import threading
import signal
import time

TIMEOUT = 1.0
nsignals = 0

def burn_cpu():
    for i in range(10**3 * 3):
        pass

def sighandler(signum, frame):
    global nsignals
    nsignals += 1
    burn_cpu()

lock = threading.Lock()
lock.acquire()

start_time = time.monotonic()

old_handler = signal.signal(signal.SIGALRM, sighandler)
signal.setitimer(signal.ITIMER_REAL, 0.001, 0.001)

res = lock.acquire(timeout=TIMEOUT)

signal.setitimer(signal.ITIMER_REAL, 0, 0)
signal.signal(signal.SIGALRM, old_handler)

dt = time.monotonic() - start_time
print("acquire(timeout=%.1f) took %.1f seconds and got %s signals"
      % (TIMEOUT, dt, nsignals))

lock.release()