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From: Pietro Gagliardi <pietro10@mac.com>
Subject: Re: [9fans] Got thread experience?
Date: Thu, 25 Oct 2007 17:05:57 -0400
To: Fans of the OS Plan 9 from Bell Labs <9fans@cse.psu.edu>
Topicbox-Message-UUID: d97c82a6-ead2-11e9-9d60-3106f5b1d025

/* there are threads in plan 9 */
#include <u.h>
#include <libc.h>
#include <thread.h>

int killme = 0, i = 0, x = 0;

void thread_task(void *data)
{
    i++;
    if (i > 2000) {
        x++;
        killme = x > 200;
    }
}

/* threadmain() instead of main() - requires argc, argv */
void threadmain(int argc, char *argv[]) /* must use *argv[] - not  
**argv or argv[][] */
{
     int tid;

     tid = threadcreate(thread_task, 0, 2048); /* (function,  
argument, stack size) */
     if (tid < 0)
         sysfatal("could not create thread");
     while (!killme) {
         print(1, "waiting\n");
         sleep(2000); /* wait two seconds */
     }
     threadexitsall(0); /* use instead of exits() - with all suffix,  
terminates all threads */
}

On Oct 25, 2007, at 4:51 PM, erik quanstrom wrote:

>> So, those with experience with threading implementations on weird
>> real-time or embedded operating systems:
>>
>> Have you ever ran into a thread implementation where two threads
>> could *not* directly access each other's .bss (or equiv)/heap?
>>
>> i.e. have you ever encountered a scenario where sibling threads
>> actually had completely separate sets of page tables?
>
> under plan 9, don't we call those processes?
>
> that doesn't sound like any imbedded environment i've worked in.
> it's getting mighty fancy to have one set of pagetables. ;-)
>
> - erik
>