linux-kernel - Re: [PATCH 3/3] Consolidate send_sigqueue and send_group

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Message-ID: <20080229113235.GA359@tv-sign.ru>
Date:	Fri, 29 Feb 2008 14:32:35 +0300
From:	Oleg Nesterov <oleg@...sign.ru>
To:	Roland McGrath <roland@...hat.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Pavel Emelyanov <xemul@...nvz.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/3] Consolidate send_sigqueue and send_group_sigqueue

On 02/28, Roland McGrath wrote:
>
> > > I'm not clear on how the already-queued case could ever happen.  Do we
> > > really need that check at all?  It shouldn't be possible for the timer to
> > > be firing when it's already queued, because it won't have been reloaded.
> > > It only reloads via do_schedule_next_timer after it's dequeued, or because
> > > a 1 return value said it never was queued.
> > 
> > This is true for the posix timers, but posix cpu timers case is different.
> > Note the run_posix_cpu_timers()->cpu_timer_fire().
> 
> Really?  It too reloads the CPU timer only when posix_timer_event returns
> nonzero, and otherwise expects do_schedule_next_timer to be called from
> signal dequeuing and call posix_cpu_timer_schedule to do the reload.

Ah. Thanks for correcting me! Looks like I forgot this code completely.
Indeed, check_thread/process_timers() removes cpu_timer_list from list.

Oleg.

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