POSIX threads documentation

[Florian Weimer]

I'm looking for documentation on the non-portable aspects of the POSIX
threads implementation, but which are essential for library writers.
(Basically, I want to make my library thread-safe, without forcing
client code to link with -lpthread and the associated performance
penalty.)  In particular, I need to check if certain symbols which are
currently provided without -lpthread are guaranteed to be available to
non-threaded programs in the future.

Is there such a documentation available somewhere?

-- 
Florian Weimer                <fweimer@bfk.de>
BFK edv-consulting GmbH       http://www.bfk.de/
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