POSIX threads documentation

[Florian Weimer]

* Andreas Schwab:

> There is no need for that, all relevant pthread functions are available
> in libc (as stubs that forward to libpthread if loaded).

Is this guaranteed to be the case?  Which was the first libc version
to make that guarantee?

Unfortunately, pthread_once is missing from the stub list and can't be
added without degrading libstdc++ performance (because it uses
pthread_once to detect threading).

-- 
Florian Weimer                <fweimer@bfk.de>
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