Date: Wed, 22 Mar 2000 12:53:07 -0800 From: Greg Lehey <grog@lemis.com> To: Poul-Henning Kamp <phk@critter.freebsd.dk> Cc: Wes Peters <wes@softweyr.com>, Warner Losh <imp@village.org>, hackers@FreeBSD.ORG Subject: Re: splFoo() question Message-ID: <20000322125307.B2183@mojave.worldwide.lemis.com> In-Reply-To: <23423.953621217@critter.freebsd.dk>; from phk@critter.freebsd.dk on Tue, Mar 21, 2000 at 07:46:57AM %2B0100 References: <38D6B353.FA58BB15@softweyr.com> <23423.953621217@critter.freebsd.dk>
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On Tuesday, 21 March 2000 at 7:46:57 +0100, Poul-Henning Kamp wrote: > In message <38D6B353.FA58BB15@softweyr.com>, Wes Peters writes: >> Poul-Henning Kamp wrote: >>> >>> In message <200003182031.NAA97975@harmony.village.org>, Warner Losh writes: >>> >>>> I'd like to be able to do some simple spl locking in a driver that I'm >>>> writing. While I could go the splhigh() route, I'm concerned that >>>> spending lots of time at splhigh could cause problems, and some of my >>>> critical sections look to be very expensive. They only need >>>> protection against the card itself, not against the entire system. It >>>> just seems to be an overly large hammer. >>> >>> I miss this too. >> >> Semaphores? > > spl*() are semaphores. spl*() are interrupt lockouts. The difference is very evident in an SMP environment. Greg -- Finger grog@lemis.com for PGP public key See complete headers for address and phone numbers To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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