New submission from Derek Frombach <neoredst...@gmail.com>:
When accessing Shared Memory Lists, occasionally the shared memory list will have a length of zero for only one line of code. Even know the length of the list is constant and greater than zero, when accessing this list, like say sml[0], python returns a ValueError complaining that sml is an empty list. As well, if you print out sml on the very next line in the exception handler, then you get a full length list, with no access issues whatsoever. This isn't a locking issue, since locks were acquired before writing to the lists, and released after writing. This is a shared memory list runtime access consistency issue. An Example of this Issue can be Seen Here: https://github.com/uofrobotics/RPLidarVidStream The issue is in the process_data function, only when smd, sma, smq, or sml are read from. ---------- components: Extension Modules, IO, Interpreter Core, asyncio, ctypes files: 20191203_194951.jpg messages: 357817 nosy: Derek Frombach, asvetlov, yselivanov priority: normal severity: normal status: open title: Shared Memory List Returns 0 Length type: crash versions: Python 3.8 Added file: https://bugs.python.org/file48757/20191203_194951.jpg _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue38973> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
