jmaley@pc.ecn.purdue.edu.UUCP (James Maley) (09/24/86)
Part Three of Goldberg and Robson book on Smalltalk-80 ("the Blue Book")
describes an example simulation modeling structure. Their implementation
has some errors (ie: pg 460, aTime & timeInteger should match). Has
anyone actually fixed all these "typos" and gotten the simulation examples
to work?
As a new user of Smalltalk-80, I would appreciate your sharing any
experiences that you may have had with this example. Please reply
directly to me. If anyone else is interested in this problem and its
resolution, I can summarize and post corrections to this part of the
book. If these corrections already exist, I would appreciate your
assistance in pointing me to them. Thanks!
Jim Maley sdl@linus.UUCP (Steven D. Litvintchouk) (09/28/86)
Yes, I have gotten the simulation stuff in the blue book to work.
There are actually several typos, all of which should be more or less
obvious when you try to compile the code.
More serious is the fact that I had to play around with process
priorities to get the simulations to run. I don't have the code in
front of me, but as I recall, in the scheduler where it does
"Processor yield", the simulation processes never seem to run. I had
to change the code to fork them with the next higher priority, in order
to get them to run. I have never been able to decide whether that is
a bug in the blue book, or a bug in my Smalltalk implementation (I
have Softsmarts Smalltalk on my IBM PC/AT). I can mail you the code
of that too. I would be curious whether your implementation of
Smalltalk displays the same behavior.
Steven Litvintchouk
MITRE Corporation
Burlington Road
Bedford, MA 01730
Fone: (617)271-7753
ARPA: sdl@mitre-bedford
UUCP: ...{cbosgd,decvax,genrad,ll-xn,philabs,security,utzoo}!linus!sdl