多线程之私有数据(YC)

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

pthread_key_t key;

void *thread1(void *arg)
{
    int i=10;
    int tid=pthread_self();
    printf("In thread 1,ID :%u\n",tid);
    printf("Set the private value1\n");
    pthread_setspecific(key,&i);
    sleep(2);  //等待线程2改变数据，看是否有影响
    printf("The value in thread1 is %d\n",(*(int *)pthread_getspecific(key)));
}

void *thread2(void *arg)
{
    int j=20;
    int tid=pthread_self();
    printf("In thread 2,ID :%u\n",tid);
    printf("Set the private value2\n");
    pthread_setspecific(key,&j);
    sleep(1);
    printf("The value in thread2 is %d\n",(*(int *)pthread_getspecific(key)));
}

int main(void)
{
    pthread_t td1,td2;
    pthread_key_create(&key,NULL);
    pthread_create(&td1,NULL,(void *)thread1,NULL);
    pthread_create(&td2,NULL,(void *)thread2,NULL);
    pthread_join(td1,NULL);  //等待子线程结束
    pthread_join(td2,NULL);  //等待子线程结束
    pthread_key_delete(key);
    return 0;
}

运行结果：