Date: Tue, 05 Dec 2000 09:22:55 -0700 From: Chuck Paterson <cp@bsdi.com> To: Julian Elischer <julian@elischer.org> Cc: Mike Smith <msmith@FreeBSD.org>, brian@FreeBSD.org, archie@FreeBSD.org, phk@FreeBSD.org, smp@FreeBSD.org Subject: Re: Netgraph and SMP Message-ID: <200012051622.eB5GMtm00562@berserker.bsdi.com> In-Reply-To: Your message of "Mon, 04 Dec 2000 13:40:08 PST." <200012042140.eB4Le9F01294@mass.osd.bsdi.com>
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Julian, A standard lock manager lock will provide the functionality Mike talks about below. Chuck Mike Smith wrote on: Mon, 04 Dec 2000 13:40:08 PST } }The simplest structure for this is a shared/exclusive lock }that supports intention; Terry would have ranted about this. (He would }have called it a SIX-lock, I think). } }In this model, you acquire the lock in 'shared' mode every time you enter }Netgraph, and release it when you leave. } }When you plan to make changes to Netgraph, you get the lock in }'exclusive' mode. 'Intention' comes in here; now that you are trying to }get the lock in exclusive mode, your intention is recorded and nobody }else can get it in 'shared' mode, so eventually all the users drain out }of Netgraph and you get the lock. } }This may sound simplistic, but given that you don't necessarily make }changes to Netgraph very often, this is quite likely more than adequate }for now. } To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-smp" in the body of the message
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