pthread_getspecific和pthread_setspecific使用

pthread_getpecific和pthread_setspecific实现同一个线程中不同函数间共享数据的一种很好的方式。

/*
* =====================================================================================
*       Filename:  thead.c
*    Description:  getspecific
*        Created:  05/10/2011 12:09:43 AM
* =====================================================================================
*/
#include<stdio.h>
#include<pthread.h>
#include<string.h>
pthread_key_t p_key;

void func1()
{
int *tmp = (int*)pthread_getspecific(p_key);//同一线程内的各个函数间共享数据。
printf("%d is runing in %s\n",*tmp,__func__);

}
void *thread_func(void *args)
{

pthread_setspecific(p_key,args);

int *tmp = (int*)pthread_getspecific(p_key);//获得线程的私有空间
printf("%d is runing in %s\n",*tmp,__func__);

*tmp = (*tmp)*100;//修改私有变量的值

func1();

return (void*)0;
}
int main()
{
pthread_t pa, pb;
int a=1;
int b=2;
pthread_key_create(&p_key,NULL);
pthread_create(&pa, NULL,thread_func,&a);
pthread_create(&pb, NULL,thread_func,&b);
pthread_join(pa, NULL);
pthread_join(pb, NULL);
return 0;
}

#gcc -lpthread test.c -o test

# ./test

2 is runing in thread_func

1 is runing in thread_func

100 is runing in func1

200 is runing in func1