我使用multiprocessing.process生成3个进程并等待它们完成。如果其中一个失败，那么我想停止所有其他进程以及主程序。但是当我使用sys.exit时，执行只是停止进程而不是主程序。这是代码的片段。
proc1=process(function1)
proc2=process(function2)
proc3=process(function3)
proc1.start
proc2.start
proc3.start
proc1.join
proc2.join
proc3.join
。 。
我在函数1,2和3中运行一些任务。我在每个函数中都有一个条件来检查任务的返回码，如果返回码不成功那么我想停止proc1，proc2和proc3并停止执行主程序。当我在函数内部执行sys.exit时，它就是从那个进程中出来而不是主程序。
答案 0 :(得分：2)
为此，您需要在工作进程和主进程之间进行通信。可能最简单的方法是使用multiprocessing.Event。
在启动流程之前，创建一对multiprocessing.Event。为他们提供有意义的名称，例如stop_main和stop_workers。为了便于携带，我们应该将这些Event添加到为Process目标提供的参数中。
当工作进程希望主程序退出时，应调用stop_main.set()。工作进程还应定期调用stop_workers.is_set()，并在返回True时退出。
在主进程启动所有工作程序后，它应该继续轮询stop_main.is_set()。如果返回True，则应调用stop_workers.set()，join工作人员并退出。
<强>更新
编辑使其更短，并希望它能在ms-windows上运行。
一个例子：
import multiprocessing as mp
import time
def worker(num, sw, sm):
if num == 5:
print('This is worker', num)
time.sleep(1)
print('Worker', num, 'signalling main program to quit')
sm.set()
while not sw.is_set():
print('This is worker', num)
time.sleep(0.7)
else:
print('Worker', num, 'signing off..')
if __name__ == '__main__':
stop_worker = mp.Event()
stop_main = mp.Event()
workers = [mp.Process(target=worker, args=(n, stop_worker, stop_main))
for n in range(1, 6)]
for w in workers:
w.start()
while not stop_main.is_set():
time.sleep(1)
print('MAIN: Received stop event')
print('MAIN: Sending stop event to workers')
stop_worker.set()
for c, w in enumerate(workers, start=1):
w.join()
print('worker', c, 'joined')
它的运行方式如下：
This is worker 1 This is worker 2 This is worker 3 This is worker 4 This is worker 5 This is worker 2 This is worker 3 This is worker 1 This is worker 4 Worker 5 signalling main program to quit This is worker 5 This is worker 2 This is worker 3 This is worker 1 This is worker 4 This is worker 5 MAIN: Received stop event MAIN: Sending stop event to workers Worker 3 signing off.. Worker 1 signing off.. Worker 2 signing off.. worker 1 joined worker 2 joined worker 3 joined Worker 4 signing off.. worker 4 joined Worker 5 signing off.. worker 5 joined
答案 1 :(得分：0)
这是一个解决方案。一旦-v var=${i: -1}退出，您将失去与已启动进程的所有通信，但是对于我的matplotlib用例来说，这没关系。只需关闭窗口，或者如上所述，关闭外壳即可。