如何通过vector< int>在C ++中正确pthread_create? [英] How pass vector<int> to pthread_create correctly in C++?

问题描述

我想创建一个将向量作为参数传递的线程. 但是我遇到了以下错误:

I would like to create a thread passing a vector as parameter. but i got the following errors:

error: invalid conversion from ‘int’ to ‘void* (*)(void*)’ [-fpermissive]

error: initializing argument 3 of ‘int pthread_create(pthread_t*, const pthread_attr_t*, void* (*)(void*), void*)’ [-fpermissive]

我有以下代码:

#include <iostream>
#include <vector>
#include <pthread.h>

using namespace std;

void* func(void* args)
{
    vector<int>* v = static_cast<vector<int>*>(args);
    cout << "Vector size: " << v->size();
}

int main ( int argc, char* argv[] )
{

  vector<int> integers;
  pthread_t thread;


      for ( int i = 0; i < 10; i++)
        integers.push_back(i+1);

       // overheat call
       //pthread_create( &thread, NULL, func, static_cast<void*>(&integers));

       pthread_create( &thread, NULL,func,&integers);

       cout << "Main thread finalized" << endl;

 return 0;
}

我该怎么做呢? 谢谢

仅在此处忘记了包含的帖子；已修改.

forgot the includes posting here only; Revised.

我遇到了新的错误:

error: stray ‘\305’ in program
error: stray ‘\231’ in program

我想知道这件事.

谢谢.

FINAL EDIT : Thanks to all. Sorry, I had another int var called func in other location.
Thanks for your help.

推荐答案

您已经忘记包含<vector>；这会使编译器感到困惑，因为它首先无法生成func，然后在调用pthread_create时无法将其标识为函数.

You have forgotten to include <vector>; this confuses the compiler as it first fails to generate func, and then fails to identify it as a function in the call to pthread_create.

添加了该代码后，您的代码应进行编译(并且您可以根据需要删除static_cast<void*>)；但是要正常工作，您还需要在向量超出范围之前调用pthread_join，并从func返回值.

Once you include that, your code should compile (and you can remove the static_cast<void*> if you like); but to work correctly you also need to call pthread_join before the vector goes out of scope, and return a value from func.

更新:您的最新编辑已破坏了代码:您应该不将func强制转换为void*，但应将其保留为函数指针.这应该起作用:

UPDATE: your latest edit has broken the code: you should not cast func to void*, but leave it as a function pointer. This should work:

pthread_create(&thread, NULL, func, &integers);

类似stray ‘\305’ in program的错误意味着您的代码中包含一些奇怪的字符，尽管它们不在您发布的代码中.看一下错误消息所指的行.

Errors like stray ‘\305’ in program imply that you have some strange characters in your code, although they're not in the code you've posted. Have a look at the lines that the error messages refer to.

这篇关于如何通过vector< int>在C ++中正确pthread_create?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！