linux-kernel - Re: [PATCH 1/3] do

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Message-ID: <20080331200758.GA115@tv-sign.ru>
Date:	Tue, 1 Apr 2008 00:07:58 +0400
From:	Oleg Nesterov <oleg@...sign.ru>
To:	Roland McGrath <roland@...hat.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] do_wait reorganization

On 03/31, Roland McGrath wrote:
>
> I think it should look like this:
> 
>     {
> 	    int ret = eligible_child(type, pid, options, p);
> 	    if (ret <= 0)
> 		    return ret;
> 
> 	    if (p->exit_state == EXIT_DEAD)
> 		    return 0;
> 
> 	    /*
> 	     * We don't reap group leaders with subthreads.
> 	     */
> 	    if (p->exit_state == EXIT_ZOMBIE && !delay_group_leader(p))
> 		    return wait_task_zombie(p, options, infop, stat_addr, ru);
> 
> 	    /*
> 	     * It's stopped or running now, so it might
> 	     * later continue, exit, or stop again.
> 	     */
> 	    *retval = 0;
> 
> 	    if (task_is_stopped_or_traced(p))
> 		    return wait_task_stopped(p, options, infop, stat_addr, ru);
> 
> 	    return wait_task_continued(p, options, infop, stat_addr, ru);
>     }

I think you are right.

(BTW, you moved the "options & WHATEVER" checks into wait_task_xxx(),
 I think this really makes the code more readable and maintainable).

Oleg.

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