从“void*(*)(int*)”到“void*(*)(void*)”的无效转换

我正在尝试计算多线程 C++ 程序来计算前 N 个整数的立方和。

每个线程应该计算一个部分和以在它们之间平均分配工作。与 pthread_create 参数苦苦挣扎，它给出了错误。

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

#define n 6
#define p 4

using namespace std; 

int part = 0; 
int arr[] = { 1,2,3,4,5,6 };
int sum[p]={0};
void* cube_array(int arr[]) 
{ 

    int thread_part = part++; 

    for (int i = thread_part * (n/ p); i < (thread_part + 1) * (n/ p); i++) {
        sum[thread_part] += arr[i]*arr[i]*arr[i]; 
        }

        return NULL;
} 

// Driver Code 
int main() 
{ 

    pthread_t threads[p]; 


    for (int i = 0; i < p; i++) 
        pthread_create(&threads[i], NULL, cube_array, (void*)NULL); 

    for (int i = 0; i < p; i++) 
        pthread_join(threads[i], NULL); 

    int total_sum = 0; 
    for (int i = 0; i < p; i++) 
        total_sum += sum[i]; 

    cout << "sum is " << total_sum << endl; 

    return 0; 
} 

回答

int pthread_create(pthread_t *thread, const pthread_attr_t *attr,
                          void *(*start_routine) (void *), void *arg);

void* cube_array(void* temp_arr) 
{ 
    int* arr = (int*)temp_arr;
    
    int thread_part = part++;