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 objection {1}

Problem:

Defect code :  2. Omission

pthread_once() is missing from the list of functions 
that synchronize memory with respect to other threads.


Action:

Add pthread_once() to the list of functions 
that synchronize memory with respect to other 
threads.