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[3.13] GH-118943: Handle races when moving jit_stencils.h (GH-122709)

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(cherry picked from commit 44659d3927)

Co-authored-by: Miro Hrončok <miro@hroncok.cz>
Co-authored-by: Kirill Podoprigora <kirill.bast9@mail.ru>
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Miss Islington (bot) 2024-08-08 22:37:49 +02:00 • committed by GitHub
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3
Misc/NEWS.d/next/Build/2024-06-18-15-28-25.gh-issue-118943.aie7nn.rst Normal file
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@ -0,0 +1,3 @@
Fix a possible race condition affecting parallel builds configured with
``--enable-experimental-jit``, in which :exc:`FileNotFoundError` could be caused by
another process already moving ``jit_stencils.h.new`` to ``jit_stencils.h``.

7
Tools/jit/_targets.py
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@ -221,7 +221,12 @@ class _Target(typing.Generic[_S, _R]):
file.write("\n") file.write("\n")
for line in _writer.dump(stencil_groups): for line in _writer.dump(stencil_groups):
file.write(f"{line}\n") file.write(f"{line}\n")
jit_stencils_new.replace(jit_stencils) try:
jit_stencils_new.replace(jit_stencils)
except FileNotFoundError:
# another process probably already moved the file
if not jit_stencils.is_file():
raise
finally: finally:
jit_stencils_new.unlink(missing_ok=True) jit_stencils_new.unlink(missing_ok=True)