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python - Threading a c++ program in python

问题描述

I have a Python application written in Kivy that uses a C++ program for a high speed calculation, then it returns a value and my Python application uses that.

The C++ program is wrapped in PyBind11 and imported into the application and then called from Python.

My issue is when the C++ program is executed, my application stops for a short while and I'd still like things to be going on in the background.

I naively thought this could be solved by threading the C++ call, but on second thoughts I think the issue lies in the GIL. Must I unlock the GIL and how could I achieve this?

标签： pythonc++multithreadinggil

解决方案

在没有看到任何代码的情况下，我只能推断您的 Python 代码正在等待 C++ 代码完成，然后再执行任何其他操作。这可能意味着以下两者之一或两者：

  • 您没有在 C++ 代码中解锁 GIL

    • 根据Global Interpreter Lock (GIL) — Miscellaneous — pybind11 2.2.3 文档，使用pybind，这应该是这样完成的：

      py::gil_scoped_release release;
long_running_method();
py::gil_scoped_acquire acquire;

      请注意，您需要 GIL 才能访问任何 Python 机器（包括返回结果）。因此，在发布之前，请确保将所需的所有数据从 Python 类型转换为 C++ 类型。

  • 您没有任何其他活动的Python线程，因此在 C++ 调用正在进行时，没有其他 Python 活动被编程来做任何事情

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