function 
    /usr/local/lib/janet/spork/tasker.janet  on  line  206 , column  1 
    
    (spawn-executors  tasker  &opt  qnames  workers-per-queue  pre-task  post-task )
    Start  a  number  of  executors  to  run  tasks.  Tasks  can  be  added  to  a  
    queue  by  calling  queue-task.  A  single  tasker  object  can  make  
    multiple  calls  to  spawn-executors.