Python calls pipe.communicate () in a thread

Question

Using Python 2.6.1 on Mac OS X 10.6.2, I have the following problem:

I have a thread process (Thread class), and each of these threads has a channel (.Popen subprocess) something like:

 from threading import Thread

 cmd = "some_cmd"

 class Worker(Thread):
    def run(self):
       pipe = Popen(cmd,
        stdin=PIPE,
        stdout=PIPE,
        stderr=PIPE)

       out, err = pipe.communicate("some data")

The problem is that pipe.communicate () code is blocking. Interestingly, when I sent an interrupt (e.g. Ctrl-CKeyboardInterrupt) to the parent process, it unlocks.

Interestingly, when I use class Worker(multiprocessing.Process), the code works fine.

Any thoughts on why this is blocking - and how to fix it will be greatly appreciated.

Thank.

Answer 1

sys.exit() , ( ). , (, communication()), . Control-C , .

, , , . , .

Popen set() Popen.terminate() . , communicate() .

daemon thread?

Answer 2

, ( ) Unix; .