linux-kernel - Re: [PATCH] make setpriority POSIX compliant; introduce PRIO

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Message-Id: <1220282375.8426.69.camel@twins>
Date:	Mon, 01 Sep 2008 17:19:35 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Denys Vlasenko <dvlasenk@...hat.com>
Cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ulrich Drepper <drepper@...hat.com>
Subject: Re: [PATCH] make setpriority POSIX compliant; introduce
	PRIO_THREAD extension

On Mon, 2008-09-01 at 17:08 +0200, Peter Zijlstra wrote:
> On Mon, 2008-09-01 at 16:42 +0200, Denys Vlasenko wrote:
> > On Mon, 2008-09-01 at 16:12 +0200, Denys Vlasenko wrote:
> > > Patch is run tested. I will post test program etc as a reply.
> > 
> > Looks like Evolution word-wrapped the patch. Let me try again.
> 
> Patch looks simple enough, although a few comments below.
> Also, I guess the glibc people (Ulrich added to CC) might have an
> opinion.
> 
> > Signed-off-by: Denys Vlasenko <dvlasenk@...hat.com>
> > --

> > +		case PRIO_PROCESS:
> > +			if (who)
> > +				pid = find_vpid(who);
> > +			else {
> > +				pid = task_pid(current);
> > +				who = current->pid;
> > +			}
> > +			do_each_pid_thread(pid, PIDTYPE_PID, p) {
> > +				if (who == p->pid || who == p->tgid) {
> > +					error = set_one_prio(p, niceval, error);
> > +				}
> > +			} while_each_pid_thread(pid, PIDTYPE_PID, p);
> 
> I worry about destroying the return value here, support one thread
> fails, but the next succeeds, should we still report failure?

Ok - got fooled by this funny set_one_prio() function. It passes the old
error value and maintains it if no new error occurs (except for -ESRCH,
but I guess people know wth they're doing).

So I'll retract my concern.

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