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Enable Free-threaded Python (PEP 703) support for Python 3.13t+ #26786

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Merged
tianleiwu merged 7 commits into from
Dec 17, 2025
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Merged

Enable Free-threaded Python (PEP 703) support for Python 3.13t+ #26786

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3d6d70c
Py_GIL_DISABLED
tianleiwu Dec 13, 2025
ea8a28e
refine
tianleiwu Dec 15, 2025
4a5a0a7
refine
tianleiwu Dec 15, 2025
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clean up
tianleiwu Dec 15, 2025
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clean
tianleiwu Dec 16, 2025
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tianleiwu Dec 16, 2025
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format
tianleiwu Dec 16, 2025
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14 changes: 14 additions & 0 deletions cmake/onnxruntime_python.cmake
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Original file line number Diff line number Diff line change
Expand Up @@ -69,6 +69,20 @@ endif()

onnxruntime_add_shared_library_module(onnxruntime_pybind11_state ${onnxruntime_pybind_srcs})

message(STATUS "Python_EXECUTABLE: ${Python_EXECUTABLE}")

# Query Py_GIL_DISABLED (PEP 703)
execute_process(
COMMAND "${Python_EXECUTABLE}" -c
"import sysconfig; print(sysconfig.get_config_var('Py_GIL_DISABLED') or '0')"
RESULT_VARIABLE _py_result
OUTPUT_VARIABLE _py_gil_disabled
OUTPUT_STRIP_TRAILING_WHITESPACE
)
if (_py_result EQUAL 0 AND _py_gil_disabled STREQUAL "1")
message(STATUS "Py_GIL_DISABLED=1 detected: Enabling free-threaded support for onnxruntime_pybind11_state")
endif()

if(MSVC)
# The following source file is only needed for the EPs that use delayloading. Namely, DML and WebGPU.
target_sources(onnxruntime_pybind11_state PRIVATE "${ONNXRUNTIME_ROOT}/core/dll/delay_load_hook.cc")
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5 changes: 5 additions & 0 deletions onnxruntime/python/onnxruntime_pybind_module.cc
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Expand Up @@ -102,7 +102,12 @@ static constexpr bool HAS_COLLECTIVE_OPS = false;

void CreateQuantPybindModule(py::module& m);

// Check if we are building with GIL disabled (Free-threaded)
#ifdef Py_GIL_DISABLED
PYBIND11_MODULE(onnxruntime_pybind11_state, m, py::mod_gil_not_used()) {
#else
PYBIND11_MODULE(onnxruntime_pybind11_state, m) {
#endif
auto st = CreateInferencePybindStateModule(m);
if (!st.IsOK())
throw pybind11::import_error(st.ErrorMessage());
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