Path: utzoo!utgpu!attcan!uunet!lll-winken!lll-tis!ames!amdahl!dlb!ardent!rap
From: rap@ardent.UUCP (Rob Peck)
Newsgroups: comp.sys.amiga
Subject: Re: CP/M
Keywords: PECK PROGRAMMERS GUIDE ERRATA
Message-ID: <440@ardent.UUCP>
Date: 28 Jul 88 18:13:02 GMT
Organization: Dana Computer, Inc., Sunnyvale, CA
Lines: 20

This is Errata4 for the Programmers Guide To The Amiga:

In listing 4.9, the main barchart program, the line

	WaitPort(w->UserPort);

should be moved down to become the first statement inside
the wait(1) loop.  The program apparently works without
this change, but has the unfortunate side effect of a
polling-the-UserPort-busy-wait-loop.  The fix makes the
program multi-tasking friendly.  So the resultant change
makes the loop:

	while(1)
	{
		WaitPort(w->UserPort);
		msg=(struct IntuiMessage *)GetMsg(w->UserPort);

	... and so on.

Rob Peck