if a pool instance used cross go routine, wg.Add() wg.Done() not work correctly as purpose

[rabbitHX]

example:
routine 1: wg.Add(10) then emit 10 go func wg.Done()
routine 2: wg.Add(2) then emit 2 func wg.Done()
when pool is Wait() ready, the result maybe composed by 8 routine 1 + 2 routine 2