import signal
import os
import time
import threading
 
def receive_signal(signum, stack):
    print 'Received:', signum
 
signal.signal(signal.SIGUSR1, receive_signal)
signal.signal(signal.SIGUSR2, receive_signal)
signal.signal(signal.SIGALRM, receive_signal)  # <-- THIS LINE ADDED
 
print 'My PID is:', os.getpid()
 
pid = os.getpid()
thread = threading.Thread(
  target=lambda: (
    time.sleep(10),
    os.kill(pid, signal.SIGUSR1)))
thread.start()
 
while True:
    print 'Waiting...'
    time.sleep(3)
 

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