Defect in XBD 4.10 Memory Synchronization

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        Defect report from : Alexander Terekhov , IBM

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@ page 100 line 3120-3128 section 4.10 Memory Synchronization comment {2}

Problem:

Defect code :  3. Clarification required

I think that pthread_cond_signal() and pthread_cond_broadcast()
should be REMOVED from the list of functions that synchronize 
memory with respect to other threads because IMO applications 
just cannot have any useful dependencies on pthread_cond_signal() 
and/or pthread_cond_broadcast() w.r.t memory synchronization/
visibility. The predicate is fully protected by the associated 
mutex with lock/unlock calls plus pthread_cond_wait() and 
pthread_cond_timedwait() providing execution and memory 
synchronization to the full extent.


Action:

Remove pthread_cond_signal() and pthread_cond_broadcast() 
from the list of functions that synchronize memory with 
respect to other threads.