Date: Mon, 04 Jan 1999 23:58:54 -0700 From: Wes =?iso-8859-1?Q?Peters=D4?==?iso-8859-1?Q?=40=21=EA?= =?iso-8859-1?Q?=80?= =?iso-8859-1?Q?=EA?==?iso-8859-1?Q?=80=DD=E7?= =?iso-8859-1?Q?=805=EA?==?iso-8859-1?Q?=C0?==?iso-8859-1?Q?=EA?= <wes@softweyr.com> To: Terry Lambert <tlambert@primenet.com> Cc: Alfred Perlstein <bright@hotjobs.com>, hackers@FreeBSD.ORG Subject: Re: question about re-entrancy. Message-ID: <3691B82E.1D4E4B99@softweyr.com> References: <199901050315.UAA02641@usr05.primenet.com>
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Terry Lambert wrote: > > Alfred Perlstein wrote: > > > I'm a bit confused. I've been watching the discussions going on about > > SMP. The issue of kernel re-entrancy has been brought up many times. > > [Detailed answer elided...] > > It's a lot of work, but it's not rocket science. The most > complicated piece is the lock manager; to do it right, you need > a five dimensional vector relationship (an arc describing the > intersection of three two dimensional vectors: the lock list > held by a locking entity, the hierarchical list of lockable objects, > and the relationship between multiple locking entities within a > single process -- threads within a process). If you wish to see a working example of a microkernel using object locks, take a peek at the RTEMS kernel. It's quite portable, and supports SMP systems out of the box. See http://www.oarcorp.com/rtems/rtems.html for information. -- "Where am I, and what am I doing in this handbasket?" Wes Peters Softweyr LLC http://www.softweyr.com/~softweyr wes@softweyr.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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