import time
from multiprocessing import Process, Pipe

def f(conn):
    while 1:
        if conn.poll(1): 
            conn.send('')
    conn.close()

parent_conn, child_conn = Pipe()
p = Process(target=f, args=(child_conn,))
p.start()

startTime = time.time()
parent_conn.send('123456789')
while 1:
    a = parent_conn.recv()
    if a != None:
        print  time.time() - startTime 
        break