New submission from Lorenzo Persichetti <lpersiche...@gmail.com>:
According to the documentation of the multiprocessing.Value() class available here https://docs.python.org/3.6/library/multiprocessing.html#multiprocessing.Value Operations like += which involve a read and write are not atomic. So if, for instance, you want to atomically increment a shared value it is insufficient to just do counter.value += 1 Assuming the associated lock is recursive (which it is by default) you can instead do with counter.get_lock(): counter.value += 1 What happens is that when running the following snippet import multiprocessing manager = multiprocessing.Manager() value = manager.Value('i', 0) value.get_lock() the result is AttributeError: 'ValueProxy' object has no attribute 'get_lock' ---------- assignee: docs@python components: Documentation, Library (Lib), Windows messages: 334070 nosy: Lorenzo Persichetti, docs@python, paul.moore, steve.dower, tim.golden, zach.ware priority: normal severity: normal status: open title: get_lock() method is not present for Values created using multiprocessing.Manager() versions: Python 3.6 _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue35786> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
