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

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Date:	Thu, 28 Feb 2008 12:14:50 -0800 (PST)
From:	Roland McGrath <roland@...hat.com>
To:	Oleg Nesterov <oleg@...sign.ru>
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

> > 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.  I
must be missing something (having written the code I am easily deluded into
thinking I know what it's doing).


Thanks,
Roland
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