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docs: extend PYBIND11_MODULE documentation, mention mod_gil_not_used (#5250)

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This follows up on PR 5148, which introduced support for free-threaded CPython.
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Ralf Gommers 2024-07-18 08:26:45 +02:00 committed by Henry Schreiner
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include/pybind11/detail/common.h
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@ -462,6 +462,22 @@ PYBIND11_WARNING_POP
return "Hello, World!";
});
}
The third macro argument is optional (available since 2.13.0), and can be used to
mark the extension module as safe to run without the GIL under a free-threaded CPython
interpreter. Passing this argument has no effect on other interpreters.
.. code-block:: cpp
PYBIND11_MODULE(example, m, py::mod_gil_not_used()) {
m.doc() = "pybind11 example module safe to run without the GIL";
// Add bindings here
m.def("foo", []() {
return "Hello, Free-threaded World!";
});
}
\endrst */
#define PYBIND11_MODULE(name, variable, ...) \
static ::pybind11::module_::module_def PYBIND11_CONCAT(pybind11_module_def_, name) \