rx-rw-locking-20081024

rx-rw-locking-20081024

LICENSE BSD

rename RWLOCK_INIT to AFS_RWLOCK_INIT in order to maintain naming
consistency and to distinguish them from the new RWLOCK_INIT macros
being used in rx.

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This delta was composed from multiple commits as part of the CVS->Git migration.
The checkin message with each commit was inconsistent.
The following are the additional commit messages.
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LICENSE BSD

add rx/rx_internal.h as a dependency

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LICENSE BSD

define RWLOCK_xxx operations

replace MUTEX_xxx operations with RWLOCK_xxx when it is appropriate
to do so.  This improves concurrency on multi-processor systems.

make additional use of atomic operations