linux-kernel - Re: [RFC,PATCH 2/2] posix timers: don't discard the signal if the timer was explicitly destroyed

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Message-ID: <20080422184831.GA105@tv-sign.ru>
Date:	Tue, 22 Apr 2008 22:48:31 +0400
From:	Oleg Nesterov <oleg@...sign.ru>
To:	Roland McGrath <roland@...hat.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Austin Clements <amdragon+kernelbugzilla@....edu>,
	Ingo Molnar <mingo@...e.hu>, john stultz <johnstul@...ibm.com>,
	Michael Kerrisk <mtk.manpages@...glemail.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC,PATCH 2/2] posix timers: don't discard the signal if the timer was explicitly destroyed

On 04/22, Roland McGrath wrote:
>
> > I am not sure this patch is really needed, please review.
> 
> I don't think this is worth doing.
> 
> > The previous patch adds the user-visible change. It is not clear to me why
> > should we cancel the pending signal sent by the timer after timer_delete().
> > Suppose the signal is blocked, pending, the user checks sys_rt_sigpending(),
> > destroys the timer and then doesn't see the signal.
> 
> So?  POSIX says it's unspecified what happens to such a signal,

Ah, good!

> so an
> application can't rely on it one way or the other.  I don't see any reason
> to complicate it further.

Agreed, please ignore this patch.

Thanks! I really hoped you will nack this, I hate the additional complications
too.

Oleg.

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