Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!ucbvax!agate!eos!ptolemy!raymond
From: raymond@ptolemy.arc.nasa.gov (Eric A. Raymond)
Newsgroups: comp.sys.ibm.pc
Subject: Re: Control-Break ignored in Turbo-C graphics mode....
Message-ID: <1075@ptolemy.arc.nasa.gov>
Date: 7 Apr 89 18:57:55 GMT
References: <89Apr4.202845edt.2759@godzilla.eecg.toronto.edu> <4212@ttidca.TTI.COM>
Reply-To: raymond@ptolemy.arc.nasa.gov (Eric A. Raymond)
Distribution: na
Organization: NASA Ames Research Center, Moffett Field, CA
Lines: 13

The problem is that checking for ^C is performed only on
system calls (i.e. the I/O routines).  When you are in
graphics mode, these instructions are not being accessed.

The solution is to include a call to kbhit() within a tight loop in
graphics mode.  This performs an unobtrusive system call during which
^C is serviced.  (I assume one call to kbhit does not interfere with a
later call?)

Now, how to get rid of the ^C echo?
-- 
Eric A. Raymond  (raymond@ptolemy.arc.nasa.gov)
"A hungry mob is an angry mob"