Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!usc!ucsd!ucbvax!bloom-beacon!THYME.JPL.NASA.GOV!kaleb
From: kaleb@THYME.JPL.NASA.GOV (Kaleb Keithley)
Newsgroups: comp.windows.x
Subject: XSetErrorHandler question
Message-ID: <9008291546.AA05946@thyme.jpl.nasa.gov>
Date: 29 Aug 90 15:46:47 GMT
Sender: daemon@athena.mit.edu (Mr Background)
Organization: The Internet
Lines: 29


Consider the following (psuedo code):

nonFatalErrorHandler (...) {...}

main (...) {
XOpenDisplay (...);
XSetErrorHandler (nonFatalErrorHandler);
InitializeClientMessageEvent (...);
for (loop = 0; loop < 100; loop++) {
  XSendEvent (...); /* to an invalid window ID */
  XSync (...);
}
XCloseDisplay (...)
}

In the above sample, the error handler gets called once for each event sent 
to an invalid window.  But in my real program I am seeing the error handler 
called once for every four or five events sent to invalid windows.

Is this behaviour normal?  The O'Reilly Reference has little to say on the
subject.  I looked at the source, but I'm sorry to say, I couldn't draw any
conclusions from that.

-- 
Kaleb Keithley                      Jet Propeller Labs
kaleb@thyme.jpl.nasa.gov

"So that's what an invisible barrier looks like!"