Python: while KeyboardInterrupt is forwarded to multiprocessing child process?

Question

I have following test code executed on Windows:

import multiprocessing
import time

def child() :
  while True :
    time.sleep( 2 )

if __name__ == '__main__' :
  multiprocessing.Process( target = child ).start()
  while True :
    time.sleep( 1 )

If i press Ctrl-C while it's working, i see two KeyboardInterrupt exceptions - one for sleep( 1 ) and one for sleep( 2 ). How it's happens that keyboard interrupt in main process is forwarded to child process? They are processes after all, not threads :(.

These kind of things depend on the underlying OS, so you should also tag what OS you are running this on. — Keith, Jan 01 '13 at 22:33

score 2 · Accepted Answer · 2013-01-01T22:06:22.193

2

The KeyboardInterrupt exception is thrown when a process catches the SIGINT signal which indicates a keyboard interrupt (pressing ctrl+c).

In Unix/Linux systems the SIGINT signal is sent to the entire foreground process group which includes the parent process and its child processes.

edited Jan 01 '13 at 22:06

answered Jan 01 '13 at 22:01

But i'm running this code on Windows. Is it same logic with Ctrl-C on windows even without `SIGTERM`? – grigoryvp Jan 01 '13 at 22:21
Unsure. You should add the tag for your specific version of Windows... it might be relevant to the answer you get. Also, the signal is `SIGINT` (keyboard interrupt) _not_ `SIGTERM`. – Jan 01 '13 at 22:28

Python: while KeyboardInterrupt is forwarded to multiprocessing child process?

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