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From: swick@ATHENA.MIT.EDU (Ralph Swick)
Newsgroups: comp.windows.x
Subject: Re: Running Event Processing from a callback
Message-ID: <9008101154.AA20837@lyre.MIT.EDU>
Date: 10 Aug 90 11:54:23 GMT
References: <1990Aug9.162333.6049@pcrat.uucp>
Sender: daemon@athena.mit.edu (Mr Background)
Organization: The Internet
Lines: 12


    Is it safe to run a pseudo-XtAppMainLoop() from a callback
    that was itself triggered by a XtAppMainLoop()?

absolutely.  That's the typical place such things will appear.

    If safe,
    are there any potentially ugly side-effects?

possibly :-)  but they're likely to be considered bugs, when found.
The biggest warning with the R4 implementation is to make sure you
properly unwind the stack; i.e. always return, never longjmp().