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。

#more test.c

/*

* =====================================================================================

*       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

参考资料：http://hi.baidu.com/livetodaywell/blog/item/7d1b7811fbf58af6c2ce79e6.html