 [det]thread_pool_create(+Pool, 
+Size, +Options)
[det]thread_pool_create(+Pool, 
+Size, +Options)wait 
option of
thread_create_in_pool/4 
and the backlog option described below. Options 
are passed to thread_create/3, 
except for
infinite. 
Otherwise it must be a non-negative integer. Using backlog(0) 
will never delay thread creation for this pool.
The pooling mechanism does not interact with the detached 
state of a thread. Threads can be created both detached and 
normal and must be joined using thread_join/2 
if they are not detached.