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* gh-84559: Change the multiprocessing start method default to `forkserver` ↵Gregory P. Smith2024-09-261-13/+13
| | | | | | | | (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>
* gh-120417: Add #noqa to used imports in the stdlib (#120421)Victor Stinner2024-06-131-1/+1
| | | | | 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.
* gh-84559: Remove the new multiprocessing warning, too disruptive. (#101551)Gregory P. Smith2023-02-031-27/+1
| | | | This reverts the core of #100618 while leaving relevant documentation improvements and minor refactorings in place.
* GH-84559: Deprecate fork being the multiprocessing default. (#100618)Gregory P. Smith2023-02-021-1/+28
| | | | | | | | 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.
* gh-90549: Fix leak of global named resources using multiprocessing spawn ↵Leo Trol2022-06-091-0/+14
| | | | | | (#30617) Co-authored-by: XD Trol <milestonejxd@gmail.com> Co-authored-by: Antoine Pitrou <pitrou@free.fr>
* bpo-39244: multiprocessing return default start method first on macOS (GH-18625)idomic2020-05-261-3/+4
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* bpo-33725: multiprocessing uses spawn by default on macOS (GH-13603)Victor Stinner2019-05-281-1/+6
| | | | On macOS, the multiprocessing module now uses the "spawn" start method by default.
* bpo-36888: Add multiprocessing.parent_process() (GH-13247)Thomas Moreau2019-05-201-0/+1
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* Simplify __all__ in multiprocessing (GH-6856)Derek B. Kim2018-07-111-4/+2
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* bpo-30296 Remove unnecessary tuples, lists, sets, and dicts (#1489)Jon Dufresne2017-05-181-1/+1
| | | | | | | | * 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())
* bpo-29762: More use "raise from None". (#569)Serhiy Storchaka2017-04-051-1/+1
| | | This hides unwanted implementation details from tracebacks.
* Issue #28779: multiprocessing.set_forkserver_preload() would crash the ↵Antoine Pitrou2016-12-101-1/+1
|\ | | | | | | forkserver process if a preloaded module instantiated some multiprocessing objects such as locks.
| * Issue #28779: multiprocessing.set_forkserver_preload() would crash the ↵Antoine Pitrou2016-12-101-1/+1
| | | | | | | | forkserver process if a preloaded module instantiated some multiprocessing objects such as locks.
* | Issue #28053: Applying refactorings, docs and other cleanup to follow.Davin Potts2016-09-091-2/+11
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* Issue #18999: Make multiprocessing use context objects.Richard Oudkerk2013-10-161-0/+348
This allows different parts of a program to use different methods for starting processes without interfering with each other.
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