Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: utzoo!mnetor!seismo!mcnc!rti!dg_rtp!meissner
From: meissner@dg_rtp.UUCP (Michael Meissner)
Newsgroups: comp.unix.wizards
Subject: Re: Why "u." and not "u->" ?  (I'm reading Bach book)
Message-ID: <1950@dg_rtp.UUCP>
Date: Fri, 22-May-87 10:54:00 EDT
Article-I.D.: dg_rtp.1950
Posted: Fri May 22 10:54:00 1987
Date-Received: Sat, 23-May-87 15:53:17 EDT
References: <626@vixie.UUCP> <3568@spool.WISC.EDU> <500@rust.DEC.COM> <8047@utzoo.UUCP>
Reply-To: meissner@dg_rtp.UUCP (Michael Meissner)
Organization: Data General (Languages @ Research Triangle Park, NC.)
Lines: 20

In article <8047@utzoo.UUCP> henry@utzoo.UUCP (Henry Spencer) writes:
		/* somebody else */
> > I worked on a system were kernel mode ran unmapped. We were unable to
> > use u. and therefore had to solve some very difficult problems. We even
> > considered copying u areas to a fixed location at every context switch.
> 
> Don't laugh, it's been done.  I'm told it works okay, if a bit slowly.

Another way to work around this, would be to use the macro processor (cpp):

	struct ... *u_ptr;

	#define	u	(*u_ptr)

When the kernel does a context swap, it mearly changes the pointer u_ptr
to the new u area.
-- 
	Michael Meissner, Data General	Uucp: ...mcnc!rti!dg_rtp!meissner

It is 11pm, do you know what your sendmail and uucico are doing?