src/lib/libc/include/spinlock.h, branch release/4.6.1

$Id$ -> $FreeBSD$

1999-08-28T00:22:10+00:00

Implement compile time debug support for spinlocks.

1998-06-09T08:28:49+00:00

Simplify the atomic lock prototype, removing the lock value.

Delete the unlock prototypes that are not required.

In a threaded library, expect the lock field to be declared volatile,

1998-05-05T21:46:30+00:00

so provide function prototypes that respect that, avoiding a gcc
warning that `volatile' is being thrown away.

Add a private (to libc, libc_r and libpthread) header file containing

1998-03-09T05:05:32+00:00

prototypes for the spinlock functions that will be used for thread locks.
libc will have stubs declared with weak symbols. libpthread and libc_r
will have functions that really do something.