Python 进程池或者线程池 mul 如果任务出错，那么该线程或者进程就结束了，不会有任何提示？

```python
from concurrent.futures import ThreadPoolExecutor as Pool

def run():
1/0

pool = Pool(max_workers=3)
for i in range(3):
pool.submit(run)


from multiprocessing import Pool, freeze_support

if __name__ == '__main__':
freeze_support()

pool = Pool(3)

for i in range(3):
pool.apply_async(run,)
pool.close()
pool.join()
```

但是如果用传统的 multiprocessing,就会在主进程中抛出错误，为什么呢？