initialize_finalize_loop experiment

pybind11/initialize_finalize_loop/build.sh

@@ -0,0 +1,6 @@
+#! /usr/bin/bash
+set -e
+set -x
+MAIN=initialize_finalize_loop
+clang++ -o $MAIN.o -c -std=c++17 -O0 -g -Wall -Wextra -Wconversion -Wcast-qual -Wdeprecated -Wnon-virtual-dtor -Wunused-result -Werror -DPYBIND11_STRICT_ASSERTS_CLASS_HOLDER_VS_TYPE_CASTER_MIX -DPYBIND11_ENABLE_TYPE_CASTER_ODR_GUARD_IF_AVAILABLE -I$HOME/forked/pybind11/include -I/usr/include/python3.10 $MAIN.cpp
+clang++ -o $MAIN -rdynamic -O0 -g $MAIN.o -lpython3.10 -lpthread -ldl -lutil

pybind11/initialize_finalize_loop/initialize_finalize_loop.cpp

@@ -0,0 +1,34 @@
+/* ./build.sh
+
+   ./initialize_finalize_loop
+   top -p `pgrep initialize_fina` -b      # NO leaking with Python 3.10.7
+   # Output in top_no_wrap_class.txt
+
+   ./initialize_finalize_loop wrap_class
+   top -p `pgrep initialize_fina` -b      # Leaking even with Pytyhon 3.10.7
+   # Output in top_wrap_class.txt
+ */
+
+#include <pybind11/embed.h>
+#include <pybind11/pybind11.h>
+
+namespace py = pybind11;
+
+int main(int argc, char *[]) {
+    bool wrap_class = (argc > 1);
+    while (true) {
+        py::initialize_interpreter();
+        {
+            auto imom = py::reinterpret_steal<py::object>(PyModule_New("in_memory_only_module"));
+            if (!imom) {
+                throw py::error_already_set();
+            }
+            if (wrap_class) {
+                struct empty {};
+                py::class_<empty>(imom, "empty");
+            }
+        }
+        py::finalize_interpreter();
+    }
+    return 0;
+}