René's URL Explorer Experiment


Title: gh-123471: Make concurrent iteration over itertools.accumulate thread-safe by eendebakpt · Pull Request #144486 · python/cpython · GitHub

Open Graph Title: gh-123471: Make concurrent iteration over itertools.accumulate thread-safe by eendebakpt · Pull Request #144486 · python/cpython

X Title: gh-123471: Make concurrent iteration over itertools.accumulate thread-safe by eendebakpt · Pull Request #144486 · python/cpython

Description: We use a critical section similar to the approach in #132814. Note: the accumulate has mutable internal state lz->initial and lz->total. With some refactoring we can replace the lz->init pointer with a C int (where atomics can be used), but the lz->total remains a pointer that is mutated on each iteration. A side benefit of the refactoring would be that a decref in accumulate_dealloc is avoided and visit in accumulate_traverse. I decided not to include the refactoring in this PR (it would involve some churn), but if a core dev feels otherwise I will include it. Issue: gh-123471

Open Graph Description: We use a critical section similar to the approach in #132814. Note: the accumulate has mutable internal state lz->initial and lz->total. With some refactoring we can replace the lz->init p...

X Description: We use a critical section similar to the approach in #132814. Note: the accumulate has mutable internal state lz->initial and lz->total. With some refactoring we can replace the lz-&a...

Opengraph URL: https://github.com/python/cpython/pull/144486

X: @github

direct link

Domain: github.com

route-pattern/:user_id/:repository/pull/:id/files(.:format)
route-controllerpull_requests
route-actionfiles
fetch-noncev2:0409dac2-ce59-68a5-d652-e8ef922141b5
current-catalog-service-hashae870bc5e265a340912cde392f23dad3671a0a881730ffdadd82f2f57d81641b
request-idB8C6:22F661:A72361:E427D7:6A57E120
html-safe-nonce49eed65b9a185d96dd2ac76b27ecf705bc0e1eaa90c9723ad3c0833690ad03e1
visitor-payloadeyJyZWZlcnJlciI6IiIsInJlcXVlc3RfaWQiOiJCOEM2OjIyRjY2MTpBNzIzNjE6RTQyN0Q3OjZBNTdFMTIwIiwidmlzaXRvcl9pZCI6Ijg5MjM3MjMxMTgyNjg2Mzc0NzIiLCJyZWdpb25fZWRnZSI6ImlhZCIsInJlZ2lvbl9yZW5kZXIiOiJpYWQifQ==
visitor-hmac3d4e5ed3553af945a447ffee1ea761ac5d0b0fd402589a991f1eca9920ffaeee
hovercard-subject-tagpull_request:3247342423
github-keyboard-shortcutsrepository,pull-request-list,pull-request-conversation,pull-request-files-changed,copilot
google-site-verificationApib7-x98H0j5cPqHWwSMm6dNU4GmODRoqxLiDzdx9I
octolytics-urlhttps://collector.github.com/github/collect
analytics-location///pull_requests/show/files
fb:app_id1401488693436528
apple-itunes-appapp-id=1477376905, app-argument=https://github.com/python/cpython/pull/144486/files
twitter:imagehttps://avatars.githubusercontent.com/u/883786?s=400&v=4
twitter:cardsummary_large_image
og:imagehttps://avatars.githubusercontent.com/u/883786?s=400&v=4
og:image:altWe use a critical section similar to the approach in #132814. Note: the accumulate has mutable internal state lz->initial and lz->total. With some refactoring we can replace the lz->init p...
og:site_nameGitHub
og:typeobject
hostnamegithub.com
expected-hostnamegithub.com
None837767abbd14b05f219fd812ef2842c659968b63619e1b966dded83972ab5bca
turbo-cache-controlno-preview
diff-viewunified
go-importgithub.com/python/cpython git https://github.com/python/cpython.git
octolytics-dimension-user_id1525981
octolytics-dimension-user_loginpython
octolytics-dimension-repository_id81598961
octolytics-dimension-repository_nwopython/cpython
octolytics-dimension-repository_publictrue
octolytics-dimension-repository_is_forkfalse
octolytics-dimension-repository_network_root_id81598961
octolytics-dimension-repository_network_root_nwopython/cpython
turbo-body-classeslogged-out env-production page-responsive full-width
disable-turbotrue
browser-stats-urlhttps://api.github.com/_private/browser/stats
browser-errors-urlhttps://api.github.com/_private/browser/errors
release36b9c371e4e031091f1b89adf913d9e6993943df
ui-targetfull
theme-color#1e2327
color-schemelight dark

