# \#asyncio **URL:** https://discuss.python.org/tag/asyncio/43.md [Latest](https://discuss.python.org/latest.md) · [Categories](https://discuss.python.org/categories.md) · [Tags](https://discuss.python.org/tags.md) --- ## [Deprecate the iterator interface of async generator \`asend\`/\`athrow\` objects](https://discuss.python.org/t/deprecate-the-iterator-interface-of-async-generator-asend-athrow-objects/109137)
**Author:** [@kumaraditya303](https://discuss.python.org/u/kumaraditya303)\ **Replies:** 4\ **Last updated:** [September 19, 2026, 8:04pm UTC](https://discuss.python.org/t/deprecate-the-iterator-interface-of-async-generator-asend-athrow-objects/109137 "2026-09-19T20:04:44Z")
I propose to deprecate \_\_iter\_\_ and \_\_next\_\_ on the async\_generator\_asend and async\_generator\_athrow types, leaving them with \_\_await\_\_, send, throw and close like coroutines as described in PEP 525. The motivation is… --- ## [Semaphores for use with both threads and asyncio?](https://discuss.python.org/t/semaphores-for-use-with-both-threads-and-asyncio/109055)
**Author:** [@brittanyrey](https://discuss.python.org/u/brittanyrey)\ **Replies:** 4\ **Last updated:** [September 15, 2026, 1:31am UTC](https://discuss.python.org/t/semaphores-for-use-with-both-threads-and-asyncio/109055 "2026-09-15T01:31:38Z")
Hi! I’m currently adopting a program to use FT Python and went down a bit of a rabbit hole. The code bounds a shared resource with a semaphore, acquired from inside an asyncio event loop. With free threading, the code m… --- ## [Unified Concurrency Interface](https://discuss.python.org/t/unified-concurrency-interface/108763)
**Author:** [@AngellusMortis](https://discuss.python.org/u/AngellusMortis)\ **Replies:** 6\ **Last updated:** [August 26, 2026, 8:08pm UTC](https://discuss.python.org/t/unified-concurrency-interface/108763 "2026-08-26T20:08:07Z")
From my experience working on asyncio code and sync/non-asyncio code, probablythe most annoying part is actually building interfaces that support both. You get a bunch of aget or async\_get verus get calls. Async adapters… --- ## [A need for asyncio StreamWrite.awrite](https://discuss.python.org/t/a-need-for-asyncio-streamwrite-awrite/108302)
**Author:** [@dpgeorge](https://discuss.python.org/u/dpgeorge)\ **Replies:** 1\ **Last updated:** [July 28, 2026, 7:34am UTC](https://discuss.python.org/t/a-need-for-asyncio-streamwrite-awrite/108302 "2026-07-28T07:34:59Z")
A long time ago (September 2018) asyncio’s StreamWriter class gained awrite(data) and aclose() async methods. See But they never made it into a release and awrite() was merged into write() which became a hybrid sync/… --- ## [An eager way to set\_result on asyncio.Future?](https://discuss.python.org/t/an-eager-way-to-set-result-on-asyncio-future/106161)
**Author:** [@tarasko](https://discuss.python.org/u/tarasko)\ **Replies:** 28\ **Last updated:** [February 24, 2026, 8:55am UTC](https://discuss.python.org/t/an-eager-way-to-set-result-on-asyncio-future/106161 "2026-02-24T08:55:45Z")
When I set\_result on a Future that is awaited by some coroutine it doesn’t immediately wake up the coroutine. Instead all Future callbacks are scheduled using loop.call\_soon. Would it be possible to add some kind of Fut… --- ## [Overcome \*PoolExecutor class dangers](https://discuss.python.org/t/overcome-poolexecutor-class-dangers/106133)
**Author:** [@davidmcnabnz](https://discuss.python.org/u/davidmcnabnz)\ **Replies:** 3\ **Last updated:** [February 12, 2026, 6:54pm UTC](https://discuss.python.org/t/overcome-poolexecutor-class-dangers/106133 "2026-02-12T18:54:08Z")
In their present form, the \*PoolExecutor classes can be dangerous in high-pressure production environments, if used purely as documented. (For example, library calls in an asyncio environment which \[in\]directly cause DN… --- ## [Adding a low level wait for file descriptor](https://discuss.python.org/t/adding-a-low-level-wait-for-file-descriptor/51442)
