New submission from David Adam <zanc...@ucc.gu.uwa.edu.au>:
On Windows 10 (1909, build 18363.900) in 3.7.7 and 3.9.0b3, poll() on a
multiprocessing.Connection object can produce an exception:
--
import multiprocessing
def run(output_socket):
for i in range(10):
output_socket.send(i)
output_socket.close()
def main():
recv, send = multiprocessing.Pipe(duplex=False)
process = multiprocessing.Process(target=run, args=(send,))
process.start()
send.close()
while True:
if not process._closed:
if recv.poll():
try:
print(recv.recv())
except EOFError:
process.join()
break
if __name__ == "__main__":
main()
--
On Linux/macOS this prints 0-9 and exits successfully, but on Windows produces
a backtrace as follows:
File "mptest.py", line 17, in main
if recv.poll():
File "C:\Program
Files\WindowsApps\PythonSoftwareFoundation.Python.3.9_3.9.179.0_x64__qbz5n2kfra8p0\lib\multiprocessing\connection.py",
line 262, in poll
return self._poll(timeout)
File "C:\Program
Files\WindowsApps\PythonSoftwareFoundation.Python.3.9_3.9.179.0_x64__qbz5n2kfra8p0\lib\multiprocessing\connection.py",
line 333, in _poll
_winapi.PeekNamedPipe(self._handle)[0] != 0):
BrokenPipeError: [WinError 109] The pipe has been ended
----------
messages: 371748
nosy: zanchey
priority: normal
severity: normal
status: open
title: multiprocessing.Connection.poll raises BrokenPipeError on Windows
type: behavior
versions: Python 3.9
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue41008>
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