gistfile1.txt

import os
import threading


locks = lock, rlock = threading.Lock(), threading.RLock()


with lock, rlock:
  child = os.fork()
  if child:
    raise SystemExit(0)
  if lock.locked():
    print(lock, 'is locked')
  if rlock._is_owned():
    print(rlock, 'is locked')