How can I create another array with using threads by pybind11?

[shinkinf]

HI,
I want to create another array in C++ by using threads from python11.
Even though import object containing the array has been deleted, it remains.
However imported object was deleted, keep array in C++(following codes).
How can I create another array with using threads?

[Cpp Codes (main.cpp)]
#include <pybind11/pybind11.h>
#include <pybind11/stl.h>
#include <pybind11/numpy.h>

std::vector CreateArray(int a);
std::vector _array(0);

std::vector CreateArray(int a)
{
_array.push_back(a);
return _array;
}

PYBIND11_MODULE(arrayproc, m) {
m.doc() = "pybind11 example";
m.def("CreateArray", &CreateArray, "");
}

[Python Codes (main.py)]
import threading

if name == 'main':
import arrayproc as test1
list1 = test1.CreateArray(1)
del(test1)
import arrayproc as test2
list2 = test2.CreateArray(1)

print('length1', len(list1))
print('length2', len(list2))

[Compile Texts]
gcc -O3 -Wall -shared -std=c++11 -fPIC python3 -m pybind11 --includes main.cpp -o arrayprocpython3-config --extension-suffix

best regards,