**Author:** [@pcauchon](https://discuss.python.org/u/pcauchon)\ **Replies:** 2\ **Last updated:** [February 12, 2026, 5:04am UTC](https://discuss.python.org/t/adding-a-low-level-wait-for-file-descriptor/51442 "2026-02-12T05:04:23Z")
I had to integrate using asyncio a blocking library that uses sockets. Typical use case: async def handler(fd): loop = asyncio.get\_running\_loop() while True: await loop.wait\_readable(fd) x = blo… --- ## [Understanding asyncio.subprocess.Process garbage collection](https://discuss.python.org/t/understanding-asyncio-subprocess-process-garbage-collection/105973)
**Author:** [@eike](https://discuss.python.org/u/eike)\ **Replies:** 11\ **Last updated:** [February 3, 2026, 6:24pm UTC](https://discuss.python.org/t/understanding-asyncio-subprocess-process-garbage-collection/105973 "2026-02-03T18:24:47Z")
The documentation on asyncio.create\_subprocess\_exec claims: If the process object is garbage collected while the process is still running, the child process will be killed. However, I cannot get this to work. For exa… --- ## [How to cancel all tasks created within same TaskGroup](https://discuss.python.org/t/how-to-cancel-all-tasks-created-within-same-taskgroup/30215)
**Author:** [@JoakimJoensuu](https://discuss.python.org/u/JoakimJoensuu)\ **Replies:** 14\ **Last updated:** [December 8, 2025, 1:23am UTC](https://discuss.python.org/t/how-to-cancel-all-tasks-created-within-same-taskgroup/30215 "2025-12-08T01:23:12Z")
TaskGroup is quite new thing and I didn’t find functionality for easily cancelling all other tasks that might be running in the same task group. Only method TaskGroup object has is create\_task. Is this the right way to … --- ## [Test\_asyncio\_run\_without\_uncancel stuck in run\_forever(base\_events) asyncio loop](https://discuss.python.org/t/test-asyncio-run-without-uncancel-stuck-in-run-forever-base-events-asyncio-loop/104745)
**Author:** [@zuhu2195](https://discuss.python.org/u/zuhu2195)\ **Replies:** 1\ **Last updated:** [November 9, 2025, 12:51am UTC](https://discuss.python.org/t/test-asyncio-run-without-uncancel-stuck-in-run-forever-base-events-asyncio-loop/104745 "2025-11-09T00:51:14Z")
Hi, I am seeing the above test case test\_asyncio\_run\_without\_uncancel continuously running in run\_forever. The program runs fine when I try to place the breakpoint or when I add even a print statement, however it gets … --- ## [Why might asyncio.get\_running\_loop fail to find an extant event loop?](https://discuss.python.org/t/why-might-asyncio-get-running-loop-fail-to-find-an-extant-event-loop/104491)
**Author:** [@cookiedoughicecream](https://discuss.python.org/u/cookiedoughicecream)\ **Replies:** 3\ **Last updated:** [October 30, 2025, 8:07pm UTC](https://discuss.python.org/t/why-might-asyncio-get-running-loop-fail-to-find-an-extant-event-loop/104491 "2025-10-30T20:07:18Z")
(Apologies in advance if Python Help is the wrong forum, I wasn’t sure if I should post here or in Async-SIG.) In an API I’m working on, we are adding in statistics on registered webhooks so consumers can check the heal… --- ## [Is it ok to use async \_\_new\_\_?](https://discuss.python.org/t/is-it-ok-to-use-async-new/104579)
**Author:** [@rsdenijs](https://discuss.python.org/u/rsdenijs)\ **Replies:** 8\ **Last updated:** [October 28, 2025, 6:50pm UTC](https://discuss.python.org/t/is-it-ok-to-use-async-new/104579 "2025-10-28T18:50:56Z")
This example runs and linters don’t complain. Other than it being unexpected for a class constructor to behave like an async generator, is there anything fundamentally wrong here? import asyncio from collections.abc im… --- ## [Asyncio RLock - reentrant locks for async Python](https://discuss.python.org/t/asyncio-rlock-reentrant-locks-for-async-python/21509)
