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Date: Mon, 28 Jan 2002 15:33:44 -0800 (PST)
From: Julian Elischer <julian@elischer.org>
To: arch@freebsd.org
Subject: KSE milestone 3 reached.
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In October or so I stated that Milestone 3 would be when a test program
could run several threads concurrently doing system calls 
(on one processor at the moment). 

I have reached that point however I need to 'back-fill' with the help of
others to fix things that I seem to have broken, for example
I think I've broken gdb's ability to control procrsses.

Anyhow,
The following program, when linked with a small library
(not supplied) yeilds the following expected result:

A non-library version of this program is available with the patches
at http://www.freebsd.org/~julian.


program:


#include <stdio.h>
#include <stdlib.h>
#include <ksethreads.h>
/*************************************************************
 * code for three separate threads. (so we can see if it works)
 *************************************************************/
static void
thread1_code(void *arg)
{
        for(;;) {
                sleep (1);
                write(1,".",1);
        } 
}
 
static void
thread2_code(void *arg)
{       
        for(;;) {
                sleep (3);
                write(1,"+",1);
        }
}
         
static void
thread3_code(void *arg)
{
        for(;;) {
                sleep (5);
                write(1,"=",1);
        }
}
 

                        
int main()
{
     
        /* set up global structures */
        TAILQ_INIT(&runqueue);

        /* define two threads to run, they are runnable but not yet
running */
        make_bg_thread(&thread1_code, 0, NULL);
        make_bg_thread(&thread2_code, 0, NULL);

 
        /* start two KSEs in different KSEGRPs */
        if (startkse(&first_kse)) {
                perror("failed to start KSE");
                exit(1);
        }
        
        /* and one which we will run ourself */
        makemainthread(&thread3_code, 0, NULL);
        thread3_code(NULL);
        return 0;
}

A more convenient interface would be easy to figure out.. this is just for
debugging..



result: (line wrap added by me)
# /ksetest/ksetest
..+..=.+...+.=..+...=+...+..=.+...+.=..+...=+...+..=.+...+.=..+...=+...+..=
.+...+.=..+...=+...+..=.+...+.=^C#D




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