【C】——如何用線程進行參數的傳遞

　　直接上代碼：

#include<pthread.h>
#include<stdio.h>

struct val{
    int num1;
    int num2;
};

//send a int to arg
void *text(void *arg)
{
    int *p = (int *)arg;
    printf("arg is %d\n",*p);
    pthread_exit(NULL);
}

//send char to arg
void *text2(void *arg)
{
    char *d = (char *)arg;
    printf("arg is %s\n",arg);
    pthread_exit(NULL);
}

//send a struct to arg
void *text3(void *arg)
{
    struct val *v = (struct val *)arg;
    printf("arg is v.num1:%d,v.num2:%d\n",v->num1,v->num2);
    pthread_exit(NULL);
}

int main()
{
    pthread_t pth;
    char val[10] = "i am arg.";
    int arry = 10;
    pthread_create(&pth, NULL, text,(void *)&arry);
    pthread_join(pth, NULL);
    
    pthread_create(&pth, NULL, text2, (void *)val);
    pthread_join(pth, NULL);    

    struct val v;
    v.num1 = 0;
    v.num2 = 1;
    pthread_create(&pth, NULL, text3, (void *)&v); //一定要用&v因為結構體是值類型；
    pthread_join(pth, NULL);

    return 0;
}

結果如下：

　　每次傳遞的時候，都需要轉化成void，接收之后，再由void轉換成自己需要的類型！