🐛 fix free threaded detection in cmake

Author: m-unkel

CMakeLists.txt

@@ -17,6 +17,8 @@ if(DEFINED ENV{TOOLCHAIN})
   message(STATUS "TOOLCHAIN: $ENV{TOOLCHAIN}")
 endif()
 
+list(APPEND c104_PRIVATE_DEFINITIONS VERSION_INFO=\"${C104_VERSION_INFO}\")
+
 # ##############################################################################
 # pybind11 and Python3
 # ##############################################################################
@@ -31,6 +33,20 @@ if(MSVC)
   list(APPEND c104_tests_PRIVATE_LIBRARIES pybind11::windows_extras)
 endif()
 
+# Run Python to check for GIL status
+execute_process(
+  COMMAND
+    ${Python_EXECUTABLE} -c
+    "import sysconfig; print(bool(sysconfig.get_config_var(\"Py_GIL_DISABLED\")) and 1 or 0)"
+  OUTPUT_VARIABLE PYTHON_FREE_THREADED
+  OUTPUT_STRIP_TRAILING_WHITESPACE)
+if(PYTHON_FREE_THREADED)
+  list(APPEND c104_PRIVATE_DEFINITIONS Py_GIL_DISABLED=1)
+  message(STATUS "Python is running without GIL (free threaded)")
+else()
+  message(STATUS "Python is running with GIL (classic)")
+endif()
+
 # ##############################################################################
 # atomic
 # ##############################################################################
@@ -150,7 +166,7 @@ if(c104_PRIVATE_LIBRARIES)
   target_link_libraries(_c104 PRIVATE ${c104_PRIVATE_LIBRARIES})
 endif()
 
-target_compile_definitions(_c104 PRIVATE VERSION_INFO=\"${C104_VERSION_INFO}\")
+target_compile_definitions(_c104 PRIVATE ${c104_PRIVATE_DEFINITIONS})
 
 # ##############################################################################
 # Tests with Catch2

bin/aarch64-build.sh

@@ -12,6 +12,7 @@ rm -rf /opt/c104/dist/*manylinux*.whl ; \
 /opt/python/cp311-cp311/bin/python3 -m pip wheel /opt/c104 ; \
 /opt/python/cp312-cp312/bin/python3 -m pip wheel /opt/c104 ; \
 /opt/python/cp313-cp313/bin/python3 -m pip wheel /opt/c104 ; \
+/opt/python/cp313-cp313t/bin/python3 -m pip wheel /opt/c104 ; \
 auditwheel repair ./c104-*-linux_aarch64.whl ; \
 mv ./wheelhouse/* /opt/c104/dist/
 "

bin/linux-build.sh

@@ -11,6 +11,7 @@ rm -rf /opt/c104/dist/*manylinux*.whl ; \
 /opt/python/cp311-cp311/bin/python3 -m pip wheel /opt/c104 ; \
 /opt/python/cp312-cp312/bin/python3 -m pip wheel /opt/c104 ; \
 /opt/python/cp313-cp313/bin/python3 -m pip wheel /opt/c104 ; \
+/opt/python/cp313-cp313t/bin/python3 -m pip wheel /opt/c104 ; \
 auditwheel repair ./c104-*-linux_x86_64.whl ; \
 mv ./wheelhouse/* /opt/c104/dist/
 "

bin/win-build.bat

@@ -3,6 +3,7 @@
 REM change working directory to repository directory
 cd /D "%~dp0/.."
 
+py -3.13t -m pip wheel . -w dist
 py -3.13 -m pip wheel . -w dist
 py -3.12 -m pip wheel . -w dist
 py -3.11 -m pip wheel . -w dist

c104/__init__.py

@@ -1,7 +1,25 @@
 import sys
+import io
+import logging
 from types import BuiltinFunctionType
 from c104 import _c104
 
+# create logger instance
+logger = logging.getLogger("c104")
+logger.setLevel(logging.INFO)
+ch = logging.StreamHandler()
+formatter = logging.Formatter(
+    fmt="[{asctime}] {levelname:<8} [{name}] {message}",
+    datefmt="%Y-%m-%d %H:%M:%S",
+    style="{"
+)
+ch.setFormatter(formatter)
+logger.addHandler(ch)
+
+# test for unbuffered mode
+if isinstance(sys.stdout.buffer, io.BufferedWriter):
+    logger.info("Python is running in buffered mode, messages will be printed with high delay! Set PYTHONUNBUFFERED=1 environment variable to enable unbuffered mode.")
+
 # Iterate over all attributes in the submodule
 for attr_name, attr_value in vars(_c104).items():
     # Check if the attribute is a class or a function

src/python.cpp

@@ -45,27 +45,11 @@
 #else
 #define VERSION_INFO "embedded"
 #include <pybind11/embed.h>
-#define PY_MODULE(var)                                                         \
-  PYBIND11_EMBEDDED_MODULE(c104, var, py::mod_gil_not_used())
+#define PY_MODULE(var) PYBIND11_EMBEDDED_MODULE(c104, var)
 #endif
 
 using namespace pybind11::literals;
 
-// set UNBUFFERED mode for correct order of stdout flush between python and c++
-struct EnvironmentInitializer {
-  EnvironmentInitializer() {
-#if defined(_WIN32) || defined(_WIN64)
-    _putenv("PYTHONUNBUFFERED=1");
-#else
-    // Use setenv on Linux
-    setenv("PYTHONUNBUFFERED", "1", 1);
-#endif
-  }
-};
-
-// Initialize the environment variable before main() is called
-static EnvironmentInitializer initializer;
-
 // Bind Number with Template
 template <typename T>
 void bind_Number(py::module &m, const std::string &name,