GH-118943: Fix a race condition when generating jit_stencils.h#118957
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brandtbucher added type-bug 
savannahostrowski left a comment
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Overall, this LGTM. Just one comment.
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hroncok left a comment
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The change makes perfect sense and should fix the problem. Hard to test due to the nature of the issue, hence untested.
One question though (and one optional suggestion).
| file.write(digest) | ||
| ifcomment: | ||
| file.write(f"// {comment}\n\n") | ||
| file.write("") |
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Not entirely sure what was the purpose of this line, but it is no longer there. I guess it did nothing, correct?
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Nice catch. Yeah, I think this was originally intended to write a newline, but it was really doing nothing. But I think we do want to add a newline whether or not there's a comment, so I'll move one of them from the comment line to here.
Tools/jit/_targets.py Outdated
| file.write(f"{line}\n") | ||
| jit_stencils_new.replace(jit_stencils) | ||
| finally: | ||
| jit_stencils_new.unlink(True) |
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I had to guess (and look up) what the boolean stands for. Would you mind using a keyword argument instead?
| jit_stencils_new.unlink(True) | |
| jit_stencils_new.unlink(missing_ok=True) |
Thanks @brandtbucher for the PR 🌮🎉.. I'm working now to backport this PR to: 3.13. |
…ythonGH-118957) (cherry picked from commit 4702b7b) Co-authored-by: Brandt Bucher <brandtbucher@microsoft.com>
GH-119101 is a backport of this pull request to the 3.13 branch. |
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Write to a temporary file first, then rename it to the intended
jit_stencils.hfile. This keeps other build steps from assuming that the file has been successfully generated when it's still in the process of being written.CC: @savannahostrowski
jit.cmay be built with an incompletejit_stencils.h#118943