thread pool helpers

[tridge at samba.org]

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Hi Jerry,

> For what it's worth Solaris 8 - 10 has been the most problematic
> system wrt to pthread bugs (in the Likewise codebase).  And in
> those cases, new OS patches would resolve the issues.  I don't
> remember any major pthread issues on Linux.

Interesting. Do you use setreuid() or equivalent to change uid in a
process that also uses threads?

I really should read your code .... starting a git clone now ...

Cheers, Tridge