Date: Tue, 6 Jul 2004 15:55:49 +0600 From: "ngl" <ngl@ur.ru> To: "Tim Robbins" <tjr@freebsd.org> Cc: freebsd-standards@FreeBSD.org Subject: Re: Shared/exclusive (rw) locks Message-ID: <0eb601c4633f$6ac150c0$8501a8c0@spirit> References: <0e0401c46312$089eea10$8501a8c0@spirit><20040706050055.GA63647@cat.robbins.dropbear.id.au><0e3d01c46316$df50c7a0$8501a8c0@spirit><20040706054134.GB63647@cat.robbins.dropbear.id.au><0e6601c46324$d335afe0$8501a8c0@spirit> <20040706071732.GA64106@cat.robbins.dropbear.id.au>
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----- Original Message ----- From: "Tim Robbins" <tjr@freebsd.org> To: "ngl" <ngl@ur.ru> Cc: <freebsd-stable@freebsd.org> Sent: Tuesday, July 06, 2004 1:17 PM Subject: Re: Shared/exclusive (rw) locks > On Tue, Jul 06, 2004 at 12:45:27PM +0600, ngl wrote: > > That means, freebsd stable has no spin rwlocks ? > > Right. Reader-writer spinlocks would not be very useful in FreeBSD 4; because > only one thread can be running in the kernel at once Forgive for my importunity, but what about smp ? > , the only opportunity > you'd have to share reader locks would be if you slept while holding a > spinlock, which is a bad idea (and not permitted by FreeBSD 5 or Linux). > If you want -rwlocks, you'll have to use lockmgr() (which is a sleep lock). > > > Tim > _______________________________________________ > freebsd-stable@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-stable > To unsubscribe, send any mail to "freebsd-stable-unsubscribe@freebsd.org" Thanks, Nik
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