Links:

Skip to contenthttps://github.com/python/cpython/pull/144486/files#start-of-content
https://github.com/
Sign in https://github.com/login?return_to=https%3A%2F%2Fgithub.com%2Fpython%2Fcpython%2Fpull%2F144486%2Ffiles
GitHub CopilotWrite better code with AIhttps://github.com/features/copilot
GitHub Copilot appDirect agents from issue to mergehttps://github.com/features/ai/github-app
MCP RegistryNewIntegrate external toolshttps://github.com/mcp
ActionsAutomate any workflowhttps://github.com/features/actions
CodespacesInstant dev environmentshttps://github.com/features/codespaces
IssuesPlan and track workhttps://github.com/features/issues
Code ReviewManage code changeshttps://github.com/features/code-review
GitHub Advanced SecurityFind and fix vulnerabilitieshttps://github.com/security/advanced-security
Code securitySecure your code as you buildhttps://github.com/security/advanced-security/code-security
Secret protectionStop leaks before they starthttps://github.com/security/advanced-security/secret-protection
Why GitHubhttps://github.com/why-github
Documentationhttps://docs.github.com
Bloghttps://github.blog
Changeloghttps://github.blog/changelog
Marketplacehttps://github.com/marketplace
View all featureshttps://github.com/features
Enterpriseshttps://github.com/enterprise
Small and medium teamshttps://github.com/team
Startupshttps://github.com/enterprise/startups
Nonprofitshttps://github.com/solutions/industry/nonprofits
App Modernizationhttps://github.com/solutions/use-case/app-modernization
DevSecOpshttps://github.com/solutions/use-case/devsecops
DevOpshttps://github.com/solutions/use-case/devops
CI/CDhttps://github.com/solutions/use-case/ci-cd
View all use caseshttps://github.com/solutions/use-case
Healthcarehttps://github.com/solutions/industry/healthcare
Financial serviceshttps://github.com/solutions/industry/financial-services
Manufacturinghttps://github.com/solutions/industry/manufacturing
Governmenthttps://github.com/solutions/industry/government
View all industrieshttps://github.com/solutions/industry
View all solutionshttps://github.com/solutions
AIhttps://github.com/resources/articles?topic=ai
Software Developmenthttps://github.com/resources/articles?topic=software-development
DevOpshttps://github.com/resources/articles?topic=devops
Securityhttps://github.com/resources/articles?topic=security
View all topicshttps://github.com/resources/articles
Customer storieshttps://github.com/customer-stories
Events & webinarshttps://github.com/resources/events
Ebooks & reportshttps://github.com/resources/whitepapers
Business insightshttps://github.com/solutions/executive-insights
GitHub Skillshttps://skills.github.com
Documentationhttps://docs.github.com
Customer supporthttps://support.github.com
Community forumhttps://github.com/orgs/community/discussions
Trust centerhttps://github.com/trust-center
Partnershttps://github.com/partners
View all resourceshttps://github.com/resources
GitHub SponsorsFund open source developershttps://github.com/open-source/sponsors
Security Labhttps://securitylab.github.com
Maintainer Communityhttps://maintainers.github.com
Acceleratorhttps://github.com/open-source/accelerator
GitHub Starshttps://stars.github.com
Archive Programhttps://archiveprogram.github.com
Topicshttps://github.com/topics
Trendinghttps://github.com/trending
Collectionshttps://github.com/collections
Enterprise platformAI-powered developer platformhttps://github.com/enterprise
GitHub Advanced SecurityEnterprise-grade security featureshttps://github.com/security/advanced-security
Copilot for BusinessEnterprise-grade AI featureshttps://github.com/features/copilot/copilot-business
Premium SupportEnterprise-grade 24/7 supporthttps://github.com/enterprise/premium-support
