René's URL Explorer Experiment


Title: gh-123471: Make concurrent iteration over itertools.islice thread-safe by eendebakpt · Pull Request #144528 · python/cpython · GitHub

Open Graph Title: gh-123471: Make concurrent iteration over itertools.islice thread-safe by eendebakpt · Pull Request #144528 · python/cpython

X Title: gh-123471: Make concurrent iteration over itertools.islice thread-safe by eendebakpt · Pull Request #144528 · python/cpython

Description: We make itertools.islice safe under free-threading (e.g. guard against crashes) by: Atomically getting and setting the mutable fields cnt and next Using the step field as a sentinel for iterator exhaustion Not clearing the underlying iterator upon exhaustion Note: several other iterators in the itertools module have been made safe using a critical section (e.g. #144402). That approach works here as well and would make the approach a bit more uniform and more readable. Downside of a critical section it that is scales less well. Issue: gh-123471

Open Graph Description: We make itertools.islice safe under free-threading (e.g. guard against crashes) by: Atomically getting and setting the mutable fields cnt and next Using the step field as a sentinel for iterator e...

X Description: We make itertools.islice safe under free-threading (e.g. guard against crashes) by: Atomically getting and setting the mutable fields cnt and next Using the step field as a sentinel for iterator e...

Opengraph URL: https://github.com/python/cpython/pull/144528

X: @github

direct link

Domain: github.com

route-pattern/:user_id/:repository/pull/:id/files(.:format)
route-controllerpull_requests
route-actionfiles
fetch-noncev2:0b4ae901-6007-464c-6cf0-6a6e00a7a896
current-catalog-service-hashae870bc5e265a340912cde392f23dad3671a0a881730ffdadd82f2f57d81641b
request-idCA30:3C777:28FAE18:3A9F14D:6A58F982
html-safe-nonce0cd6e875d760dad2de977a5d67bcc34079c55aceb7d4635bff490beaf250c8c9
visitor-payloadeyJyZWZlcnJlciI6IiIsInJlcXVlc3RfaWQiOiJDQTMwOjNDNzc3OjI4RkFFMTg6M0E5RjE0RDo2QTU4Rjk4MiIsInZpc2l0b3JfaWQiOiIyMzI2MzQzODMwNDk5NTU1NzE0IiwicmVnaW9uX2VkZ2UiOiJpYWQiLCJyZWdpb25fcmVuZGVyIjoiaWFkIn0=
visitor-hmac1e767946188a32561212e3aeb840a5f807fe3465249fe9ec76fda490bc3e9257
hovercard-subject-tagpull_request:3251884382
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/144528/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 make itertools.islice safe under free-threading (e.g. guard against crashes) by: Atomically getting and setting the mutable fields cnt and next Using the step field as a sentinel for iterator e...
og:site_nameGitHub
og:typeobject
hostnamegithub.com
expected-hostnamegithub.com
None5f2a0c7865178af3d91dd9f13b0cdfc3c73a2529c873d2780bb4c01271a57ec6
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
release8aae7b8d6caacacf5c66eaeb2702d8dc88d85b4a
ui-targetfull
theme-color#1e2327
color-schemelight dark

Links:

Skip to contenthttps://github.com/python/cpython/pull/144528/files#start-of-content
https://github.com/
Sign in https://github.com/login?return_to=https%3A%2F%2Fgithub.com%2Fpython%2Fcpython%2Fpull%2F144528%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%2F144528%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/144528/files
Reloadhttps://github.com/python/cpython/pull/144528/files
Reloadhttps://github.com/python/cpython/pull/144528/files
Please reload this pagehttps://github.com/python/cpython/pull/144528/files
python https://github.com/python
cpythonhttps://github.com/python/cpython
Please reload this pagehttps://github.com/python/cpython/pull/144528/files
Notifications https://github.com/login?return_to=%2Fpython%2Fcpython
Fork 35k https://github.com/login?return_to=%2Fpython%2Fcpython
Star 73.9k 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
eendebakpthttps://github.com/eendebakpt
python:mainhttps://github.com/python/cpython/tree/main
eendebakpt:islice_fthttps://github.com/eendebakpt/cpython/tree/islice_ft
Conversation 4 https://github.com/python/cpython/pull/144528
Commits 8 https://github.com/python/cpython/pull/144528/commits
Checks 46 https://github.com/python/cpython/pull/144528/checks
Files changed 3 https://github.com/python/cpython/pull/144528/files
gh-123471: Make concurrent iteration over itertools.islice thread-safe https://github.com/python/cpython/pull/144528/files#top
Show all changes 8 commits https://github.com/python/cpython/pull/144528/files
e5fb151 Make itertools.islice safe in the FT build eendebakpt Feb 5, 2026 https://github.com/python/cpython/pull/144528/commits/e5fb1519fc4414f748823006c37e7882a814fdca
6492f2f add test eendebakpt Feb 5, 2026 https://github.com/python/cpython/pull/144528/commits/6492f2feed947fe51937421f0cfdfff9f9aed677
443404e atomic store of lz->next eendebakpt Feb 5, 2026 https://github.com/python/cpython/pull/144528/commits/443404e052f60afca6c244fb0d9f03eb227a0804
e1e61df use step as sentinel eendebakpt Feb 5, 2026 https://github.com/python/cpython/pull/144528/commits/e1e61dff6b1ce2406e8e5b16eba9ad48d2dec18a
c2cbffb 📜🤖 Added by blurb_it. blurb-it[bot] Feb 5, 2026 https://github.com/python/cpython/pull/144528/commits/c2cbffb6e28f80f021b0c0b915af0f136766fe3a
572c071 Merge branch 'main' into islice_ft eendebakpt Feb 5, 2026 https://github.com/python/cpython/pull/144528/commits/572c0711ed9ec6ab07f6d879987209f0a92acc5a
b406b7f Merge branch 'main' into islice_ft eendebakpt Feb 23, 2026 https://github.com/python/cpython/pull/144528/commits/b406b7f6bd0cc085e9c4fb8df675d1c668d65c1f
e71b7b8 Merge branch 'main' into islice_ft eendebakpt Mar 19, 2026 https://github.com/python/cpython/pull/144528/commits/e71b7b81a4fc9cfd70879a9997a0bae3336af024
Clear filters https://github.com/python/cpython/pull/144528/files
Please reload this pagehttps://github.com/python/cpython/pull/144528/files
Please reload this pagehttps://github.com/python/cpython/pull/144528/files
test_itertools.py https://github.com/python/cpython/pull/144528/files#diff-7362be533ffc13087d21c8aad53b5408e236b985fe2ea62a082f5f401883a135
2026-02-05-20-42-00.gh-issue-123471.Uj-Eyr.rst https://github.com/python/cpython/pull/144528/files#diff-b48fd76e057b0698f89993a7c914ccfd96d67d0a37935431aa30a016cbe4d7a8
itertoolsmodule.c https://github.com/python/cpython/pull/144528/files#diff-dc27cbdf2b9f6e5236cade13cf301d352a7abd2a8b1988f2517d6f5b7a30c201
Lib/test/test_free_threading/test_itertools.pyhttps://github.com/python/cpython/pull/144528/files#diff-7362be533ffc13087d21c8aad53b5408e236b985fe2ea62a082f5f401883a135
View file https://github.com/eendebakpt/cpython/blob/e71b7b81a4fc9cfd70879a9997a0bae3336af024/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/144528/{{ revealButtonHref }}
https://github.com/python/cpython/pull/144528/files#diff-7362be533ffc13087d21c8aad53b5408e236b985fe2ea62a082f5f401883a135
https://github.com/python/cpython/pull/144528/files#diff-7362be533ffc13087d21c8aad53b5408e236b985fe2ea62a082f5f401883a135
https://github.com/python/cpython/pull/144528/files#diff-7362be533ffc13087d21c8aad53b5408e236b985fe2ea62a082f5f401883a135
Misc/NEWS.d/next/Library/2026-02-05-20-42-00.gh-issue-123471.Uj-Eyr.rsthttps://github.com/python/cpython/pull/144528/files#diff-b48fd76e057b0698f89993a7c914ccfd96d67d0a37935431aa30a016cbe4d7a8
View file https://github.com/eendebakpt/cpython/blob/e71b7b81a4fc9cfd70879a9997a0bae3336af024/Misc/NEWS.d/next/Library/2026-02-05-20-42-00.gh-issue-123471.Uj-Eyr.rst
Open in desktop https://desktop.github.com
https://github.co/hiddenchars
https://github.com/python/cpython/pull/144528/{{ revealButtonHref }}
https://github.com/python/cpython/blob/main/.github/CODEOWNERS#L522
Modules/itertoolsmodule.chttps://github.com/python/cpython/pull/144528/files#diff-dc27cbdf2b9f6e5236cade13cf301d352a7abd2a8b1988f2517d6f5b7a30c201
View file https://github.com/eendebakpt/cpython/blob/e71b7b81a4fc9cfd70879a9997a0bae3336af024/Modules/itertoolsmodule.c
Open in desktop https://desktop.github.com
https://github.co/hiddenchars
https://github.com/python/cpython/pull/144528/{{ revealButtonHref }}
https://github.com/python/cpython/pull/144528/files#diff-dc27cbdf2b9f6e5236cade13cf301d352a7abd2a8b1988f2517d6f5b7a30c201
https://github.com/python/cpython/pull/144528/files#diff-dc27cbdf2b9f6e5236cade13cf301d352a7abd2a8b1988f2517d6f5b7a30c201
https://github.com/python/cpython/pull/144528/files#diff-dc27cbdf2b9f6e5236cade13cf301d352a7abd2a8b1988f2517d6f5b7a30c201
kumaraditya303https://github.com/kumaraditya303
Apr 6, 2026https://github.com/python/cpython/pull/144528/files#r3039352087
Learn morehttps://docs.github.com/articles/managing-disruptive-comments/#hiding-a-comment
Please reload this pagehttps://github.com/python/cpython/pull/144528/files
eendebakpthttps://github.com/eendebakpt
Apr 10, 2026https://github.com/python/cpython/pull/144528/files#r3065657067
Learn morehttps://docs.github.com/articles/managing-disruptive-comments/#hiding-a-comment
@rhettingerhttps://github.com/rhettinger
#148348https://github.com/python/cpython/pull/148348
Please reload this pagehttps://github.com/python/cpython/pull/144528/files
https://github.com/python/cpython/pull/144528/files#diff-dc27cbdf2b9f6e5236cade13cf301d352a7abd2a8b1988f2517d6f5b7a30c201
https://github.com/python/cpython/pull/144528/files#diff-dc27cbdf2b9f6e5236cade13cf301d352a7abd2a8b1988f2517d6f5b7a30c201
https://github.com/python/cpython/pull/144528/files#diff-dc27cbdf2b9f6e5236cade13cf301d352a7abd2a8b1988f2517d6f5b7a30c201
Please reload this pagehttps://github.com/python/cpython/pull/144528/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.