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15 Commits

Author SHA1 Message Date
Gregory P. Smith b65f2cdfa7
gh-84559: Change the multiprocessing start method default to `forkserver` (GH-101556) 
Change the default multiprocessing start method away from fork to forkserver or spawn on the remaining platforms where it was fork.  See the issue for context.  This makes the default far more thread safe (other than for people spawning threads at import time... - don't do that!).

Co-authored-by: blurb-it[bot] <43283697+blurb-it[bot]@users.noreply.github.com>
Co-authored-by: Hugo van Kemenade <1324225+hugovk@users.noreply.github.com>
 2024-09-26 16:57:19 -07:00
Victor Stinner 6ae254aaa0
gh-120417: Add #noqa to used imports in the stdlib (#120421) 
Tools such as ruff can ignore "imported but unused" warnings if a
line ends with "# noqa: F401". It avoids the temptation to remove
an import which is used effectively.
 2024-06-13 16:14:50 +02:00
Gregory P. Smith d4c410f0f9
gh-84559: Remove the new multiprocessing warning, too disruptive. (#101551) 
This reverts the core of #100618 while leaving relevant documentation
improvements and minor refactorings in place.
 2023-02-03 15:20:46 -08:00
Gregory P. Smith 0ca67e6313
GH-84559: Deprecate fork being the multiprocessing default. (#100618) 
This starts the process. Users who don't specify their own start method
and use the default on platforms where it is 'fork' will see a
DeprecationWarning upon multiprocessing.Pool() construction or upon
multiprocessing.Process.start() or concurrent.futures.ProcessPool use.

See the related issue and documentation within this change for details.
 2023-02-02 15:50:35 -08:00
Leo Trol 30610d2837
gh-90549: Fix leak of global named resources using multiprocessing spawn (#30617) 
Co-authored-by: XD Trol <milestonejxd@gmail.com>
Co-authored-by: Antoine Pitrou <pitrou@free.fr>
 2022-06-09 18:55:12 +02:00
idomic db098bc1f0
bpo-39244: multiprocessing return default start method first on macOS (GH-18625) 2020-05-26 17:54:21 +03:00
Victor Stinner 17a5588740
bpo-33725: multiprocessing uses spawn by default on macOS (GH-13603) 
On macOS, the multiprocessing module now uses the "spawn" start
method by default.
 2019-05-28 16:02:50 +02:00
Thomas Moreau c09a9f56c0 bpo-36888: Add multiprocessing.parent_process() (GH-13247) 2019-05-20 21:37:05 +02:00
Derek B. Kim c40278ef95 Simplify __all__ in multiprocessing (GH-6856) 2018-07-11 19:22:28 +09:00
Jon Dufresne 3972628de3 bpo-30296 Remove unnecessary tuples, lists, sets, and dicts (#1489) 
* Replaced list(<generator expression>) with list comprehension
* Replaced dict(<generator expression>) with dict comprehension
* Replaced set(<list literal>) with set literal
* Replaced builtin func(<list comprehension>) with func(<generator
  expression>) when supported (e.g. any(), all(), tuple(), min(), &
  max())
 2017-05-18 07:35:54 -07:00
Serhiy Storchaka 5affd23e6f bpo-29762: More use "raise from None". (#569) 
This hides unwanted implementation details from tracebacks.
 2017-04-05 09:37:24 +03:00
Antoine Pitrou ebb39bcc04 Issue #28779: multiprocessing.set_forkserver_preload() would crash the forkserver process if a preloaded module instantiated some multiprocessing objects such as locks. 2016-12-10 17:16:17 +01:00
Antoine Pitrou cd2a201e5b Issue #28779: multiprocessing.set_forkserver_preload() would crash the forkserver process if a preloaded module instantiated some multiprocessing objects such as locks. 2016-12-10 17:13:16 +01:00
Davin Potts 5458647bb8 Issue #28053: Applying refactorings, docs and other cleanup to follow. 2016-09-09 18:03:10 -05:00
Richard Oudkerk b1694cf588 Issue #18999: Make multiprocessing use context objects. 
This allows different parts of a program to use different methods for
starting processes without interfering with each other.
 2013-10-16 16:41:56 +01:00