Python ThreadPoolExecutor terminate all threads

问题

I am running a piece of python code in which multiple threads are run through threadpool executor. Each thread is supposed to perform a task (fetch a webpage for example). What I want to be able to do is to terminate all threads, even if one of the threads fail. For instance:

with ThreadPoolExecutor(self._num_threads) as executor:
    jobs = []
    for path in paths:
        kw = {"path": path}
        jobs.append(executor.submit(start,**kw))
    for job in futures.as_completed(jobs):
        result = job.result()
        print(result)
def start(*args,**kwargs):
    #fetch the page
    if(success):
        return True
    else:
        #Signal all threads to stop

Is it possible to do so? The results returned by threads are useless to me unless all of them are successful, so if even one of them fails, I would like to save some execution time of the rest of the threads and terminate them immediately. The actual code obviously is doing relatively lengthy tasks with a couple of failure points.

回答1:

If you are done with threads and want to look into processes, then this peace of code here looks very promising and simple, almost the same syntax as thread, but with the multiprocessing module.

When the timeout flag expires the process is terminated, very convenient.

import multiprocessing

def get_page(*args, **kwargs):
    # your web page downloading code goes here

def start_get_page(timeout, *args, **kwargs):
    p = multiprocessing.Process(target=get_page, args=args, kwargs=kwargs)
    p.start()
    p.join(timeout)
    if p.is_alive():
        # stop the downloading 'thread'
        p.terminate()
        # and then do any post-error processing here

if __name__ == "__main__":
    start_get_page(timeout, *args, **kwargs)

回答2:

You can try to use StoppableThread from func-timeout. But terminating threads is strongly discouraged. And if you need to kill a thread, you probably have a design problem. Look at alternatives: asyncio coroutines and multiprocessing with legal cancel/terminating functionality.

来源：https://stackoverflow.com/questions/62474014/python-threadpoolexecutor-terminate-all-threads