没有匹配的函数调用'pthread

本文介绍了没有匹配的函数调用'pthread_create'的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我使用Xcode和C ++制作一个简单的游戏。 问题是以下代码：

#include< pthread.h> void * draw（void * pt）{ // ... } void * input（void * pt）{ // ... } void Game :: create_threads（void）{ pthread_t draw_t，input_t; pthread_create（& draw_t，NULL，& Game :: draw，NULL）; //错误 pthread_create（& input_t，NULL，& Game :: draw，NULL）; //错误 // ... }

但Xcode给了我错误：没有匹配的函数调用'pthread_create'。我不知道因为我已经包括 pthread.h 。

出了什么问题？ / p>

谢谢！

解决方案

线程回调必须是一个（void *）（*）（void *）类型的函数。

你仍然可以包含这个函数作为类函数，静态的。

例如：

class Game { protected： void draw（void）; static void * game_draw_thread_callback（void *）; }; //并在您的.cpp文件中... void Game :: create_threads（void）{ //将Game实例作为线程回调用户数据 pthread_create（&draw_t，NULL，Game :: game_draw_thread_callback，this）; } static void * Game :: game_draw_thread_callback（void * game_ptr）{ //我是一个C程序员，对不起C的演员。 Game * game =（Game *）game_ptr; //运行实际绘图的方法， //但是现在，你在一个线程！ game-> draw（）; }

I'm using Xcode and C++ to make a simple game. The problem is the following code:

#include <pthread.h> void *draw(void *pt) { // ... } void *input(void *pt) { // .... } void Game::create_threads(void) { pthread_t draw_t, input_t; pthread_create(&draw_t, NULL, &Game::draw, NULL); // Error pthread_create(&input_t, NULL, &Game::draw, NULL); // Error // ... }

But Xcode gives me the error: "No matching function call to 'pthread_create'". I haven't an idea 'cause of I've included pthread.h already.

What's wrong?

Thanks!

解决方案

As Ken states, the function passed as the thread callback must be a (void*)(*)(void*) type function.

You can still include this function as a class function, but it must be declared static. You'll need a different one for each thread type (e.g. draw), potentially.

For example:

class Game { protected: void draw(void); static void* game_draw_thread_callback(void*); }; // and in your .cpp file... void Game::create_threads(void) { // pass the Game instance as the thread callback's user data pthread_create(&draw_t, NULL, Game::game_draw_thread_callback, this); } static void* Game::game_draw_thread_callback(void *game_ptr) { // I'm a C programmer, sorry for the C cast. Game * game = (Game*)game_ptr; // run the method that does the actual drawing, // but now, you're in a thread! game->draw(); }