c++多线程和python多线程相互调用（c++线程一直给python推数据）

先看c++代码，很多代码不懂，能百度到的

#define EXPORT __declspec(dllexport)

#include <iostream>
#include <pthread.h>
#include<Python.h>
#include <windows.h>

using namespace std;

pthread_t tids[1];

PyObject* pModule = NULL;//声明变量

void* say_hello(void* args)
{
    
    PyObject* pFunc = NULL;// 声明变量

    pFunc = PyObject_GetAttrString(pModule, "add");

            
    while (true) {

        int a = rand() % 100;

        PyGILState_STATE state = PyGILState_Ensure();

        PyObject* args = Py_BuildValue("(i)", a);//给python函数参数赋值

            PyObject* pRet = PyObject_CallObject(pFunc, args);
        PyGILState_Release(state);

        Sleep(500);
    }     
        
    Py_Finalize();
    
}


class TestLib
{
public:
    void display();
    void init_();
};

void TestLib::display() {
    pthread_create(&tids[0], NULL, say_hello, NULL);
}


void TestLib::init_() {
    Py_SetPythonHome(L"C:/Users/ccy/Anaconda3");
    Py_Initialize();
    PyEval_InitThreads();

    PyGILState_STATE state = PyGILState_Ensure();
    PyRun_SimpleString("import sys");

    PyRun_SimpleString("sys.path.append('./')");

    pModule = PyImport_ImportModule("cpy");
    PyGILState_Release(state);
    
}



extern "C" {
    TestLib obj;
    EXPORT void display() {
        obj.display();
    }
    EXPORT void init_() {
        obj.init_();
    }
 

}

首先 pthread.h的安装可以参考这个网址

https://blog.csdn.net/ZPeng_CSDN/article/details/114108421

TestLib::init_() 里面的内容不能放在线程里面去 init，否则程序运行不起来，要先init，再运行线程

线程里面运行的python代码，必须用

PyGILState_STATE state = PyGILState_Ensure();

这些，否则python的机制不允许，会自动停下来
至于

python的代码：

import ctypes
import time
from threading import Thread
 
lib=ctypes.CDLL(r"./cpyth1.dll")
 
lib.init_()
 
lib.display()
 
class baseEntity():
    a=0
    def __init__(self) -> None:
        pass
 
    def set_a(self,a):
        self.a=a
 
    def get_a(self):
        return self.a
 
bentity=baseEntity()
 
def add(a):
    bentity.set_a(int(a))
 
while 1:
    print(bentity.get_a())
    time.sleep(1)