[nondet]thread_pool_property(?Name, 
?Property)- options(Options)
 - Thread creation options for this pool
 - free(Size)
 - Number of free slots on this pool
 - size(Size)
 - Total number of slots on this pool
 - members(ListOfIDs)
 - ListOfIDs is the list or threads running in this pool
 - running(Running)
 - Number of running threads in this pool
 - backlog(Size)
 - Number of delayed thread creations on this pool