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Re: vbl tasks
- To: allenb@cs.uoregon.edu
- Subject: Re: vbl tasks
- From: Gary Byers <gb@cambridge.apple.com>
- Date: Thu, 29 Aug 1991 19:02:54 EDT
- Cc: info-mcl@cambridge.apple.com
- In-reply-to: Your message of Thu, 29 Aug 91 11:13:06 PDT
For a variety of reasons, it's generally not possible to write code that
executes at interrupt time in Macintosh Common Lisp. (One reason is that
MCL code assumes that certain other registers - as well as A5 - have
well-defined values on function entry, and the callback mechanisms (DEFPASCAL
and DEFCCALLABLE) have no way to properly initialize these registers at
interrupt time.)
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