線程（三）：給線程加上鎖

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


'''
在IDLE下運行

給線程加上保護鎖,使線程在運行的時候不被其它事件搶佔
生成 ---> 分配 ---> 獲取 ---> 加鎖 ---> 釋放
其中分配和加鎖都被隱含在流程當中

thread.allocate_lock() 生成鎖
lock.acquire() 獲取鎖
lock.release() 釋放鎖

'''
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()     #釋放鎖，lock必須是一個已經獲取的鎖對象


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()  #生成鎖
        lock.acquire()  #獲取鎖
        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()