线程属性:pthread_attr_t

一.函数：

1.线程属性的初始化与销毁：
#include <pthread.h>
int pthread_attr_init(pthread_attr_t *attr);
int pthread_attr_destroy(pthread_attr_t   *attr);
Both return: 0 if OK, error number on failure
2.设置线程属性--detackstate(分离状态):
#include <pthread.h>
int pthread_attr_getdetachstate(const pthread_attr_t *restrict attr, int *detachstate);
int pthread_attr_setdetachstate(pthread_attr_t *attr,  int detachstate);
Both return: 0 if OK, error number on failure
detachstate有两个选项：PTHREAD_CREATE_DETACHED 分离状态启动线程
                       PTHREAD_CREATE_JOINABLE 正常状态启动线程
3.设置线程属性--stackaddr(线程栈的最低地址),stacksize(线程栈的大小)：
#include <pthread.h>
int pthread_attr_getstack(const pthread_attr_t *restrict attr,
                                                  void **restrict stackaddr,
                                                  size_t *restrict stacksize);
int pthread_attr_setstack(const pthread_attr_t *attr,
                                                  void *stackaddr,  
                                                  size_t *stacksize);
Both return: 0 if OK, error number on failure
4.设置线程属性--stacksize(线程栈的大小)：
#include <pthread.h>
int pthread_attr_getstacksize(const pthread_attr_t *restrict attr,
                                                          size_t *restrict stacksize);
int pthread_attr_setstacksize(pthread_attr_t *attr,
                                                          size_t stacksize);
Both return: 0 if OK, error number on failure
5.设置线程属性--guardsize(线程栈末尾的警戒缓冲区大小)
#include <pthread.h>
int pthread_attr_getguardsize(const pthread_attr_t *restrict attr,
                                                          size_t *restrict guardsize);
int pthread_attr_setguardsize(pthread_attr_t *attr, 
                                                          size_t guardsize); 
Both return: 0 if OK, error number on failure
二.重点：

三.例子：

以分离状态创建线程

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

void * thr_fn()
{
    printf("thread run\n");
    pthread_exit((void *)0);
}

int main()
{
    pthread_t tid;
    pthread_attr_t attr;
    int ret;

    ret = pthread_attr_init(&attr);
    if(ret!=0)
        printf("init attr error:%s\n",strerror(ret));
    ret = pthread_attr_setdetachstate(&attr,PTHREAD_CREATE_DETACHED);
    if(ret==0)
    {
        ret = pthread_create(&tid,&attr,thr_fn,NULL);
        if(ret!=0)
            printf("create thread error:%s\n",strerror(ret));
    }
    pthread_attr_destroy(&attr);
    sleep(1);
    return 0;
}

#include <stdio.h> #include <pthread.h> #include <string.h> void * thr_fn() { printf("thread run\n"); pthread_exit((void *)0); } int main() { pthread_t tid; pthread_attr_t attr; int ret; ret = pthread_attr_init(&attr); if(ret!=0) printf("init attr error:%s\n",strerror(ret)); ret = pthread_attr_setdetachstate(&attr,PTHREAD_CREATE_DETACHED); if(ret==0) { ret = pthread_create(&tid,&attr,thr_fn,NULL); if(ret!=0) printf("create thread error:%s\n",strerror(ret)); } pthread_attr_destroy(&attr); sleep(1); return 0; }运行：
root@ubuntu1:~/12# ./a.out
thread run

转自http://blog.csdn.net/wyjlovec/article/details/7347128