C++通过Swig垮线程回调Python函数

概述C++ 定义 Callback 类. PyThreadStateLock 保证垮线程调用成功：     #include <Python/Python.h>class Callback{public: Callback(){} virtual ~Callback(){} virtual void call(ObjWithPyCallback&

C++ 定义 Callback 类. PyThreadStateLock 保证垮线程调用成功：

 

 

#include <Python/Python.h>class Callback{public:    Callback(){}        virtual ~Callback(){}    virtual voID call(ObjWithPyCallback& object){}};class ObjWithPyCallback{public:        ObjWithPyCallback();    ~ObjWithPyCallback();    voID setCallback(Callback &callback);    voID call();     private:    voID NotifyThread();    Callback* callback_;};
class PyThreadStateLock{public:    PyThreadStateLock(voID)    {        state = PyGILState_Ensure( );    }        ~PyThreadStateLock(voID)    {        PyGILState_Release( state );    }private:    PyGILState_STATE state;};

 

Callback.cpp

 

ObjWithPyCallback::ObjWithPyCallback() : callback_(NulL){    Py_Initialize();    PyEval_InitThreads();    PyEval_ReleaseLock();}ObjWithPyCallback::~ObjWithPyCallback(){    }voID ObjWithPyCallback::setCallback(Callback &callback){    callback_ = &callback;}voID ObjWithPyCallback::call(){    if ( ! callback_ )    {        std::cerr << "No callback is set.\n";    }    else    {        thread(&ObjWithPyCallback::NotifyThread,this).detach();//call in another thread        //callback_->call(*this);//call directly            }}voID ObjWithPyCallback::NotifyThread(){    class PyThreadStateLock PyThreadLock;//fix segmentation fault     callback_->call(*this);}

 

.i 文件中

%module(directors="1") cb%{   #include "Callback.h"%}%feature("director") Callback;%include "Callback.h"

 

在 python 中调用：

 

import cbclass CB(cb.Callback):    def __init__(self):        super(CB,self).__init__()    def call(self,x):        print("Hello from CB!")        print(x)o = cb.ObjWithPyCallback()mycb=CB()o.setCallback(mycb)o.call()

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