This directory contains files from the original UNIX/V7 distribution
(names of the form *.v7) and files that I have just produced by adding
my scheduler enhancements to the vanilla V7 files.

			*** WARNING ***

	Please note that this is NOT the system which I have tested
	and which we are currently running.  Our system is by now
	a great deal different from UNIX/V7.  It incorporates numerous
	bug fixes, other enhancements, and some parts of UNIX System III.
	Unfortunately, I am not presently at liberty to distribute
	all of the system.  Therefore, I have had to attempt to install
	just the scheduler enhancements in the vanilla V7 source.
	While I hope that I have done this correctly, I have no way to
	test this code.  Moreover, I would not advise anyone to run
	UNIX/V7 in its original form, without including several well-known
	bug fixes.  PLEASE BE CAREFUL when installing these files.

The file slp.c has no corresponding slp.c.v7, because it is more a rewrite
than a few simple changes.  All of the other files should have corresponding
*.v7 files, and the differences between them should be enclosed in ifdefs
using the symbol NEWSCHED.  The theory is that all files except slp.c could
be installed in a vanilla V7 system, and if NEWSCHED is not defined, everything
would operate normally.  Defining NEWSCHED and switching to the new version
of slp.c should install the new (enhanced) scheduler.

The following definitions should be added to param.h ...

#define NEWSCHED	1	/* include the hooks for new slp.c */

#ifdef NEWSCHED
#define MAXLEVEL	31	/* maximum scheduler level */
#define RTLEVEL		16	/* minimum real-time level */
#endif

There is a new system call SETBLEV in our system, which is described
in ../man/setblev.2.  In our system this call is entered through the
System III utssys system call.  Since some people getting this distribution
are not licensed for System III, I could not include the source for
utssys.c.  However, all of the real work in this call is done by the
SETBASLEV subroutine in slp.c.  You will only have to implement a system
entry point that picks up the arguments from user space and then calls
SETBASLEV.  The uses of the setblev call are described in ../cmd/README.