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Re: (ITS#4943) tpool.c pause vs. finish

About context_reset() in pool_wrapper(): Yes, it works out.  Anyway I
completely lost that kfree functions may not lock ltp_mutex since it's
already locked (again unless they go active).  Will just document that
they may not call functions which take a pool argument anyway - they can
only use the context.  Will also insert various asserts about how
the pool should be used (pause/pause etc.)

Another detail:
tpool.c tracks task counts as 'long's, but pool_query() and
pool_backload() return them in 'int's.  Can use int counts
instead and set a max pending limit of INT_MAX - LDAP_MAXTHR.