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.