Richard Oudkerk added the comment: On 22/03/2013 3:19pm, Charles-François Natali wrote: > The _flag is checked without any lock held: although it won't be a > problem with CPython, a standard memory model (e.g. Java's one) > doesn't guarantee that reading _flag outside of the lock will return > the value most recently written to it (because of caching/hoisting, or > store buffers/invalidate queues at CPU level). > > So in short, if wait() is called by a thread shortly after another > thread clear()ed it, the former thread might very well read _flag == > True (while the later just set it to False) and return erroneously.
I was under the impression that dict access (and therefore attribute access for "simple" objects) was guaranteed to be atomic even in alternative implementations like Jython and IronPython. Is this not a language guarantee? ---------- _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue17389> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
