python之递归锁Rlock

Posted 2020-09-30

# 递归锁:就是一把锁中还有一把小锁，比如学校的大门口有一个大锁，学校里的
#每个教室也有一把小锁,以后所有的锁都用rlock就可以了，不要用lock，尤其是多层锁的时候，必须要用递归锁
import threading
import time

def run1():
    print("grab the first part data")
    lock.acquire()
    global num1
    num1 += 1
    lock.release()
    return num1

def run2():
    print("grab the second part data")
    lock.acquire()
    global num2
    num2 += 1
    lock.release()
    return num2

def run3():
    lock.acquire()
    res1 = run1()
    print("--------between run1 and run2-------")
    res2 = run2()
    lock.release()
    print("函数run1--->",res1,"函数run2--->",res2)

if __name__ == ‘__main__‘:
    num1 = 0
    num2 = 0
    lock = threading.RLock()
    for i in range(5):
        t = threading.Thread(target=run3)
        t.start()

while threading.active_count() != 1:
    print("剩余的线程数;[%s]" %threading.active_count())
else:
    print("all thread is down")
    print(num1,num2)