lysnikolaou commented on code in PR #43606:
URL: https://github.com/apache/arrow/pull/43606#discussion_r1707332850
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python/CMakeLists.txt:
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@@ -855,6 +856,10 @@ set(CYTHON_FLAGS "${CYTHON_FLAGS}" "--warning-errors")
# undocumented Cython feature.
set(CYTHON_FLAGS "${CYTHON_FLAGS}" "--no-c-in-traceback")
+if(CYTHON_VERSION VERSION_GREATER_EQUAL "3.1.0a0")
+ set(CYTHON_FLAGS "${CYTHON_FLAGS}" "-Xfreethreading_compatible=True")
Review Comment:
Whether PyArrow releases the GIL or not does not come into play here.
Declaring the `freethreading_compatible` directive prevents the GIL from
being re-enbaled by the runtime. If it were to not be added, then any
downstream code doing `import pyarrow` would re-enable the GIL, because PyArrow
has not declared that it supports free-threading.
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