Pricinghttps://github.com/pricing
Search syntax tipshttps://docs.github.com/search-github/github-code-search/understanding-github-code-search-syntax
documentationhttps://docs.github.com/search-github/github-code-search/understanding-github-code-search-syntax
Sign in https://github.com/login?return_to=https%3A%2F%2Fgithub.com%2Fpython%2Fcpython%2Fpull%2F144486%2Ffiles
Sign up https://github.com/signup?ref_cta=Sign+up&ref_loc=header+logged+out&ref_page=%2F%3Cuser-name%3E%2F%3Crepo-name%3E%2Fpull_requests%2Fshow%2Ffiles&source=header-repo&source_repo=python%2Fcpython
Reloadhttps://github.com/python/cpython/pull/144486/files
Reloadhttps://github.com/python/cpython/pull/144486/files
Reloadhttps://github.com/python/cpython/pull/144486/files
Please reload this pagehttps://github.com/python/cpython/pull/144486/files
python https://github.com/python
cpythonhttps://github.com/python/cpython
Please reload this pagehttps://github.com/python/cpython/pull/144486/files
Notifications https://github.com/login?return_to=%2Fpython%2Fcpython
Fork 35k https://github.com/login?return_to=%2Fpython%2Fcpython
Star 73.8k https://github.com/login?return_to=%2Fpython%2Fcpython
Code https://github.com/python/cpython
Issues 5k+ https://github.com/python/cpython/issues
Pull requests 2.3k https://github.com/python/cpython/pulls
Actions https://github.com/python/cpython/actions
Projects https://github.com/python/cpython/projects
Security and quality 0 https://github.com/python/cpython/security
Insights https://github.com/python/cpython/pulse
Code https://github.com/python/cpython
Issues https://github.com/python/cpython/issues
Pull requests https://github.com/python/cpython/pulls
Actions https://github.com/python/cpython/actions
Projects https://github.com/python/cpython/projects
Security and quality https://github.com/python/cpython/security
Insights https://github.com/python/cpython/pulse
Sign up for GitHub https://github.com/signup?return_to=%2Fpython%2Fcpython%2Fissues%2Fnew%2Fchoose
terms of servicehttps://docs.github.com/terms
privacy statementhttps://docs.github.com/privacy
Sign inhttps://github.com/login?return_to=%2Fpython%2Fcpython%2Fissues%2Fnew%2Fchoose
kumaraditya303https://github.com/kumaraditya303
python:mainhttps://github.com/python/cpython/tree/main
eendebakpt:accumulate_ft_v2https://github.com/eendebakpt/cpython/tree/accumulate_ft_v2
Conversation 0 https://github.com/python/cpython/pull/144486
Commits 8 https://github.com/python/cpython/pull/144486/commits
Checks 47 https://github.com/python/cpython/pull/144486/checks
Files changed 3 https://github.com/python/cpython/pull/144486/files
gh-123471: Make concurrent iteration over itertools.accumulate thread-safe https://github.com/python/cpython/pull/144486/files#top
Show all changes 8 commits https://github.com/python/cpython/pull/144486/files
e77b639 Make accumulate thread-safe eendebakpt Feb 3, 2026 https://github.com/python/cpython/pull/144486/commits/e77b639554500903aa9ec6927e3921cddb5d7a47
2621b88 add ft test for accumulate eendebakpt Feb 4, 2026 https://github.com/python/cpython/pull/144486/commits/2621b8847e13e1e2fc428d7b609304053f444a5a
bd4fa04 reduce test duration eendebakpt Feb 4, 2026 https://github.com/python/cpython/pull/144486/commits/bd4fa041e85aa403eb9c2b3f4fec9fc1c3e56860
124450b 📜🤖 Added by blurb_it. blurb-it[bot] Feb 4, 2026 https://github.com/python/cpython/pull/144486/commits/124450b8963d65e36e9257f146240e88914aaa59
2511892 📜🤖 Added by blurb_it. blurb-it[bot] Feb 5, 2026 https://github.com/python/cpython/pull/144486/commits/2511892b4d991ffa40ec7bc08ee32e2e634ff8b8
06fef05 Delete Misc/NEWS.d/next/Library/2026-02-05-20-40-20.gh-issue-123471.U… eendebakpt Feb 5, 2026 https://github.com/python/cpython/pull/144486/commits/06fef05283378d4e39daad877070d19570ebea92
