gh-108724: Fix _PySemaphore_Wait call during thread deletion #116483
Merged
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
In general, when `_PyThreadState_GET()` is non-NULL then the current thread is "attached", but there is a small window during `PyThreadState_DeleteCurrent()` where that's not true: tstate_delete_common is called when the thread is detached, but before current_fast_clear(). This updates _PySemaphore_Wait() to handle that case.
colesbury
force-pushed
the
gh-108724-sema-wait
branch
from
e4aa866
to
6a6ca9e
Compare
colesbury
changed the title
ericsnowcurrently
approved these changes
Mar 8, 2024
There was a problem hiding this comment.
LGTM
I have one very minor comment about the applicability of the PyEval_ReleaseThread() call. Feel free to address it (or not) how you think makes sense.
As to the motivation for this PR, should we aim for eliminating the small window you described in PR description? It vaguely feels like something is our of whack with that.
Co-authored-by: Eric Snow <ericsnowcurrently@gmail.com>
Yeah, I'll put up another PR that does that as well. |
adorilson
pushed a commit
to adorilson/cpython
that referenced
this pull request
Mar 25, 2024
…ython#116483) In general, when `_PyThreadState_GET()` is non-NULL then the current thread is "attached", but there is a small window during `PyThreadState_DeleteCurrent()` where that's not true: tstate_delete_common() is called when the thread is detached, but before current_fast_clear(). Co-authored-by: Eric Snow <ericsnowcurrently@gmail.com>
diegorusso
pushed a commit
to diegorusso/cpython
that referenced
this pull request
Apr 17, 2024
…ython#116483) In general, when `_PyThreadState_GET()` is non-NULL then the current thread is "attached", but there is a small window during `PyThreadState_DeleteCurrent()` where that's not true: tstate_delete_common() is called when the thread is detached, but before current_fast_clear(). Co-authored-by: Eric Snow <ericsnowcurrently@gmail.com>
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
In general, when
_PyThreadState_GET()is non-NULL then the current thread is "attached", but there is a small window duringPyThreadState_DeleteCurrent()where that's not true:tstate_delete_common()is called when the thread is detached, but before current_fast_clear().This updates
_PySemaphore_Wait()to handle that case.