# ch6/example3.py

from multiprocessing import Process, current_process
import time
import os


def print_info(title):
    print(title)

    if hasattr(os, 'getppid'):
        print('Parent process ID: %s.' % str(os.getppid()))

    print('Current Process ID: %s.\n' % str(os.getpid()))

def f():
    print_info('Function f')

    pname = current_process().name
    print('Starting process %s...' % pname)
    time.sleep(1)
    print('Exiting process %s...' % pname)


if __name__ == '__main__':
    print_info('Main program')

    p = Process(target=f)
    p.start()
    p.join()

    print('Done.')