线程实例 传值与传址

 

传值:

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

void thread(int i)
{
    int k;
    for (k=0;k<10;k++) {
        printf("this is %d pthread.\n",i);
    }
}

int main(){
    pthread_t pthread_id;
    int i,ret;
    int m=2;

    ret=pthread_create(&pthread_id,NULL,(void *)thread,(void *)m);
    if (ret!=0) {
        printf("create pthread error!\n");
        exit(0);
    }
    for (i=0;i<10;i++) {
        printf("this is 1 pthread.\n");
    }
    pthread_join(pthread_id,NULL);
    return 0;
}

 

编译的时候需要加上-lpthread开关：

gcc  -o  thread_1 thread_1.c -lpthread

 

 

传址

 

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

void thread(int *i)
{
    int k;
    int sum=0;
    for (k=1;k<101;k++) {
        sum=sum+k;
    }
    *i=sum;
}

int main(){
    pthread_t pthread_id;
    int i,ret;
    int *m;
    int sum=0;
    m=(int *)malloc(sizeof(int));

    ret=pthread_create(&pthread_id,NULL,(void *)thread,(void *)&m);
    if (ret!=0) {
        printf("create pthread error!\n");
        exit(0);
    }
   
    for (i=0;i<1000000;i++) {
        sum=sum+1;
    }
    printf("main sum =%d\n",sum);
    printf("pthread sum =%d\n",m);

    //free((void *)m);

    return 0;
}