**Author:** [@robsdedude](https://discuss.python.org/u/robsdedude)\ **Replies:** 12\ **Last updated:** [October 22, 2025, 9:11pm UTC](https://discuss.python.org/t/asyncio-rlock-reentrant-locks-for-async-python/21509 "2025-10-22T21:11:02Z")
I’d like to re-open the discussion started here https://github.com/python/asyncio/issues/439, which requested reentrant locks to be added to asyncio. GvR argues that locks in eventloop-based concurrency are less used be… --- ## [Support async contextmanagers in contextlib.suppress](https://discuss.python.org/t/support-async-contextmanagers-in-contextlib-suppress/103954)
**Author:** [@PabloRuizCuevas](https://discuss.python.org/u/PabloRuizCuevas)\ **Replies:** 9\ **Last updated:** [September 30, 2025, 2:47am UTC](https://discuss.python.org/t/support-async-contextmanagers-in-contextlib-suppress/103954 "2025-09-30T02:47:21Z")
Now that Python supports chaining multiple context managers with a single with or async with statement, I think that it would be nice if contextlib.suppress would also support both sync and async context managers. from… --- ## [Add non-\`async\` \`try\_acquire\` method to \`asyncio.Lock\` to attempt locking immedietly from normal functions](https://discuss.python.org/t/add-non-async-try-acquire-method-to-asyncio-lock-to-attempt-locking-immedietly-from-normal-functions/102583)
**Author:** [@MaPePeR](https://discuss.python.org/u/MaPePeR)\ **Replies:** 7\ **Last updated:** [August 17, 2025, 1:53pm UTC](https://discuss.python.org/t/add-non-async-try-acquire-method-to-asyncio-lock-to-attempt-locking-immedietly-from-normal-functions/102583 "2025-08-17T13:53:16Z")
The asyncio.Lock class only provides an async def acquire() method, but because it is async its very hard to acquire the lock from a normal function, because acquire only locks when it is awaited, which is only possible … --- ## [Public proactor API?](https://discuss.python.org/t/public-proactor-api/102183)
**Author:** [@James\_E](https://discuss.python.org/u/James_E)\ **Replies:** 0\ **Last updated:** [August 12, 2025, 10:52pm UTC](https://discuss.python.org/t/public-proactor-api/102183 "2025-08-12T22:52:10Z")
Is there any access to the IOCP wait\_for\_handle functionality without going through the ugliness violation of an access to loop.\_proactor? I couldn’t find any calls to it in the main codebase outside of very tightly coup… --- ## [Error retrieving tasks: Failed to find the PyRuntime section in process 9026 on macOS platform (tried both libpython and python), while trying asyncio ps](https://discuss.python.org/t/error-retrieving-tasks-failed-to-find-the-pyruntime-section-in-process-9026-on-macos-platform-tried-both-libpython-and-python-while-trying-asyncio-ps/100311)
**Author:** [@cbuh](https://discuss.python.org/u/cbuh)\ **Replies:** 7\ **Last updated:** [August 1, 2025, 10:57am UTC](https://discuss.python.org/t/error-retrieving-tasks-failed-to-find-the-pyruntime-section-in-process-9026-on-macos-platform-tried-both-libpython-and-python-while-trying-asyncio-ps/100311 "2025-08-01T10:57:52Z")
Hello, I was following the example from What’s new in Python 3.14 — Python 3.14.0rc1 documentation and it failed with this error: aleksandrvin@Mac python-playground % sudo uv run python -m asyncio ps 9026 Error retriev… --- ## [Improve the context of asyncio slow log reporting](https://discuss.python.org/t/improve-the-context-of-asyncio-slow-log-reporting/83225)
