code: def f(self, id):
      while not self.stop:
          self.alive[id] = os.getpid()
          try:
              time.sleep(SHORTSLEEP)
          except OSError:
              pass
  
file_path: cpython/Lib/test/fork_wait.py
imports: import os, time, unittest
  import threading
  from test import support
  from test.support import threading_helper
  import warnings
label_desc: Use image node_id 3 for calling the ForkWait obj's underlying member method code with example usage: obj.f(id) without return types