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]
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