[3.14] gh-139103: fix free-threading dataclass.__init__ perf issue (gh-141596)
#141750
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…issue (pythongh-141596) The dataclasses `__init__` function is generated dynamically by a call to `exec()` and so doesn't have deferred reference counting enabled. Enable deferred reference counting on functions when assigned as an attribute to type objects to avoid reference count contention when creating dataclass instances. (cherry picked from commit ce79154) Co-authored-by: Edward Xu <[email protected]>
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The dataclasses
__init__function is generated dynamically by a call toexec()and so doesn't have deferred reference counting enabled. Enable deferred reference counting on functions when assigned as an attribute to type objects to avoid reference count contention when creating dataclass instances.(cherry picked from commit ce79154)
Co-authored-by: Edward Xu [email protected]