linux-kernel - Re: Fix signalfd interaction with thread-private signals

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Message-ID: <Pine.LNX.4.64.0706191244090.16740@alien.or.mcafeemobile.com>
Date:	Tue, 19 Jun 2007 12:53:34 -0700 (PDT)
From:	Davide Libenzi <davidel@...ilserver.org>
To:	Oleg Nesterov <oleg@...sign.ru>
cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Nicholas Miell <nmiell@...cast.net>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Fix signalfd interaction with thread-private signals

On Tue, 19 Jun 2007, Oleg Nesterov wrote:

> On 06/19, Benjamin Herrenschmidt wrote:
> >
> > On Tue, 2007-06-19 at 13:14 +0400, Oleg Nesterov wrote:
> > 
> > > The commited "Fix signalfd interaction with thread-private signals"
> > > (commit caec4e8dc85e0644ec24aeb36285e1ba02da58cc) doesn't implement
> > > this.
> > 
> > Indeed, if you want what Davide described, you need to also change
> > signalfd side. The patch I did merely prevents another thread from
> > dequeuing somebody else private signals.
> 
> Yes I see, but why do we need this change? Yes, we can dequeue SIGSEGV
> from another thread. Just don't do it if you have a handler for SIGSEGV?

I believe it can be confusing to have private signals dequeued from 
another thread. The kernel expect those to be dequeued by the target 
thread.


- Davide


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