在C ++代码中发布Python GIL [英] Releasing Python GIL while in C++ code

问题描述

我有一个用C ++编写的库，我使用SWIG包装并在python中使用。通常有一个类有很少的方法。问题是调用这些方法可能很耗时 - 它们可能挂起我的应用程序（调用这些方法时GIL不会释放）。所以我的问题是：

为这些方法调用释放GIL的最简单的方法是什么？

（我明白，如果我使用C库，我可以用一些额外的C代码包装，但这里我使用C ++和类）

$ b $真正的问题是SWIG没有记录良好（我看到使用changelog进行搜索的提示）;）

好的，我发现我可以在SWIG中使用内联函数，并使用宏释放/获取GIL，它看起来像这样：

 ％inline％{
 void wrappedFunction（OriginalObject * o，< parameters>）{
 Py_BEGIN_ALLOW_THREADS 
 o-> originalFunction（< parameters>）; 
 Py_END_ALLOW_THREADS 
} 
％} 
  

此功能不存在在原来的C ++，但可用在python模块。这是（几乎）正是我想要的。 （我想要的是像python装饰器包装原始方法）

I've got a library written in C++ which I wrap using SWIG and use in python. Generally there is one class with few methods. The problem is that calling these methods may be time consuming - they may hang my application (GIL is not released when calling these methods). So my question is:

What is the simplest way to release GIL for these method calls?

(I understand that if I used a C library I could wrap this with some additional C code, but here I use C++ and classes)

解决方案

The real problem is that SWIG is not documented well (I saw hints to use changelog for searching ;) ).

Ok, I found out that I can do inline functions in SWIG and use macros to release/acquire GIL, it looks like this:

%inline %{
    void wrappedFunction(OriginalObject *o, <parameters>) {
    Py_BEGIN_ALLOW_THREADS
    o->originalFunction(<parameters>);
    Py_END_ALLOW_THREADS
}
%}

This function is not present in original C++, but available in python module. This is (almost) exactly what I wanted. (what I would like is to wrap original method like python decorator does)

这篇关于在C ++代码中发布Python GIL的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！