Subj : Return value from worker thred when the working thread must be suspend after calculation???
To   : comp.os.ms-windows.programmer.win32,microsoft.public.vc.language,comp.programming.threads
From : pattreeya
Date : Mon Aug 29 2005 05:16 pm

Hello,

  it will be a very kind of you if someone can help me with the
following problem.


   After finish calling "Calculate" function, I would like
to send the result to the main thread and suspend the working thread.
how can i get the the return value from this threadproc to be used by
the main thread?



My idea for the code goes like this:

struct ST_CALC{
   int start;
   int end;
}


int Calculate(bool flag,int start, int end)
{
   int ret_value = 0;
    if( ! flag ){
		for(int i=start; i<end; i++)
		  ++ret_value;

     }
     else{
		for(int i=start; i<end; i++)
		  ++ret_value;

	}
    return ret_value;

}
DWORD WINAPI CalcThreadProc(void * param)
{
	ST_CALC* st_calc =(ST_CALC *)(param);

	while(1){
	   if( ::WaitForSingleObject(evShouldStop, 0) == WAIT_OBJECT_0)
	        break;

		int ret = Calculate(false, st_calc->start, st_calc->end);

		::SuspendThread(hRtCalcThrd);
      //??? How can I get return value, "ret", to be use by the calling
thread?  Should I call put the SuspendThread outside this func after
get the return value?

	}
        //????
	::ExitThread(0);
}

int MyCalculate(int start, int end)
{
	result = Calculate(true, start, end);

	if(result){
		::ResumeThread(hRtCalcThrd);
	}
        //??? I would like to use the return value from threadproc
        inside this function, how can we get its return value??

	return result;
}

void Start(int start, int end)
{
        ST_CALC* p;
        p->start = start;
        p->end = end;

	hRtCalcThrd  = ::CreateThread(0, 0, CalcThreadProc, p,
CREATE_SUSPENDED, m_idThread); 

	result = MyCalculate();	

}

.