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From: mazer@bek-owl.caltech.edu (Jamie Mazer)
Newsgroups: comp.windows.x
Subject: Is X11R3 re-entrant?
Keywords: XtMainLoop() SIGALRM
Message-ID: <1990Jul22.100004.2941@laguna.ccsf.caltech.edu>
Date: 22 Jul 90 10:00:04 GMT
Sender: news@laguna.ccsf.caltech.edu
Reply-To: mazer@bek-owl.caltech.edu (Jamie Mazer)
Distribution: usa
Organization: California Institute of Technology
Lines: 19

Yet another novice X question :-(

Can anyone tell me how reentrant the code in R3 is? In particular,
what I'm trying to find out is "how safe it is to use Xt and Xlib
calls from inside a signal handler (namely SIGALRM - alarm (2))?"
My application uses Xaw to set up an interactive control pannel and
then periodically goes off, does some work and then updates output
windows (which contain widgets) and so forth. This "going off" is
triggered by a SIGALRM. So far I haven't had any problems making
toolkit calls from within the handler, but a friend suggested this
might be a dangerous thing to do.

Anybody care to comment on this issue? Please reply to me, I'll
summarize to the net if there's enough/any interest.

Thanks a lot
/Jamie
/  mazer@bek-owl.caltech.edu \
\ jmazer@caltech.bitnet      /