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From: hdg@otter.hpl.hp.com (Hugh Duggan)
Newsgroups: comp.os.os2.misc
Subject: Re: knowing when a child process has died
Message-ID: <44610004@otter.hpl.hp.com>
Date: 21 Feb 91 09:40:38 GMT
References: <15458@uswat.UUCP>
Organization: Hewlett-Packard Laboratories, Bristol, UK.
Lines: 41

>  I need to know how to determine when a particular child process has 
>  died - at any given time in my program.  
> 
>  ...
> 
>  Ilene
> ----------

    You could create a thread which would block on a DosCWait() call.
This could then change some global data (protected by semaphore), or
post a message on a queue to inform the main thread.  I do something
very close to this in some code that I am developing, and it works
very well.  The thread procedure looks something like this:



VOID FAR CrashDetectThread()
{
    while ( TRUE )
    {
	RESULTCODES rc;
	PID	    pidEnded;

	DosCwait( DCWA_PROCESS, DCWW_WAIT, &rc, &pidEnded, 0 );

	//  Once I have got to here, a child process has died.
	
	if ( rc.codeTerminate != TC_EXIT )
	{
	    //  ---------------- A child has died abnormally ------------- 

	    //  Do stuff
	}
    }
}


    I hope this helps,

    Hugh Duggan,
    HP Labs, Bristol