eea0675 Merge branch 'main' into accumulate_ft_v2 eendebakpt Feb 23, 2026 https://github.com/python/cpython/pull/144486/commits/eea0675d6cc85046606fbc03dee65065854b2746
aa9991d Merge branch 'main' into accumulate_ft_v2 kumaraditya303 Mar 16, 2026 https://github.com/python/cpython/pull/144486/commits/aa9991ddc68cfa48213fad883c7b3e1060c9bd27
Clear filters https://github.com/python/cpython/pull/144486/files
Please reload this pagehttps://github.com/python/cpython/pull/144486/files
Please reload this pagehttps://github.com/python/cpython/pull/144486/files
test_itertools.py https://github.com/python/cpython/pull/144486/files#diff-7362be533ffc13087d21c8aad53b5408e236b985fe2ea62a082f5f401883a135
2026-02-04-20-30-59.gh-issue-123471.1dnPvs.rst https://github.com/python/cpython/pull/144486/files#diff-b302872ab1c1f5829f6d827fa5e8ce559caf4e12acb89212aa7cffc47a845b32
itertoolsmodule.c https://github.com/python/cpython/pull/144486/files#diff-dc27cbdf2b9f6e5236cade13cf301d352a7abd2a8b1988f2517d6f5b7a30c201
Lib/test/test_free_threading/test_itertools.pyhttps://github.com/python/cpython/pull/144486/files#diff-7362be533ffc13087d21c8aad53b5408e236b985fe2ea62a082f5f401883a135
View file https://github.com/eendebakpt/cpython/blob/aa9991ddc68cfa48213fad883c7b3e1060c9bd27/Lib/test/test_free_threading/test_itertools.py
Open in desktop https://desktop.github.com
https://github.co/hiddenchars
https://github.com/python/cpython/pull/144486/{{ revealButtonHref }}
https://github.com/python/cpython/pull/144486/files#diff-7362be533ffc13087d21c8aad53b5408e236b985fe2ea62a082f5f401883a135
https://github.com/python/cpython/pull/144486/files#diff-7362be533ffc13087d21c8aad53b5408e236b985fe2ea62a082f5f401883a135
Misc/NEWS.d/next/Library/2026-02-04-20-30-59.gh-issue-123471.1dnPvs.rsthttps://github.com/python/cpython/pull/144486/files#diff-b302872ab1c1f5829f6d827fa5e8ce559caf4e12acb89212aa7cffc47a845b32
View file https://github.com/eendebakpt/cpython/blob/aa9991ddc68cfa48213fad883c7b3e1060c9bd27/Misc/NEWS.d/next/Library/2026-02-04-20-30-59.gh-issue-123471.1dnPvs.rst
Open in desktop https://desktop.github.com
https://github.co/hiddenchars
https://github.com/python/cpython/pull/144486/{{ revealButtonHref }}
https://github.com/python/cpython/blob/main/.github/CODEOWNERS#L522
Modules/itertoolsmodule.chttps://github.com/python/cpython/pull/144486/files#diff-dc27cbdf2b9f6e5236cade13cf301d352a7abd2a8b1988f2517d6f5b7a30c201
View file https://github.com/eendebakpt/cpython/blob/aa9991ddc68cfa48213fad883c7b3e1060c9bd27/Modules/itertoolsmodule.c
Open in desktop https://desktop.github.com
https://github.co/hiddenchars
https://github.com/python/cpython/pull/144486/{{ revealButtonHref }}
https://github.com/python/cpython/pull/144486/files#diff-dc27cbdf2b9f6e5236cade13cf301d352a7abd2a8b1988f2517d6f5b7a30c201
https://github.com/python/cpython/pull/144486/files#diff-dc27cbdf2b9f6e5236cade13cf301d352a7abd2a8b1988f2517d6f5b7a30c201
https://github.com/python/cpython/pull/144486/files#diff-dc27cbdf2b9f6e5236cade13cf301d352a7abd2a8b1988f2517d6f5b7a30c201
https://github.com/python/cpython/pull/144486/files#diff-dc27cbdf2b9f6e5236cade13cf301d352a7abd2a8b1988f2517d6f5b7a30c201
Please reload this pagehttps://github.com/python/cpython/pull/144486/files
https://github.com
Termshttps://docs.github.com/site-policy/github-terms/github-terms-of-service
Privacyhttps://docs.github.com/site-policy/privacy-policies/github-privacy-statement
Securityhttps://github.com/security
Statushttps://www.githubstatus.com/
Communityhttps://github.community/
Docshttps://docs.github.com/
Contacthttps://support.github.com?tags=dotcom-footer

Viewport: width=device-width

URLs of crawlers that visited me.