线程（三）：给线程加上锁

# -*- coding:utf-8 -*-


'''
在IDLE下运行

给线程加上保护锁,使线程在运行的时候不被其它事件抢占
生成 ---> 分配 ---> 获取 ---> 加锁 ---> 释放
其中分配和加锁都被隐含在流程当中

thread.allocate_lock() 生成锁
lock.acquire() 获取锁
lock.release() 释放锁

'''
import time
import thread

def loop(nloop,nsec,lock):
     print("loop%s start at :"%nloop,time.ctime())
     time.sleep(nsec)
     print("loop%s stop at :"%nloop,time.ctime())
     lock.release()     #释放锁，lock必须是一个已经获取的锁对象


def main():
    print ('all start at :',time.ctime())
    sleep_list = [4,2,2,3,1,2]
    lock_list = []

    for i in range(len(sleep_list)):
        lock = thread.allocate_lock()  #生成锁
        lock.acquire()  #获取锁
        lock_list.append(lock)

    for i in range(len(sleep_list)):
        thread.start_new_thread(loop,(i,sleep_list[i],lock_list[i]))

    time.sleep(max(sleep_list)+1)
    print ('all stop at :',time.ctime())

if __name__ =="__main__":
    main()