pybind11 方法如何最终调用共享库中的函数？

Question

I can make as much out as its build system generates a shared object, and also a Python module as a proxy to that shared object. But how does the Python runtime end up doing a dlopen of the generated shared object and bind Python method calls on to corresponding functions in the shared library?

I also found a reference in Python's import system about shared libraries, but nothing beyond that. Does CPython treat .so files in the module path as Python modules?

Answer 1

When doing import module Python will look for files with various extensions that could be python modules. That can be module.py , but also module.so (on Linux) or module.pyd (on Windows).

When loading a shared object, Python will load it like any dynamic library and then it will call the module's init method: It must be named PyInit_{module_name_here} and exported in the shared library.

You can read more about it here .