Event

EVent

from threading import Event, Thread
from time import sleep

s = None
e = Event()


def set_passwd():
    sleep(1)
    print("set passwd")
    global s
    s = 1
    e.set()
    print("set passwd=1 over")


t = Thread(target=set_passwd)
t.start()


print("passwd match begin")
e.wait()
if s == 1:
    print("success")
else:
    print("hit you")
t.join()

Lock

from threading import Lock, Thread
from time import sleep

a = b = c = d = e = f = 0

lock = Lock()


def value():
    while True:
        lock.acquire()
        if a != f:
            print("a=%d,f=%d" % (a, f))
        lock.release()


t = Thread(target=value, daemon=True)

t.start()

while a < 100:
    with lock:
        a += 1
        sleep(0.01)
        f += 1