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From: Giacomo Tesio <giacomo@tesio.it>
To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net>
Subject: Re: [9fans] Privalloc(2) and rfork(RFPROC|RFMEM) (was: a pair nec bugs)
Date: Sat,  5 Sep 2015 20:42:41 +0200	[thread overview]
Message-ID: <CAHL7psHm+TE5PvWMP6XgQ5a=5C-c4xjGUN_G112oVPXp6g42pw@mail.gmail.com> (raw)
In-Reply-To: <b8520b52739689047e9d0543ae0a87c6@brasstown.quanstro.net>

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Nice example thanks.

May be my problem is that p is global in my case?

Giacomo
Il 05/Set/2015 18:50, "erik quanstrom" <quanstro@quanstro.net> ha scritto:

> by the way, the following program runs without asserting for me
> with or without the waits.
>
> - erik
>
> ---
>
> #include <u.h>
> #include <libc.h>
>
> void
> task(void **p)
> {
>         assert(*p == nil);
>         *p = (void*)(uintptr)getpid();
> }
>
> void
> spawn(void (*t)(void**), void **p)
> {
>         int pid;
>
>         switch(pid = rfork(RFMEM|RFPROC)){
>         case -1:
>                 sysfatal("spawn: rfork: %r");
>         case 0:
>                 t(p);
>                 exits("");
>         default:
>                 USED(pid);
>                 return;
>         }
> }
>
> void
> main(void)
> {
>         int i, k;
>         void **p;
>         Waitmsg *w;
>
>         p = privalloc();
>         k = 0;
>         for(i = 0; i < 1024; i++){
>                 spawn(task, p);
>                 for(k++; k > 16; k--){
>                         if((w = wait()) == nil)
>                                 break;
>                         free(w);
>                 }
>         }
>         exits("");
> }
>
>

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  reply	other threads:[~2015-09-05 18:42 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-09-05 14:03 Giacomo Tesio
2015-09-05 14:11 ` Giacomo Tesio
2015-09-05 15:27 ` erik quanstrom
2015-09-05 16:41   ` erik quanstrom
2015-09-05 18:42     ` Giacomo Tesio [this message]
2015-09-05 18:47       ` erik quanstrom
2015-09-05 23:03         ` Giacomo Tesio
2015-09-05 18:56       ` cinap_lenrek
2015-09-05 22:45 ` Charles Forsyth
2015-09-05 23:38   ` cinap_lenrek
2015-09-06 13:14     ` erik quanstrom
2015-09-06 14:12     ` Charles Forsyth
2015-09-06 15:02       ` erik quanstrom
2015-09-06 20:21         ` Charles Forsyth
2015-09-07  0:30           ` erik quanstrom
2015-09-07  9:38             ` Charles Forsyth
2015-09-07 11:59               ` Charles Forsyth
2015-09-06 18:21       ` cinap_lenrek
2015-09-06 20:27         ` Charles Forsyth

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