code: def self_send():
      start_event.wait()
      comm = MPI.COMM_WORLD
      rank = comm.Get_rank()
      comm.Send([send_msg, MPI.INT], dest=rank, tag=0)
  
imports: import sys
  import threading
  from mpi4py import MPI
label_desc: Use image node_id 1 for calling a global function with example usage: self_send() without return types