynchronous function which performs the read. */
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void
Run
();
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/** Event handler scheduled for destroy time to halt the thread. */
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void
DestroyEvent
();
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/** The main thread callback function to invoke when we have data. */
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Callback<void, uint8_t*, ssize_t>
m_readCallback
;
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/** The thread doing the read, created and launched by Start(). */
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std::thread
m_readThread
;
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/** Pipe used to signal events between threads. */
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int
m_evpipe
[2];
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/** Signal the read thread to stop. */
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bool
m_stop
;
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/**
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* The event scheduled for destroy time which will invoke DestroyEvent
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* and halt the thread.
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*/
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EventId
m_destroyEvent
;
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};
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}
// namespace ns3
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#endif
/* FD_READER_H */
callback.h
Declaration of the various callback functions.
ns3::Callback
Callback template class.
Definition
callback.h:422
ns3::EventId
An identifier for simulation events.
Definition
event-id.h:45
ns3::FdReader
A class that asynchronously reads from a file descriptor.
Definition
fd-reader.h:46
ns3::FdReader::m_evpipe
int m_evpipe[2]
Pipe used to signal events between threads.
Definition
fd-reader.h:139
ns3::FdReader::FdReader
FdReader()
Constructor.
Definition
unix-fd-reader.cc:34
ns3::FdReader::Run
void Run()
The asynchronous function which performs the read.
Definition
unix-fd-reader.cc:154
ns3::FdReader::Stop
void Stop()
Stop the read thread and reset internal state.
Definition
unix-fd-reader.cc:110
ns3::FdReader::m_stop
bool m_stop
Signal the read thread to stop.
Definition
fd-reader.h:141
ns3::FdReader::m_destroyEvent
EventId m_destroyEvent
The event scheduled for destroy time which will invoke DestroyEvent and halt the thread.
Definition
fd-reader.h:147
ns3::FdReader::DoRead
virtual FdReader::Data DoRead()=0
The read implementation.
ns3::FdReader::Start
void Start(int fd, Callback< void, uint8_t *, ssize_t > readCallback)
Start a new read thread.
Definition
unix-fd-reader.cc:51
ns3::FdReader::DestroyEvent
void DestroyEvent()
Event handler scheduled for destroy time to halt the thread.
Definition
unix-fd-reader.cc:102
ns3::FdReader::m_readCallback
Callback< void, uint8_t *, ssize_t > m_readCallback
The main thread callback function to invoke when we have data.
Definition
fd-reader.h:133
ns3::FdReader::m_readThread
std::thread m_readThread
The thread doing the read, created and launched by Start().
Definition
fd-reader.h:136
ns3::FdReader::m_fd
int m_fd
The file descriptor to read from.
Definition
fd-reader.h:124
ns3::FdReader::~FdReader
virtual ~FdReader()
Destructor.
Definition
unix-fd-reader.cc:44
ns3::SimpleRefCount
A template-based reference counting class.
Definition
simple-ref-count.h:70
event-id.h
ns3::EventId declarations.
ns3
Every class exported by the ns3 library is enclosed in the ns3 namespace.
ns3::FdReader::Data
A structure representing data read.
Definition
fd-reader.h:80
ns3::FdReader::Data::m_len
ssize_t m_len
The size of the read data buffer, in bytes.
Definition
fd-reader.h:103
ns3::FdReader::Data::Data
Data(uint8_t *buf, ssize_t len)
Construct from a buffer of a given length.
Definition
fd-reader.h:94
ns3::FdReader::Data::Data
Data()
Default constructor, with null buffer and zero length.
Definition
fd-reader.h:82
ns3::FdReader::Data::m_buf
uint8_t * m_buf
The read data buffer.
Definition
fd-reader.h:101
src
core
model
fd-reader.h
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