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From: ncmagel@ndsuvax.UUCP (ken magel)
Newsgroups: net.micro.mac
Subject: need for coroutines on Mac
Message-ID: <141@ndsuvax.UUCP>
Date: Sun, 6-Oct-85 12:14:23 EDT
Article-I.D.: ndsuvax.141
Posted: Sun Oct  6 12:14:23 1985
Date-Received: Sat, 12-Oct-85 15:52:01 EDT
Organization: North Dakota State University, Fargo N.D.
Lines: 11


      Object oriented languages such as Smalltalk ( I have used only the 
Methods implementation for the IBM PC) usually are implemented with a command
loop which cycles through a ring of objects, sending a message to each in turn
if that object is marked as active.  The object can excute whatever it wishes
and send messages to other objects before sending a message back to the object
which implements the command loop.  The command loop object then continues its
cycle.  I have heard that Neon on the Macintosh does the same thing.  This is 
not the same as coroutines and a program in a higher level language could do 
the same thing.