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[Bug-mit-scheme] [bug #24253] possible race condition in Edwin X debugge

From: Taylor R. Campbell
Subject: [Bug-mit-scheme] [bug #24253] possible race condition in Edwin X debugger screen creation/deletion
Date: Sat, 13 Sep 2008 10:11:20 +0000
User-agent: Mozilla/5.0 (Macintosh; U; PPC Mac OS X; en-US) AppleWebKit/523 (KHTML, like Gecko, Safari/523.10) OmniWeb/v621.0.99313


                 Summary: possible race condition in Edwin X debugger screen
                 Project: MIT/GNU Scheme
            Submitted by: riastradh
            Submitted on: Sat Sep 13 10:11:19 2008
                Category: None
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any



Cause an error that brings up a debugger screen in X.  Hit `p' to choose a
restart.  Hit `C-g' to abort the choice.  I observe some flickering of screens
and then a new debugger screen presenting the error:

;The object 2, passed as the first argument to xterm-map-y-size, is not in
the correct range.

Re-evaluating the call to XTERM-MAP-Y-SIZE in one of the debugger's REPLs
yields the expected numeric result, so the editor's X terminals appear to be
briefly desynchronized from the microcode's.  This is reproducible enough that
it may not even be a race condition so much as merely disordered event
processing somewhere.


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