[Bug nptl/21291] pthread cancellation fails when contending lock

["dimitri.staessens at ugent dot be" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=21291

--- Comment #16 from Dimitri Staessens <dimitri.staessens at ugent dot be> ---
I've also found this section of POSIX:

http://pubs.opengroup.org/onlinepubs/009695399/functions/xsh_chap02_09.html

You will find the following statement: 

"For functions in the "shall occur" list, a cancellation check must be
performed on every call regardless of whether, absent the cancellation, the
call would have blocked. For functions in the "may occur" list, a cancellation
check may be performed on some calls but not others; i.e., whether or not a
cancellation point occurs when one of these functions is being executed can
depend on current conditions."

in

http://pubs.opengroup.org/onlinepubs/009695399/functions/xsh_chap02_09.html

You will find that pthread_cond_timedwait() is in the "shall occur" list, so
this also states that this function always has to perform a cancellation check.

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