风火编程--线程锁RLock(递归锁)的使用

线程锁使用示例

递归锁RLock

DEMO

# coding: utf-8
import random
import time
from threading import Thread, RLock
num1, num2 = 0, 0
lock = RLock()
st = time.time()

def downloader(num):
    """
    测试下载器加锁的作用
    使用方法: 打开锁内延时表示下载器加锁睡眠, 打开所外延时表示不加锁睡眠
    不加主动延时两条线程耗时15.1s, 不加锁两条线程耗时20.2s, 加锁后两条线程耗时30.3s
    """
    lock.acquire()
    num += 1
    time.sleep(1)  # 下载任务固有耗时
    # time.sleep(1)  # 主动延时一秒并加锁
    lock.release()
    # time.sleep(1)  # 主动延时一秒但不加锁
    return num

def work1():
    global num1
    while num1 < 10:
        num1 = downloader(num1)
        print("线程1 第{}次下载任务".format(num1))
    et = time.time()
    print("线程1 cost:", et-st)


def work2():
    global num2
    while num1 < 5:
        num2 = downloader(num2)
        print("线程2 第{}次下载任务".format(num2))

    et = time.time()
    print("线程2 cost:", et-st)


if __name__ == __main__:
    t_list = []


    t1 = Thread(target=work1)
    t2 = Thread(target=work2)
    t_list.append(t1)
    t_list.append(t2)
    for t in t_list:
        t.start()
    for t in t_list:
        t.join()
    print("total cost:", time.time()-st)