**Author:** [@msukmanowsky](https://discuss.python.org/u/msukmanowsky)\ **Replies:** 1\ **Last updated:** [March 5, 2025, 6:33pm UTC](https://discuss.python.org/t/improve-the-context-of-asyncio-slow-log-reporting/83225 "2025-03-05T18:33:19Z")
Hi all, Wanted to kick off a discussion for an improvement to CPython and asyncio that I view as critical to enabling debugging for server environments. My issue is this: when debug mode is enabled for the Python event… --- ## [Add task pipeline to asyncio with capped parallelism and lazy input reading](https://discuss.python.org/t/add-task-pipeline-to-asyncio-with-capped-parallelism-and-lazy-input-reading/79292)
**Author:** [@missing-stardust](https://discuss.python.org/u/missing-stardust)\ **Replies:** 25\ **Last updated:** [February 15, 2025, 8:51am UTC](https://discuss.python.org/t/add-task-pipeline-to-asyncio-with-capped-parallelism-and-lazy-input-reading/79292 "2025-02-15T08:51:19Z")
Motivation I would like to propose adding a standard way to implement async data processing pipelines that are memory-friendly, enable input data stream being generated lazily or dynamically, and enable easy capping of p… --- ## [Add \`asyncio.console\` module to progamatically access the asyncio REPL](https://discuss.python.org/t/add-asyncio-console-module-to-progamatically-access-the-asyncio-repl/79919)
**Author:** [@provinzkraut](https://discuss.python.org/u/provinzkraut)\ **Replies:** 6\ **Last updated:** [February 10, 2025, 6:00pm UTC](https://discuss.python.org/t/add-asyncio-console-module-to-progamatically-access-the-asyncio-repl/79919 "2025-02-10T18:00:28Z")
What? Asyncio has a repl (python -m asyncio). I would like to propose to provide functionality analogous to the stdlib’s code.interact() that allows to programatically invoke this repl. The current limitations? The asyn… --- ## [Decorator to facilitate sync and async calls to one function](https://discuss.python.org/t/decorator-to-facilitate-sync-and-async-calls-to-one-function/78986)
**Author:** [@silmaril](https://discuss.python.org/u/silmaril)\ **Replies:** 6\ **Last updated:** [February 5, 2025, 6:21am UTC](https://discuss.python.org/t/decorator-to-facilitate-sync-and-async-calls-to-one-function/78986 "2025-02-05T06:21:47Z")
When writing function libraries for my colleagues, I often need to provide both async and sync methods for different use cases. I usually implement the functionality in an async method myfunction\_async() and add a sync … --- ## [High-performance Asyncio networking: sockets vs streams vs protocols](https://discuss.python.org/t/high-performance-asyncio-networking-sockets-vs-streams-vs-protocols/73420)
**Author:** [@NoahStapp](https://discuss.python.org/u/NoahStapp)\ **Replies:** 10\ **Last updated:** [December 23, 2024, 3:32pm UTC](https://discuss.python.org/t/high-performance-asyncio-networking-sockets-vs-streams-vs-protocols/73420 "2024-12-23T15:32:15Z")
I’ve working on writing high-performance asyncio network code and after having tried all three of the available APIs, I’m wondering if I’m writing my code incorrectly. The official docs suggest that working with socket … --- ## [Add asyncio monitoring hooks](https://discuss.python.org/t/add-asyncio-monitoring-hooks/26426)
**Author:** [@brettlangdon](https://discuss.python.org/u/brettlangdon)\ **Replies:** 27\ **Last updated:** [December 13, 2024, 2:31pm UTC](https://discuss.python.org/t/add-asyncio-monitoring-hooks/26426 "2024-12-13T14:31:46Z")
Similar previous discussion As an APM vendor (Datadog), I’d love to be able to provide deeper insights/metrics about the asyncio event loop for our customers. Some of the metrics I have been thinking about so far are: … --- ## [Concurrent asynchronous iteration](https://discuss.python.org/t/concurrent-asynchronous-iteration/70307)
**Author:** [@rusty-snake](https://discuss.python.org/u/rusty-snake)\ **Replies:** 3\ **Last updated:** [November 21, 2024, 3:17am UTC](https://discuss.python.org/t/concurrent-asynchronous-iteration/70307 "2024-11-21T03:17:18Z")
I want to iterate over an async iterable such that execution of the producer overlaps with execution of the consumer instead of them just merely alternating. Here is how I do it: from asyncio import CancelledError, Task… --- ## [Calling coroutines from sync code](https://discuss.python.org/t/calling-coroutines-from-sync-code/23027)
