winix/core/basethread.h

/*
 * This file is a part of Winix
 * and is not publicly distributed
 * 
 * Copyright (c) 2010-2011, Tomasz Sowa
 * All rights reserved.
 * 
 */
 
#ifndef headerfile_winix_core_basethread
#define headerfile_winix_core_basethread

#include <pthread.h>
#include "synchro.h"



class BaseThread
{
public:
	
	BaseThread();

	// synchro object (must be set)
	void SetSynchro(Synchro * psynchro);

	// work mode
	// we have two modes:
	//  0 - there is a loop with SignalReceived() and Do()
	//      if SignalReceived() returns true then Do() is called
	//  1 - only Work() method is called
	//      the thread exits after Work() has finished
	// default: 0
	void Mode(int mode);

	// starting the second thread
	bool StartThread();

	// wake up the second thread
	// (if it waits for the signal)
	// you should use it with: synchro->Lock() and Unlock()
	// if the thread doesn't wait on a signal then nothing is done
	void WakeUpThread();

	// waiting until the thread exits
	// you should call WakeUpThread() before
	void WaitForThread();

	

	// virtual methods which should/can be inherited by your class
	// the methods will be called from the other thread

	// initialize the thread
	// (global objects are locked)
	// if it returns false then the thread immediately exits
	// default: true
	virtual bool Init() { return true; }

	// uninitialize the thread
	// this is called before the thread is prepare to detach
	// (global objects are locked)
	// it's called only if Init() returned true
	virtual void Uninit() {}

	// returns the thread id
	// this identifier is set by StartThread() metdhod
	pthread_t ThreadId();



protected:


	// signal came (work mode = 0 - default)
	// signal comes when an other thread calls WakeUpThread() method
	// check specific job and return true to call Do() next
	// (global objects are locked -- copy some global objects to local variables)
	virtual bool SignalReceived() { return false; };

	// if SignalReceived() returned true then this method is called
	// global objects are *not* locked -- use only your local variables
	// if you have to do something on global objects use synchro->Lock() and synchro->Unlock()
	virtual void Do() {}

	// this method is called after Init() when Mode(1) is used
	// this is for long-time job
	// this method is called only once
	// global objects are *not* locked
	virtual void Work() {}




protected:

	Synchro * synchro;
	pthread_t thread_id; // thread id - set by StartThread()
	pthread_cond_t thread_signal;
	int work_mode;
	bool wake_up_was_called;

	void SignalLoop();
	static void * StartRoutine(void *);
	bool BaseInit();
	void BaseUninit();
	bool BaseSignalReceived();
	void BaseDo();
	bool WaitForSignal();
	bool WaitForSignalSleep(time_t second);

	bool Lock();
	void Unlock();

	// if the work done by Do() is long time consuming you should periodically check
	// wheter there was a signal for exiting, and if it was just simply return from Do()
	// (it's checking with locking and unlocking)
	bool IsExitSignal();

};




#endif