Marcel Moolenaar f8739dd5f9 Implement the lock with a cmpxchg instruction instead of a xchg. ... Both are atomic, but the cmpxchg has memory ordering hints. We give this acquire semantics. NOTE: The unlock in libc_r is implemented by a "normal" assign statement. This is not correct on ia64 due to the memory ordering characteristics of the architecture. We need release semantics for an unlock.		2002-11-16 17:05:06 +00:00
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alpha	$Id$ -> $FreeBSD$	1999-08-28 00:22:10 +00:00
amd64	Change #include "DEFS.h" to <machine/asm.h>.	2001-10-25 01:30:54 +00:00
i386	Change #include "DEFS.h" to <machine/asm.h>.	2001-10-25 01:30:54 +00:00
ia64	Implement the lock with a cmpxchg instruction instead of a xchg.	2002-11-16 17:05:06 +00:00