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From: schwager@m.cs.uiuc.edu (Michael Schwager)
Newsgroups: comp.sys.amiga.programmer
Subject: General questions regarding Tasks
Summary: I have a few general questions about tasks
Keywords: tasks help questions seeking
Message-ID: <1991May24.160440.374@m.cs.uiuc.edu>
Date: 24 May 91 16:04:40 GMT
Organization: University of Illinois, Dept. of Comp. Sci., Urbana, IL
Lines: 65


Hi,
I'm looking for guidelines about using tasks within C programs.  C code
examples would help.  I've got Aztec C 5.0d, and their little beep.c
example only goes so far.  For example, I wonder: Can I call other
functions from within my task?  What do I need to be careful of (besides
changing system variables)?  Also, can I pass variables to a Task, like
this:

     CreateTask ("Name", 0, func3 (var0, var1, var2), BIGSTACK);

I'm getting random (I think) address error Guru's when I try to get too
fancy with Tasks.  Too fancy means: I want to call another function from
within it.

Here's a concrete example (something I'm trying now).  Given a program,
source code in at least two files.  The first file contains a coupla
functions:

************ file 0 ***********
func0 ()  /* main () or whatever */
{
blah;
}

func1 (number)
int number;
{
struct Task *myTCB;
     blah;
     myTCB = func2 ();
     loop:
     {
     blah;
     if (some_condition) DeleteTask (myTCB);
     }
}
************ file 0 ***********
The second, function(s) and a Task:
************ file 1 ***********
struct Task *
func2 ()
{
struct Task *someTCB;
     blah;
     someTCB = CreateTask ("Name", 0, func3, BIGSTACK);
     blah;
     return (someTCB);
}

func3 ()  /* It's a task! */
{
     blah;
     func1 (number);   /* Oooo... can I do this? Say func1() only has automagic
     	       	    variables.  */
     blah;
}
************ file 1 ***********

Thanks for the help.
-Mike Schwager                             | Machine: Amiga 500, 3 MB RAM/30 HD
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