多线程等待

Posted 2020-11-10 lynn_chen

import threading,time
def run():
　　time.sleep(3)
　　print(‘哈哈哈‘)
start_time = time.time()
threads = [] #存放启动的5个线程
for i in range(5):
　　t = threading.Thread(target=run)
　　t.start()
　　# t.join()-------主线程等待子线程执行结束----此处放置等待启动一个进程等待一次，相当于串行
　　threads.append(t)

for lyl in threads: #主线程循环等待5个子线程执行结束
　　lyl.join()
end_time = time.time()
print(‘run_time..‘,end_time-start_time)