linux-kernel - Re: [PATCH 2/3] signals: introduce SIGQUEUE

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Date:	Tue, 20 May 2008 19:24:40 -0700 (PDT)
From:	Roland McGrath <roland@...hat.com>
To:	Oleg Nesterov <oleg@...sign.ru>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Austin Clements <amdragon+kernelbugzilla@....edu>,
	Ingo Molnar <mingo@...e.hu>, john stultz <johnstul@...ibm.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Michael Kerrisk <mtk.manpages@...glemail.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] signals: introduce SIGQUEUE_CANCELLED

> Introduce SIGQUEUE_CANCELLED flag. If it is set, the pending signal should be
> ignored and collect_signal() should return 0.

Acked-by: Roland McGrath <roland@...hat.com>

> Note that the new flag is completely orthogonal to SIGQUEUE_PREALLOC, and it
> can be set without ->siglock held.

I think to keep things easier to understand, we should say the rule is that
touching q->flags is always controlled by siglock when q is on a queue.
Before it's queued or after it's been dequeued (i.e. list_empty(&q->list)
with siglock held), then the "owner" of the struct sigqueue of course needs
noone's siglock.


Thanks,
Roland
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