[Bug nptl/18435] pthread_once hangs when init routine throws an exception

["msebor at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=18435

--- Comment #3 from Martin Sebor <msebor at redhat dot com> ---
Thanks for the reference to the POSIX issue.  I admit I was initially also
skeptical that this use case was intended to be supported by POSIX but became
convinced after reading the following quotes from the spec:

http://permalink.gmane.org/gmane.comp.lib.boost.devel/128855

It seems clear that POSIX not only intends to support such a use case (of
pthread_cleanup_push/pop) but even encourages exception-aware implementations
(referring to them as "the ideal solution").

With that in mind, though, I'm starting to think that a better solution than
the one proposed in my patch is actually to change pthread_cleanup_push/pop to
be usable with exceptions (i.e., in C code that calls into C++ code that
throws).

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