Defect in XSH Threads

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        Defect report from : Ulrich Drepper , Red Hat, Inc.

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@ page 55 line 2267 section Threads objection {ud-cp-1}

Problem:

Edition of Specification (Year): 2003

Defect code :  2. Omission

fsync() is among the cancellation points.  The fdatasync() function isn't 
although it is very similar.

Action:

Add fdatasync() to list of cancellation points.