Yury Selivanov <yseliva...@gmail.com> added the comment: Guido,
This is another feature for native coroutines that Nathaniel proposes for 3.7. Here's a summary (this issue has too many messages): 1. It adds a new mechanism to detect un-awaited coroutines (i.e. when a user forgets to use await). 2. To enable the mechanism, which is disabled by default, a "sys. set_unawaited_coroutine_tracking_enabled()" function needs to be called by a framework. 3. "sys.get_unawaited_coroutines()" returns a list of not-yet-awaited native-coroutine objects that were created since the previous call to "get_unawaited_coroutines()". 4. In Trio, the APIs are designed to accept *coroutine functions*. So in Trio, a user either writes "await coro()" or passes "coro" to a Trio API. Nathaniel wants Trio to check periodically if there are any un-awaited coroutines and raise an error, which should improve Trio usability. 5. Another potential user of this new functionality is pytest-asyncio. It can use the API to warn the user that a test created some coroutines that were never awaited. 6. asyncio/tornado/curio/twisted will not be able to use this API. 7. Effectively, the previously merged origin-tracking API (the one with which we replaced set_coroutine_wrapper) achieves the same goal. The only downside is that the warning won't be raised until GC. On other interpreters like PyPy it can take a while before a coroutine gets GCed. 8. The patch adds two pointers to native coroutines objects to maintain a doubly-linked list of them. 9. The performance impact is visible in micro-benchmarks, but is unlikely be visible in real applications. Still, it's about 3-4% slowdown for both generators and coroutines. 10. The PR itself is in a good shape, although I'll still make a review pass if you approve this feature to go in 3.7. What do you think? ---------- _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue30491> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
