Date: Tue, 20 Dec 2005 11:04:05 -0800 From: Julian Elischer <julian@elischer.org> To: Luigi Rizzo <rizzo@icir.org> Cc: current@freebsd.org Subject: Re: td->td_critnest manipulations do not use atomic_add_int ? Message-ID: <43A855A5.6070809@elischer.org> In-Reply-To: <20051220032538.A33093@xorpc.icir.org> References: <20051220032538.A33093@xorpc.icir.org>
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Luigi Rizzo wrote: >as in the subject... i see that td->td_critnest (used to determine >whether a thread can be preempted or not) is manipulated using >plain ++ or -- instruction instead of the atomic_add_int(). > >I wonder if declaring it as volatile and possibly its >usage patterns are enough to make the two things equivalent >on all architectures. > > is td ever != curthread? >cheers >luigi >_______________________________________________ >freebsd-current@freebsd.org mailing list >http://lists.freebsd.org/mailman/listinfo/freebsd-current >To unsubscribe, send any mail to "freebsd-current-unsubscribe@freebsd.org" > >
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