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GH-118943: Fix a race condition when generating jit_stencils.h (GH-118957)

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Brandt Bucher 2024-05-16 12:11:42 -04:00 • committed by GitHub
parent ab73bcdf73
commit 4702b7b5bd
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2 changed files with 15 additions and 7 deletions
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3
Misc/NEWS.d/next/Build/2024-05-11-15-11-30.gh-issue-118943.VI_MnY.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 compilation errors could be caused
by an incompletely-generated header file.

19
Tools/jit/_targets.py
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@ -212,13 +212,18 @@ def build(
):
return
stencil_groups = asyncio.run(self._build_stencils())
with jit_stencils.open("w") as file:
file.write(digest)
if comment:
file.write(f"// {comment}\n\n")
file.write("")
for line in _writer.dump(stencil_groups):
file.write(f"{line}\n")
jit_stencils_new = out / "jit_stencils.h.new"
try:
with jit_stencils_new.open("w") as file:
file.write(digest)
if comment:
file.write(f"// {comment}\n")
file.write("\n")
for line in _writer.dump(stencil_groups):
file.write(f"{line}\n")
jit_stencils_new.replace(jit_stencils)
finally:
jit_stencils_new.unlink(missing_ok=True)
class _COFF(