import asyncio
import signal

waker = asyncio.Event()

@asyncio.coroutine
def hello_world():
    while True:
        print("Hello World!")
        # sleep for a second but wake up immediately upon SIGHUP
        try:
            yield from asyncio.wait_for(waker.wait(), timeout=1)
            print("Sleep was interrupted")
        except asyncio.TimeoutError:
            pass

def sig_wakeup():
    print("Waking")
    waker.set()
    waker.clear()
    print("Woke")

loop = asyncio.get_event_loop()
loop.add_signal_handler(signal.SIGHUP, sig_wakeup)
# Blocking call which returns when the hello_world() coroutine is done
try:
    loop.run_until_complete(hello_world())
finally:
    # otherwise complaints in remove_signal_handler
    loop.close()