Commit Graph

6 Commits

Author SHA1 Message Date
Andrew Svetlov 30b5d41fab
bpo-47039: Normalize repr() of asyncio future and task objects (GH-31950) 2022-03-17 03:03:09 +02:00
Guido van Rossum 602630ac18
bpo-46752: Add TaskGroup; add Task..cancelled(),.uncancel() (GH-31270)
asyncio/taskgroups.py is an adaptation of taskgroup.py from EdgeDb, with the following key changes:

- Allow creating new tasks as long as the last task hasn't finished
- Raise [Base]ExceptionGroup (directly) rather than TaskGroupError deriving from MultiError
- Instead of monkey-patching the parent task's cancel() method,
  add a new public API to Task

The Task class has a new internal flag, `_cancel_requested`, which is set when `.cancel()` is called successfully. The `.cancelling()` method returns the value of this flag. Further `.cancel()` calls while this flag is set return False. To reset this flag, call `.uncancel()`.

Thus, a Task that catches and ignores `CancelledError` should call `.uncancel()` if it wants to be cancellable again; until it does so, it is deemed to be busy with uninterruptible cleanup.

This new Task API helps solve the problem where TaskGroup needs to distinguish between whether the parent task being cancelled "from the outside" vs. "from inside".

Co-authored-by: Yury Selivanov <yury@edgedb.com>
Co-authored-by: Andrew Svetlov <andrew.svetlov@gmail.com>
2022-02-15 15:42:04 -08:00
Lidi Zheng 4482337dec
bpo-39764: Make Task.get_stack accept ag_frame (#18669)
Co-authored-by: blurb-it[bot] <43283697+blurb-it[bot]@users.noreply.github.com>
2020-03-02 14:45:54 +02:00
Alex Grönholm cca4eec3c0 bpo-34270: Make it possible to name asyncio tasks (GH-8547)
Co-authored-by: Antti Haapala <antti.haapala@anttipatterns.com>
2018-08-08 17:06:47 -04:00
Yury Selivanov 6370f345e1
bpo-32262: Fix codestyle; use f-strings formatting where necessary. (#4775) 2017-12-10 18:36:12 -05:00
Yury Selivanov a0c1ba608e Issue #28544: Implement asyncio.Task in C.
This implementation provides additional 10-20% speed boost for
asyncio programs.

The patch also fixes _asynciomodule.c to use Arguments Clinic, and
makes '_schedule_callbacks' an overridable method (as it was in 3.5).
2016-10-28 12:52:37 -04:00