Date: Wed, 7 Jul 2004 17:05:57 +0300 From: Peter Pentchev <roam@ringlet.net> To: ngl <ngl@ur.ru> Cc: Tim Robbins <tjr@freebsd.org> Subject: Re: Shared/exclusive (rw) locks Message-ID: <20040707140557.GA60678@straylight.m.ringlet.net> In-Reply-To: <0eb601c4633f$6ac150c0$8501a8c0@spirit> References: <20040706071732.GA64106@cat.robbins.dropbear.id.au> <0eb601c4633f$6ac150c0$8501a8c0@spirit>
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--CE+1k2dSO48ffgeK Content-Type: text/plain; charset=windows-1251 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Tue, Jul 06, 2004 at 03:55:49PM +0600, ngl wrote: >=20 > ----- Original Message -----=20 > 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 >=20 >=20 > > 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 >=20 > Forgive for my importunity, but what about smp ? On FreeBSD 4.x, the kernel only ever runs on one CPU, the CPU that the system started on. The other CPU's are only used for scheduling userland processes. G'luck, Peter --=20 Peter Pentchev roam@ringlet.net roam@sbnd.net roam@FreeBSD.org PGP key: http://people.FreeBSD.org/~roam/roam.key.asc Key fingerprint FDBA FD79 C26F 3C51 C95E DF9E ED18 B68D 1619 4553 If wishes were fishes, the antecedent of this conditional would be true. --CE+1k2dSO48ffgeK Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.4 (FreeBSD) iD8DBQFA7ANF7Ri2jRYZRVMRAg9DAJ4ytU9IeWpgfKpECIYdohh9SFefDgCdF9WE E9fFSwiT0Ow3bBkyyFBjKtw= =Ml5Y -----END PGP SIGNATURE----- --CE+1k2dSO48ffgeK--
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