mmacy 68b801ac97 Add simple preempt safe epoch API
Read locking is over used in the kernel to guarantee liveness. This API makes
it easy to provide livenes guarantees without atomics.

Includes epoch_test kernel module to stress test the API.

Documentation will follow initial use case.

Test case and improvements to preemption handling in response to discussion
with mjg@

Reviewed by:	imp@, shurd@
Approved by:	sbruno@
2018-05-10 17:55:24 +00:00
..
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			       bmake
			       *****

This directory contains a port of the BSD make tool (from NetBSD).
Since 1993 I have run it on AIX, BSDi, Darwin, FreeBSD, HP-UX, IRIX,
Linux, Minix, OSF, Solaris, SunOS and even UTS.
Others have run it on many more systems.

Currently each release is tested on NetBSD, FreeBSD, Solaris and Linux.

Since 2003 bmake switched to a date based version (first was 20030714)
which generally represents the date it was last merged with NetBSD's
make.  Since then, NetBSD's make is imported within a week of any
interesting changes, so that bmake tracks it very closely.

Building
========

The preferred way to bootstrap bmake is::

	./bmake/boot-strap

there are a number of args - most of which get passed to configure,
eg.
::

	./bmake/boot-strap --prefix=/opt

see the boot-strap script for details.

For folk that hate to read anything, since 20121212 you can also use
the GNU standard process of::

	./configure; make; make install

To make much use of bmake you will need the bsd.*.mk macros or my
portable *.mk macros which are included with bmake since 20121212
and separately available from
http://www.crufty.net/ftp/pub/sjg/mk.tar.gz
which will be links to the latest versions.

Porting
=======

If you encounter a system that bmake does not build or work on *out of
the box*, I welcome patches.
If you can provide access to a suitable machine - even better.

More info can be found at http://www.crufty.net/help/sjg/bmake.htm

--sjg <sjg@crufty.net>