python之递归锁【Rlock】详解编程语言

# 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)