From owner-freebsd-hackers Mon Mar 20 16:43:43 2000 Delivered-To: freebsd-hackers@freebsd.org Received: from obie.softweyr.com (obie.softweyr.com [204.68.178.33]) by hub.freebsd.org (Postfix) with ESMTP id C13B537B8A5 for ; Mon, 20 Mar 2000 16:43:39 -0800 (PST) (envelope-from wes@softweyr.com) Received: from softweyr.com (Foolstrustidentd@obie.softweyr.com [204.68.178.33]) by obie.softweyr.com (8.8.8/8.8.8) with ESMTP id RAA04699; Mon, 20 Mar 2000 17:43:19 -0700 (MST) (envelope-from wes@softweyr.com) Message-ID: <38D6C5EB.E96A6514@softweyr.com> Date: Mon, 20 Mar 2000 17:44:27 -0700 From: Wes Peters Organization: Softweyr LLC X-Mailer: Mozilla 4.7 [en] (X11; U; FreeBSD 3.3-RELEASE i386) X-Accept-Language: en MIME-Version: 1.0 To: Warner Losh Cc: Guido van Rooij , hackers@FreeBSD.ORG Subject: Re: splFoo() question References: <20000320210008.A59405@gvr.gvr.org> <200003182031.NAA97975@harmony.village.org> <200003202057.NAA17486@harmony.village.org> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG Warner Losh wrote: > > In message <20000320210008.A59405@gvr.gvr.org> Guido van Rooij writes: > : perhaps we need some mutex mechanism? > > Yes. Right now the mutex mechanism that we have is blocking of > interrupts when the bit is set in the cpl. I guess I'm a little too > close to the mechanism and need to step back. > > You are right that I'm asking for a call that is approximately "block > my interrupt handler from running until I say it is ok." A more > generalized mutex/locking scheme is needed so that I can just grab a > mutex in my code and in my ISR and the right thing will just happen. A per-driver mutex, perhaps? This would save us from potential deadly embraces within a single driver, at least. -- "Where am I, and what am I doing in this handbasket?" Wes Peters Softweyr LLC wes@softweyr.com http://softweyr.com/ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message