Python多線程-2（線程共享全局變量）

 

 

例子：

from threading import Thread,Lock from time import sleep, ctime global_num = [] def func1(): global global_num for i in range(5): sleep(1)  #假設是最耗時的主過程
        lock.acquire()#兩個線程會最開始搶這個鎖，拿到鎖就會處於關鎖，執行后面的程序，其他線程執行處於監聽狀態，等待這個線程開鎖，再搶鎖
        global_num.append(1) print('-----%s---func1----:global_num=%s--------\n'%(ctime(),global_num)) lock.release() def func2(): global global_num for i in range(3): sleep(1) lock.acquire() global_num.append(2) print('-----%s---func2-----:global_num=%s========\n'%(ctime(),global_num)) lock.release() print('global_num=',global_num) lock = Lock() t1 = Thread(target=func1) t1.start() t2 = Thread(target=func2) t2.start() t1.join() t2.join() print('global_num=%s\n'%global_num)

　　python進階之多線程對同一個全局變量的處理