Thread Class Reference

A class for multithreading with a signaling system. More...

#include <thread.h>

Inheritance diagram for Thread:

Public Member Functions
	Thread (const char *name)
	Default constructor. More...
	~Thread ()
	Destructor:not virtual. More...
virtual void	run ()=0
	Main execution loop is defined here.
virtual void	preRun ()=0
	Called before entering the main execution loop, but after creating the thread.
virtual void	postRun ()=0
	Called after the main execution loop exits, but before joining the thread.
virtual void	preJoin ()
	Called before the thread is joined.
virtual void	postJoin ()
	Called after the thread has been joined.
virtual void	sendSignal (SignalContext signal_ctx)
	Send a signal to the thread.
virtual void	sendSignalAndWait (SignalContext signal_ctx)
	Send a signal to the thread and wait for all signals to be executed.
void	setAffinity (int i)
	API method for setting the thread affinity. More...
void	startCall ()
	API method: starts the thread.
virtual void	stopCall ()
	API method: stops the thread. More...
virtual void	requestStopCall ()
	API method: stops the thread. More...
virtual void	waitStopCall ()
	API method: waits until the thread is joined. More...
virtual void	waitReady ()
	Wait until thread has processed all its signals.

Protected Member Functions
void	mainRun ()
	Does the preRun, run, postRun sequence.
void	closeThread ()
	Sends exit signal to the thread, calls join. This method blocks until thread has exited. Set Thread::has_thread to false.

Static Protected Member Functions
static void *	mainRun_ (void *p)

Protected Attributes
std::string	name
	Name of the thread.
bool	has_thread
	true if thread has been started
bool	stop_requested
bool	thread_joined
std::mutex	start_mutex
	Mutex protecting start_condition.
std::condition_variable	start_condition
	Notified when the thread has been started.
std::mutex	mutex
	Mutex protecting the condition variable and signal queue.
std::condition_variable	condition
	Condition variable for the signal queue (triggered when all signals processed). Not necessarily used by all subclasses.
std::mutex	loop_mutex
	Protects thread's main execution loop (if necessary)
std::deque< SignalContext >	signal_fifo
	Signal queue (fifo). Redefine in child classes.
bool	loop
	Use this boolean to control if the main loop in Thread:run should exit.
int	core_id
pthread_attr_t	thread_attr
	Thread attributes, pthread_* way.
cpu_set_t	cpuset
pthread_t	internal_thread

Private Member Functions
	Thread (const Thread &)
	Void copy-constructor: this class is non-copyable. More...
void	operator= (const Thread &)
	Void copy-constructor: this class is non-copyable.

Detailed Description

A class for multithreading with a signaling system.

Thread class has a simple system for receiving signals. Signals are placed into a mutex protected fifo queue. The internal struct SignalContext defines data structures passed by the signals. Subclasses typically implement their own SingalContext

Constructor & Destructor Documentation

Thread() [1/2]

Thread::Thread

(

const char *

name

)

Default constructor.

Parameters

name	- name of the thread
core_id	- bind to a specific processor. Default=-1, i.e. no processor affinity

~Thread()

Thread::~Thread

(

)

Destructor:not virtual.

Each subclass needs to invoke it's own Thread::stopCall() method

Thread() [2/2]

Thread::Thread ( const Thread &  )

private

Void copy-constructor: this class is non-copyable.

We have a mutex member in this class. Those are non-copyable. Other possibility would be to manage a pointer to the mutex. The "pointerization" can be done at some other level as well (say, using pointers of this object)

Copying threads is not a good idea either

Member Function Documentation

requestStopCall()

void Thread::requestStopCall ( )

virtual

API method: stops the thread.

Like Thread::stopCall() but does not block. Waiting for the thread to join is done in Thread::waitStoppedCall()

Reimplemented in LiveThread, OpenGLThread, ValkkaFSWriterThread, FileCacheThread, FileThread, USBDeviceThread, FDWriteThread, DecoderThread, and ValkkaFSReaderThread.

setAffinity()

void Thread::setAffinity

(

int

i

)

API method for setting the thread affinity.

Use before starting the thread

stopCall()

void Thread::stopCall ( )

virtual

API method: stops the thread.

If Thread::has_thread is true, sends exit signal to the thread and calls Thread::closeThread Waits until the thread is joined

Reimplemented in TestThread.

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waitStopCall()

void Thread::waitStopCall ( )

virtual

API method: waits until the thread is joined.

Use with Thread::requestStopCall

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

• /home/sampsa/C/valkka/include/thread.h
• /home/sampsa/C/valkka/src/thread.cpp