**Author:** [@srittau](https://discuss.python.org/u/srittau)\ **Replies:** 9\ **Last updated:** [October 7, 2024, 5:50pm UTC](https://discuss.python.org/t/calling-coroutines-from-sync-code/23027 "2024-10-07T17:50:06Z")
Suppose I want to call async code from a regular function and wait for its return. This function could be part of a library or could be far down a stack that is being iteratively converted to asyncio, so the fact that it… --- ## [Types for asynchronous generators too general](https://discuss.python.org/t/types-for-asynchronous-generators-too-general/64515)
**Author:** [@hurryabit](https://discuss.python.org/u/hurryabit)\ **Replies:** 2\ **Last updated:** [September 23, 2024, 10:05am UTC](https://discuss.python.org/t/types-for-asynchronous-generators-too-general/64515 "2024-09-23T10:05:15Z")
Although the following program successfully runs (and prints 42), neither pyright nor mypy accept it: import asyncio from collections.abc import AsyncGenerator async def gen() -\> AsyncGenerator\[int, None\]: yield 42… --- ## [Asyncio: when use \`call\_soon\`?](https://discuss.python.org/t/asyncio-when-use-call-soon/64525)
**Author:** [@guube](https://discuss.python.org/u/guube)\ **Replies:** 0\ **Last updated:** [September 20, 2024, 2:03pm UTC](https://discuss.python.org/t/asyncio-when-use-call-soon/64525 "2024-09-20T14:03:42Z")
Hi community! In asyncio internals or the internals of other modules that implement features on top of it, there is a lot of loop.call\_soon. Does anyone know when call\_soon should be used for callbacks, and when callbac… --- ## [Mixing async with operators for collection ABCs](https://discuss.python.org/t/mixing-async-with-operators-for-collection-abcs/64088)
**Author:** [@jace](https://discuss.python.org/u/jace)\ **Replies:** 3\ **Last updated:** [September 17, 2024, 7:20am UTC](https://discuss.python.org/t/mixing-async-with-operators-for-collection-abcs/64088 "2024-09-17T07:20:26Z")
Hello! I’m adding async support to code that makes liberal use of collection ABCs for IO-bound operations (eg: 'key' in cache). There doesn’t seem to be a good way to mix operators with async. await 'key' in cache won’t … --- ## [Add 2-state (boolean) asyncio synchronization primitive](https://discuss.python.org/t/add-2-state-boolean-asyncio-synchronization-primitive/61762)
**Author:** [@makukha](https://discuss.python.org/u/makukha)\ **Replies:** 8\ **Last updated:** [August 24, 2024, 11:14am UTC](https://discuss.python.org/t/add-2-state-boolean-asyncio-synchronization-primitive/61762 "2024-08-24T11:14:28Z")
UPD: A more general multi-valued State asyncio primitive with State(bool, False) as a special case: class State\[T\]: def \_\_init\_\_( self, values: Sequence\[T\] | type\[Enum\] | type\[bool\], default: T, … --- ## [Debugging \`asyncio\` execution time warnings when waiting for task wakeups](https://discuss.python.org/t/debugging-asyncio-execution-time-warnings-when-waiting-for-task-wakeups/59083)
**Author:** [@bmitc](https://discuss.python.org/u/bmitc)\ **Replies:** 0\ **Last updated:** [July 24, 2024, 9:26pm UTC](https://discuss.python.org/t/debugging-asyncio-execution-time-warnings-when-waiting-for-task-wakeups/59083 "2024-07-24T21:26:38Z")
Some prior discussions: Is asyncio.to\_thread always threadsafe? - Async-SIG - Discussions on Python.org Request for review of PySide6 (Qt for Python) and asyncio task prototype - Async-SIG - Discussions on Python.org T… [Next page](https://discuss.python.org/tag/asyncio/43.md?match_all_tags=true&page=1&tags%5B%5D=asyncio)