3.1.2. Derefine event sequence

• Call list_t%remove_remove_and_reset() to
  • set bits%remove, which hides the task in check_ready() (task and nbor)
  • remove the task from the task list (it will remain in garbage bin while needed)
  • use the existing nbor list to set bits%init_nbors on nbors
  • now that the task is removed, call check_nbors() to see if nbors have become ready
  • move the task to the garbage bin
  • when the task is no longer needed (no longer is a member of an nbor list) the task is deallocated and deleted by list_t%garbage_remove()
• In task_mesg_t%unpack()
  • detect bits%remove and call list_t%remove_remove_and_reset()

This is identical to what is done on the owner rank, and is taken care of by the list_t%remove_and_reset() procedure.