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 _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue41008> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com