Defect in XSH pthread_rwlockattr_destroy

[yyyyyyyy@xxxxxxx]

        Defect report from : Loic Domaigne , Personal Interest

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@ page 1125 line 35289 section pthread_rwlockattr_destroy comment 
{pthread_rwlockattr_init, issue EBUSY}

Problem:

Edition of Specification (Year): 2003

Defect code :  2. Omission

References are given against TC1.

In lines 35281-35282, it is said that:

| results are undefined if pthread_rwlockattr_init() is called
| specifying an already initialized attr attributes object. 

However, the standard doesn't define any optional checking for this error.

Action:

At l35289-35294 (§ERRORS), add:

The pthread_rwlockattr_init() may fail if:

[EBUSY]
The implementation has detected an attempt to reinitialize the 
read-write lock attribute object referenced by attr, a previously 
initialized, but not yet destroyed, attribute object.