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GeezerVison is showing github.com — [3.14] gh-151218: Replace sys.flags in PyConfig_Set() (#151402) by vstinner · Pull Request #151553 · python/cpython

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@vstinner

@vstinner vstinner commented Jun 16, 2026 •
edited by bedevere-app Bot
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PyConfig_Set() and sys.set_int_max_str_digits() now replace sys.flags (create a new object), instead of modifying sys.flags in-place.

Modifying sys.flags in-place can lead to data races when multiple threads are reading or writing sys.flags in parallel.

Use _Py_atomic functions to get and set max_str_digits members.

(cherry picked from commit b16d23f)

  • Issue: Data race in sys_set_flag when sys.set_int_max_str_digits() is called concurrently with free-threaded build #151218

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@vstinner @picnixz
pythongh-151218: Replace sys.flags in PyConfig_Set() (python#151402)
dbde367 
PyConfig_Set() and sys.set_int_max_str_digits() now replace
sys.flags (create a new object), instead of modifying sys.flags in-place.

Modifying sys.flags in-place can lead to data races when multiple
threads are reading or writing sys.flags in parallel.

Use _Py_atomic functions to get and set max_str_digits members.

Co-authored-by: Bénédikt Tran <[email protected]>
(cherry picked from commit b16d23f)
@vstinner
vstinner requested review from FFY00 and ericsnowcurrently as code owners June 16, 2026 16:24
@read-the-docs-community

read-the-docs-community Bot commented Jun 16, 2026

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Documentation build overview

📚 cpython-previews | 🛠️ Build #33167748 | 📁 Comparing dbde367 against main (b16d23f)

  🔍 Preview build  

406 files changed · ± 388 modified · - 18 deleted

± Modified

  • about.html
  • bugs.html
  • glossary.html
  • index.html
  • license.html
  • py-modindex.html
  • c-api/allocation.html
  • c-api/apiabiversion.html
  • c-api/arg.html
  • c-api/buffer.html
  • and 378 more...

- Deleted

  • _static/tachyon-example-flamegraph.html
  • _static/tachyon-example-heatmap.html
  • c-api/sentinel.html
  • c-api/slots.html
  • deprecations/c-api-pending-removal-in-3.19.html
  • deprecations/c-api-pending-removal-in-3.20.html
  • deprecations/pending-removal-in-3.20.html
  • deprecations/pending-removal-in-3.21.html
  • deprecations/soft-deprecations.html
  • extending/first-extension-module.html
  • and 8 more...
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@bedevere-app bedevere-app Bot added the awaiting core review label Jun 16, 2026
This was referenced Jun 16, 2026
Data race in sys_set_flag when sys.set_int_max_str_digits() is called concurrently with free-threaded build #151218
Closed
gh-151218: Replace sys.flags in PyConfig_Set() #151402
Merged
@vstinner
vstinner merged commit 60132db into python:3.14 Jun 16, 2026
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@vstinner
vstinner deleted the replace_sys_flags14 branch June 16, 2026 16:55
@bedevere-app bedevere-app Bot removed the awaiting core review label Jun 16, 2026
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@FFY00 FFY00 Awaiting requested review from FFY00 FFY00 is a code owner
@ericsnowcurrently ericsnowcurrently Awaiting requested review from ericsnowcurrently ericsnowcurrently is a code owner

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@vstinner
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