Just to be clear, the problem is leaving this subprocess open (you'll get a new terminal window appear) when trying to close down Maya. Doing so causes Maya to hang.
On 22 February 2017 at 10:08, Marcus Ottosson <[email protected]> wrote: > Hi all, > > I’m struggling to understand why my Maya session deadlocks when leaving a > subprocess open whilst listening to its stdout in a thread. > > The thread is deamonised, and without the thread then closing down Maya > works well. > > I’ve narrowed down the problem into this. > > import sysimport timeimport subprocessimport threading > > child = """ > import sys > > while True: > line = sys.stdin.readline() > sys.stdout.write("child: Input: %s" % line) > > """ > > popen = subprocess.Popen( > ["c:/python27/python.exe", "-u", "-c", child], > stdout=subprocess.PIPE, > stdin=subprocess.PIPE > ) > def listen(): > def _listen(out): > time.sleep(1) # Give subprocess a second to launch > print("parent: Listening..") > for line in iter(out.readline, b""): > sys.stdout.write(line) > print("parent: Closing..") > out.close() > > thread = threading.Thread(target=_listen, args=[popen.stdout]) > thread.daemon = True > thread.start() > def send(text): > popen.stdin.write(text + "\n") > popen.stdin.flush() > > listen() > send("hello") > > This is on Windows, I haven’t tested other OSs yet, but would expect > different results there. I suspect the issue is an open handle to stdout, > but would still have expected the thread to forcefully exit and not make a > fuzz. > > Any ideas? > > -- > *Marcus Ottosson* > [email protected] > -- *Marcus Ottosson* [email protected] -- You received this message because you are subscribed to the Google Groups "Python Programming for Autodesk Maya" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/python_inside_maya/CAFRtmOA_eDnLSUr_v89jxS6Qa%3DUNEGc0eF%2B0ygHbqTo-E03Sgw%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
