Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!uflorida!rex!rouge!gator.cacs.usl.edu
From: pcb@gator.cacs.usl.edu (Peter C. Bahrs)
Newsgroups: comp.windows.x
Subject: RE: mainloop and signals
Message-ID: <5007@rouge.usl.edu>
Date: 8 Mar 90 16:12:03 GMT
Sender: anon@rouge.usl.edu
Distribution: usa
Organization: The Center for Advanced Computer Studies, USL
Lines: 50


 > In article <23695@masscomp.ccur.com> mitch@westford.ccur.com (Mitchel Kuninsky) writes:
 > :I envision a signal handler like:
 > :
 > :	SignalHandler
 > :	{
 > :	    sigFlag = TRUE;
 > :	}
 > :
 > :and an XtMainLoop like:
 > :
 > :	MyMainLoop()
 > :	{
 > :	    XEvent event;
 > :
 > :	    for (;;)
 > :	    {
 > :(1)		XtNextEvent( &event );
 > :		if (event.type != NULL_EVENT)	/* or something like this. */
 > :		    XtDispatchEvent( &event );
 > :		if (sigFlag)
 > :		{
 > :		    process signal.
 > :		    Inhibit signals.
 > :		    sigFlag = FALSE;
 > :(2)		    Enable signals.
 > :		}
 > :	    }
 > :	}
 > 
 > This may be kind of nit-picking, but ... You have a nasty race here.
 > What if a signal arrives between the re-enabling of signals at (2) and
 > the next call to XtNextEvent at (1).
 > 
 > I believe this points out the need to have the signal-handling more
 > tightly integrated with the Intrinsics code.
 > 
I would like to do a similar thing...instead of using signals I want to
do a select on sockets.  Any comments or suggestions as to get this 
more 'tightly integrated...' with Intrinsics?


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| Peter C. Bahrs                                                         |
| The USL-NASA Project                                                   |
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