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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1999-08-28 00:22:10 +00:00
2002-09-28 00:25:32 +00:00