linux-kernel - Re: [patch 2/13] signal/timer/event fds v7

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Message-ID: <Pine.LNX.4.64.0703191718020.3733@alien.or.mcafeemobile.com>
Date:	Mon, 19 Mar 2007 17:20:20 -0700 (PDT)
From:	Davide Libenzi <davidel@...ilserver.org>
To:	Oleg Nesterov <oleg@...sign.ru>
cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: [patch 2/13] signal/timer/event fds v7 - signalfd core ...

On Tue, 20 Mar 2007, Oleg Nesterov wrote:

> On 03/19, Davide Libenzi wrote:
> >
> > +struct signalfd_lockctx {
> > +	struct task_struct *tsk;
> > +	struct sighand_struct *sighand;
> > +	unsigned long flags;
> > +};
> 
> signalfd_lockctx is "private" to signalfd_lock/signalfd_unlock. But lk->sighand
> is used only by signalfd_lock(). I'd suggest to remove it.

Ack



> > +void signalfd_deliver(struct task_struct *tsk, int sig)
> > +{
> > +	struct sighand_struct *sighand = tsk->sighand;
> > +	struct signalfd_ctx *ctx, *tmp;
> > +
> > +	list_for_each_entry_safe(ctx, tmp, &sighand->sfdlist, lnk) {
> > +		/*
> > +		 * We use a negative signal value as a way to broadcast that the
> > +		 * sighand has been orphaned, so that we can notify all the
> > +		 * listeners about this. Remeber the ctx->sigmask is inverted,
> > +		 * so if the user is interested in a signal, that corresponding
> > +		 * bit will be zero.
> > +		 */
> > +		if (sig < 0) {
> > +			if (ctx->tsk == tsk) {
> > +				ctx->tsk = NULL;
> > +				list_del_init(&ctx->lnk);
> > +				wake_up(&ctx->wqh);
> > +			}
> > +		} else if (sig > 0) {
> > +			if (!sigismember(&ctx->sigmask, sig))
> > +				wake_up(&ctx->wqh);
> > +		}
> > +	}
> > +}
> 
> I tried to avoid this comment, but can't help myself :)

Added BUG_ON() and using "else".



- Davide


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