python:线程，多线程锁，多线程递归锁

#!usr/bin/env python# -*- coding:utf-8 -*-

__author__ = "Samson"

import threading,timedef run(n):    print("task", n)    time.sleep(2)    print("current thread:",threading.current_thread())#当前线程

t_obj = []#存线程实例start_time = time.time()for i in range(50):    t = threading.Thread(target=run,args=("t%s" %i,))    #t.setDaemon(True)#把当前线程设置为守护线程，必须在t.start()之前设置，作用为主线程将不会等待该子线程结束    t.start()    t_obj.append(t)print("total thread:",threading.active_count())#总线程数for t in t_obj:    t.join()#等待线程执行完print("%s" %(abs(start_time-time.time())))

多线程锁

#!usr/bin/env python# -*- coding:utf-8 -*-

__author__ = "Samson"

import threading,timedef run(n):    lock.acquire()#锁上    global num    num += 1    #time.sleep(1)#会变为单线程    lock.release()#解锁lock = threading.Lock()#创建锁num = 0t_obj = []#存线程实例for i in range(50):    t = threading.Thread(target=run,args=("t%s" %i,))    t.start()    t_obj.append(t)for t in t_obj:    t.join()print("%s" %num)

多线程递归锁

#!usr/bin/env python# -*- coding:utf-8 -*-

__author__ = "Samson"

import threading,timedef run():    lock.acquire()#锁上    res = run1()    res2 = run2()    lock.release()#解锁def run1():    lock.acquire()#锁上    global num    num += 1    lock.release()#解锁def run2():    lock.acquire()#锁上    global num    num += 1    lock.release()#解锁lock = threading.RLock()#创建递归锁num = 0for i in range(10):    t = threading.Thread(target=run)    t.start()print("Now:",threading.active_count())while threading.active_count() != 1:    print(threading.active_count())else:    print("%s" %num)

原文地址：https://www.cnblogs.com/cansun/p/8379709.html