Date: Wed, 14 Jul 2004 13:37:36 -0700 (PDT) From: Don Lewis <truckman@FreeBSD.org> To: alfred@FreeBSD.org Cc: cvs-src@FreeBSD.org Subject: Re: cvs commit: src/sys/kern kern_event.c src/sys/sys eventvar.h Message-ID: <200407142037.i6EKba0E026064@gw.catspoiler.org> In-Reply-To: <20040714191118.GF95729@elvis.mu.org>
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On 14 Jul, Alfred Perlstein wrote: > * Doug Rabson <dfr@nlsystems.com> [040714 12:01] wrote: >> Seems to me that the best thing to do is to defer the psigio() to a >> taskqueue that will run in a simpler locking environment. > > I was thinking that, but I'm worried about "stale delivery", > perhaps we need to record the generation count (process start time) > in the sigio as well as the request sent, so that we don't send > a signal to the wrong process. This is already handled in the sigio infrastructure. Both struct proc and struct pgrp have a list of their potential sigio sources. When the process or process group goes away, the exit code disables sigio delivery.
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