K 10
svn:author
V 6
marcel
K 8
svn:date
V 27
2002-11-16T17:05:06.000000Z
K 7
svn:log
V 365
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.

END