pthread_attr_t 线程属性(二)

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

[cpp] view plaincopy

#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