Victor Stinner schrieb am 15.04.2016 um 00:33: > 2016-04-15 0:22 GMT+02:00 Brett Cannon: >> And even if it was GIL-free you do run the risk of two dicts ending up at >> the same version # by simply mutating the same number of times if the >> counters were per-dict instead of process-wide. > > For some optimizations, it is not needed to check if the dictionary > was replaced, or you check it directly. So it doesn't matter to have > the same version with the same number of operations. > > For the use case of Yury's optimization, having a globally unique > version tag makes the guard much cheaper, and the guard must check > that the dictionary was not replaced.
How can that be achieved? If the tag is just a sequentially growing number, creating two dicts and applying one operation to the first one should give both the same version tag, right? Stefan _______________________________________________ Python-Dev mailing list Python-Dev@python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
