錯誤與通過使用線程

Question

更新代碼的指針：11年3月7日：下午9時29分

using namespace std; 

void * matrixACreate(void * param); 
void *status; 

struct a 
{ 
    int Arow; // Matrix A  
    int Acol; // WxX 
    int low; // Range low 
    int high; 
}; 

int main(int argc, char * argv[]) 
{  
    struct a matrix_mult_info; 

    matrix_mult_info.Arow = atoi(argv[1]); // Matrix A 
    matrix_mult_info.Acol = atoi(argv[2]); // WxX 

    matrix_mult_info.low = atoi(argv[5]); // Range low 
    matrix_mult_info.high = atoi(argv[6]); 

    pthread_t matrixAthread; 

    pthread_t runner; 
    int error, retValue; 

    struct a * a = (struct a *) malloc(sizeof(struct a)); 
    error = pthread_create(&matrixAthread, NULL, matrixACreate, a); 
    //error = pthread_create(&matrixAthread, NULL, matrixBCreate, sendB); 
    retValue = pthread_join(matrixAthread, &status); 
    //retValue = pthread_join(matrixBthread, &status); 

    return 0; 
} 

void * matrixACreate(void * param) {  
    struct a * matrix = (struct a *) param;  
    int range = ((matrix->high - matrix->low) + 1);  
    cout << matrix->Arow << endl;  
    return 0; 
}  

Answer 1

struct a * a = (struct a *) malloc(sizeof(struct a)); 
// init a's members 
error = pthread_create(&matrixAthread, NULL, matrixACreate, a); 

編輯：在回答更新問題：

void * matrixACreate(void * param) { 
    struct a * matrix = (struct a *) param; 
    int range = ((matrix->high - matrix->low) + 1); 
    cout << matrix->Arow << endl; 
    return NULL; 
}