Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uunet!mcsun!ukc!icdoc!citycs!phil
From: phil@cs.city.ac.uk (Phil Thompson)
Newsgroups: comp.windows.x
Subject: setjmp/longjmp in callbacks
Message-ID: <1991Jan16.151843.11043@cs.city.ac.uk>
Date: 16 Jan 91 15:18:43 GMT
Organization: City University
Lines: 13

I would like to set up a jmp_buf with setjmp(), create a widget and pass the
jmp_buf to one of the widget's callbacks as client data.  The callback will
then longjmp() using it.

Obviously I have to destroy the widget or remove the callback before the
function containing the setjmp() returns, and that function must handle
events somewhere.

Is there anything in the nature of X that means that this technique is
flawed?  Is there a cleaner method?

Thanks for any help,
Phil Thompson (cs.city.ac.uk)