Fix a race condition in TexManager.make_dvi. #30426
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tacaswell
reviewed
Aug 14, 2025
tacaswell
approved these changes
Aug 14, 2025
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It's still used by the TemporaryDirectory call. |
timhoffm
reviewed
Aug 14, 2025
Previously, a race condition could occur if, while a process had called make_tex (generating the tex file in the global cache) and was going to call the latex subprocess (to generate the dvi file), another process also called make_tex for the same tex string and started rewriting the tex source. In that case, the latex subprocess could see a partially written (invalid) tex source. Fix that by generating the tex source in a process-private temporary directory, where the latex process is already going to run anyways. (This is cheap compared to the latex subprocess invocation.) Apply a similar strategy for make_png as well.
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I chose to also fix make_png here as well. |
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Previously, a race condition could occur if, while a process had called make_tex (generating the tex file in the global cache) and was going to call the latex subprocess (to generate the dvi file), another process also called make_tex for the same tex string and started rewriting the tex source. In that case, the latex subprocess could see a partially written (invalid) tex source.
Fix that by generating the tex source in a process-private temporary directory, where the latex process is already going to run anyways. (This is cheap compared to the latex subprocess invocation.)
See #30420 (comment) (point (2)).
Edit: did the same to make_png.
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