CVS log for src/sys/sys/once.h

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Revert "once(9): Assert sleepable in RUN_ONCE, unconditionally."

This would be nice but it'll break too many things for the moment.

once(9): Assert sleepable in RUN_ONCE, unconditionally.

Otherwise there's a good chance we'll never exercise many paths that
call RUN_ONCE when it's not sleepable, just because it's already been
done in a sleepable context before.

Sync with HEAD

add INIT_ONCE(9), FINI_ONCE(9) with changing once_t.

Welcome to 8.99.36

mark the ONCE_DECL() variables as __read_mostly to optimize cache placement

sync with head.

Sync with HEAD.

Sync with HEAD.

Sync with HEAD.

Rewrite once to use global locks and atomic ops to get rid of the
static simplelock initializer (and simplelock too).  The fastpath
is still lockless, so doesn't make a difference in terms of
performance.

Also fixes a hanging bug if the once routine returned an error.
It does not retry after an error occurs, as I can't really imagine
fruitful semantics for that.

Sync with HEAD.

sync with head

sync with HEAD

Sync with HEAD

sys/lock.h -> sys/simplelock.h

sync with head.

sync with head.

file once.h was added on branch yamt-lazymbuf on 2006-06-21 15:12:03 +0000

- tweak RUN_ONCE api to allow init_func returns an error.
- physio: handle failure of workqueue_create.

Sync with head.

Make sure that multiple header inclusion is done, it uses consistent names,
and it is around the whole code of the file, not parts of it.

Sync with HEAD. Here we go again...

sync with head.

file once.h was added on branch ktrace-lwp on 2005-11-10 14:12:12 +0000

file once.h was added on branch yamt-vop on 2005-11-02 11:58:11 +0000

add something like pthread_once().