测试GIL

test_gil.py

from threading import Thread

n = 100000000

def CountDown(n):
    while n > 0:
        n -= 1

def test1():
    CountDown(n)

def test2():
    t1 = Thread(target=CountDown, args=[n // 2])
    t2 = Thread(target=CountDown, args=[n // 2])
    t1.start()
    t2.start()
    t1.join()
    t2.join()


if __name__ == "__main__":
    test2()