Defect in XSH 2.9.5.3 Thread Cancelation Cleanup Handlers

[yyyyyyyy@xxxxxxxxxx]

        Defect report from : Alexander Terekhov , IBM

(Please direct followup comments direct to yyyyyyyyyyyyyy@xxxxxxxxxxxxx)

@ page 57 line 2342-2343 section 2.9.5.3 Thread Cancelation Cleanup Handlers 
comment {alt-2.9.5.3-2003-04-04}

Problem:

Defect code :  3. Clarification required

The standard says: 

<quote source=2342-2343>

The thread invokes the cancelation cleanup handler with cancelation
disabled until the last cancelation cleanup handler returns.

</quote>

To me, it doesn't say anything "specific enough" with respect to the 
VALUES of cancelability TYPE and STATE. Also, I don't quite follow 
"until the last cancellation cleanup handler returns" clause above. 
Surely, we do NOT want cancellation be enabled ("by default", I mean; 
enabling-it-for-something...catching-and-finalizing-pthread_cancel_e-
exception aside for a moment ;-) ) in our TSD destructors (and no 
matter whether thread termination was caused by the cancel delivery 
or it is "just normal" termination -- either explicit or implicit 
call to pthread_exit()).


Action:

Remove completely 2342-2343 wording quoted above and apply the 
proposed changes (additions) that are stated in the defect reports
"alt-pthread_cancel-2003-04-04" and "alt-pthread_exit-2003-04-04".