PROBLEM: (72100, 74961, 75971, 77080,
          77288, 79588) (PATCH ID: OSF445-112)
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Threaded applications which make extensive use of synchronization objects
(mutexes, condition variables) may encounter performance and scaling
regressions when run on some EV6 SMP machines.  Customers encountering
these regressions may observe negative scaling, decreased application
throughput and increased CPU utilitzation, as the number of EV6 CPUs
is increased.  This version of DECthreads contains changes to the
implementation of synchronization objects and thread scheduling around
those objects to improve performance on all SMP systems.  No functional
or interface changes were made.