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
#include
#include
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