Commit Graph

20 Commits

Author SHA1 Message Date
James Webber a12e8ffb49
gh-106075: add `asyncio.taskgroups.__all__` to `asyncio.__all__` (#106090)
Co-authored-by: Kumar Aditya <59607654+kumaraditya303@users.noreply.github.com>
2023-06-26 07:54:03 +00:00
Andrew Svetlov f537b2a4fb
bpo-46771: Implement asyncio context managers for handling timeouts (GH-31394)
Example:

async with asyncio.timeout(5):
    await some_task()

Will interrupt the await and raise TimeoutError if some_task() takes longer than 5 seconds.

Co-authored-by: Guido van Rossum <guido@python.org>
2022-03-10 08:05:20 -08:00
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
Serhiy Storchaka 8a62887dfb
bpo-42582: Remove asyncio._all_tasks_compat(). (GH-23664)
It was used to implement now removed asyncio.Task.all_tasks().
2020-12-06 18:54:33 +02:00
Kyle Stanley cc2bbc2227
bpo-32309: Implement asyncio.to_thread() (GH-20143)
Implements `asyncio.to_thread`, a coroutine for asynchronously running IO-bound functions in a separate thread without blocking the event loop. See the discussion starting from [here](https://github.com/python/cpython/pull/18410#issuecomment-628930973) in GH-18410 for context.

Automerge-Triggered-By: @aeros
2020-05-18 20:03:28 -07:00
Yury Selivanov 6758e6e12a
bpo-38242: Revert "bpo-36889: Merge asyncio streams (GH-13251)" (#16482)
See https://bugs.python.org/issue38242 for more details
2019-09-29 21:59:55 -07:00
Andrew Svetlov 23b4b697e5 bpo-36889: Merge asyncio streams (GH-13251)
https://bugs.python.org/issue36889
2019-05-27 12:56:22 -07:00
Andrew Svetlov 0baa72f4b2
bpo-34622: Extract asyncio exceptions into a separate module (GH-9141) 2018-09-11 10:13:04 -07:00
Yury Selivanov 416c1ebd98
bpo-32610: Fix asyncio.all_tasks() to return only pending tasks. (GH-7174) 2018-05-28 17:54:02 -04:00
Yury Selivanov 02a0a19206
bpo-32314: Implement asyncio.run() (#4852) 2017-12-14 09:42:21 -05:00
Yury Selivanov 6370f345e1
bpo-32262: Fix codestyle; use f-strings formatting where necessary. (#4775) 2017-12-10 18:36:12 -05:00
Victor Stinner 4271dfd781
bpo-32154: Remove asyncio.selectors (#4605)
* Remove asyncio.selectors and asyncio._overlapped symbols from the
  namespace of the asyncio module
* Replace "from asyncio import selectors" with "import selectors"
* Replace "from asyncio import _overlapped" with "import _overlapped"

asyncio.selectors was added to support Python 3.3, which doesn't have
selectors in its standard library, and Python 3.4 in the same code
base. Same rationale for asyncio._overlapped. Python 3.3 reached its
end of life, and asyncio is no more maintained as a third party
module on PyPI.
2017-11-28 15:19:56 +01:00
Victor Stinner 8c1a4a2326 Issue #23046: Expose the BaseEventLoop class in the asyncio namespace 2015-01-06 01:03:58 +01:00
Victor Stinner be0a2d767c Fix asyncio.__all__: export also unix_events and windows_events symbols
For example, on Windows, it was not possible to get ProactorEventLoop or
DefaultEventLoopPolicy using "from asyncio import *".
2014-07-18 12:44:25 +02:00
Victor Stinner f951d28ac8 asyncio: sync with Tulip, add a new asyncio.coroutines module 2014-06-29 00:46:45 +02:00
Victor Stinner 915bcb0111 Issue #20400: Merge Tulip into Python: add the new asyncio.subprocess module
* Add a new asyncio.subprocess module
* Add new create_subprocess_exec() and create_subprocess_shell() functions
* The new asyncio.subprocess.SubprocessStreamProtocol creates stream readers
  for stdout and stderr and a stream writer for stdin.
* The new asyncio.subprocess.Process class offers an API close to the
  subprocess.Popen class:

  - pid, returncode, stdin, stdout and stderr attributes
  - communicate(), wait(), send_signal(), terminate() and kill() methods

* Remove STDIN (0), STDOUT (1) and STDERR (2) constants from base_subprocess
  and unix_events, to not be confused with the symbols with the same name of
  subprocess and asyncio.subprocess modules
* _ProactorBasePipeTransport.get_write_buffer_size() now counts also the size
  of the pending write
* _ProactorBaseWritePipeTransport._loop_writing() may now pause the protocol if
  the write buffer size is greater than the high water mark (64 KB by default)
2014-02-01 22:49:59 +01:00
Victor Stinner 128ee220e2 asyncio: Don't export BaseEventLoop, BaseSelectorEventLoop nor
BaseProactorEventLoop

Import them from submodules if you really need them.
2014-01-25 22:22:18 +01:00
Victor Stinner 8dffc456d7 Update asyncio from the Tulip project
Major changes:

- StreamReader.readexactly() now raises an IncompleteReadError if the
  end of stream is reached before we received enough bytes, instead of
  returning less bytes than requested.

- Unit tests use the main asyncio module instead of submodules like events

- _UnixWritePipeTransport now also supports character devices, as
  _UnixReadPipeTransport. Patch written by Jonathan Slenders.

- Export more symbols: BaseEventLoop, BaseProactorEventLoop,
  BaseSelectorEventLoop, Queue and Queue sublasses, Empty, Full
2014-01-25 15:32:06 +01:00
Guido van Rossum 5969128a86 asyncio: Add support for running subprocesses on Windows with the IOCP event loop (Richard Oudkerk). 2013-10-30 14:52:03 -07:00
Guido van Rossum 27b7c7ebf1 Initial checkin of asyncio package (== Tulip, == PEP 3156). 2013-10-17 13:40:50 -07:00