第四期 pthread_cancel()

/* Name thread_create.c
 * Author dyli
 * date 20110615
 * Description 处理getpid()、pthread_self()、pthread_create()函数，
 *                并进行讨论主子线程的问题
 * */


/***pthread_cancel()函数************************************************
*    函数功能：    可以（在其它线程中）结束一个线程
*    函数原型：
*    返回值 ：    返回值为0时，创建成功！！
*
*    所需库 ：
* 备注 ：
****************************************************************/

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

int i=0;

void *thread_func(void *argc)
{
    int *val=argc;
    printf("Hi,man! I'm a son Thread\n\n");
    if(argc!=NULL)
    {
        //for(int i=0;i<1000;i++)
        //c99不允许在for循环里初始化，会弹出在 C99 模式之外使用‘for’循环初始化声明错误

        for(;i<50;i++)
        {
            ++i; //这两个不经意的＋＋，产生了50内顺序显示奇数的效果
            printf("Now Show you the message:%d\n",*val);
            printf("Thread run %d times",i);
        }
    }
}

int main()
{
    pthread_t tid;
    int t_arg =10;
    int err;
    err=pthread_create(&tid,NULL,thread_func,&t_arg); //--->带参数的pthread_create()函数
    if(err)//返回值为0时，创建成功！！
    {
        printf("create thread error!!\n");
    }

    sleep(1);
    printf("run in main Thread\n");
    if(pthread_cancel(tid))//---------------------------->func1结束线程
    {
        printf("向id为tid的线程发送了取消执行，但并不表示该线程会停止执行\n");
    }
    return 0;
}

[root@localhost thread_cancel]# ./thread_cancel Hi,man! I'm a son Thread
Now Show you the message:10Thread run 1 timesNow Show you the message:10Thread run 3 timesNow Show you the message:10Thread run 5 timesNow Show you the message:10Thread run 7 timesNow Show you the message:10Thread run 9 timesNow Show you the message:10Thread run 11 timesNow Show you the message:10Thread run 13 timesNow Show you the message:10Thread run 15 timesNow Show you the message:10Thread run 17 timesNow Show you the message:10Thread run 19 timesNow Show you the message:10Thread run 21 timesNow Show you the message:10Thread run 23 timesNow Show you the message:10Thread run 25 timesNow Show you the message:10Thread run 27 timesNow Show you the message:10Thread run 29 timesNow Show you the message:10Thread run 31 timesNow Show you the message:10Thread run 33 timesNow Show you the message:10Thread run 35 timesNow Show you the message:10Thread run 37 timesNow Show you the message:10Thread run 39 timesNow Show you the message:10Thread run 41 timesNow Show you the message:10Thread run 43 timesNow Show you the message:10Thread run 45 timesNow Show you the message:10Thread run 47 timesNow Show you the message:10Thread run 49 timesrun in main Thread向id为tid的线程发送了取消执行，但并不表示该线程会停止执行[root@localhost thread_cancel]#

 

 

if(argc!=NULL)
    {
         for(int i=0;i<1000;i++)
        //c99不允许在for循环里初始化，会弹出在 C99 模式之外使用‘for’循环初始化声明错误
        //for(;i<50;i++)
        {
            ++i; //这两个不经意的＋＋，产生了50内顺序显示奇数的效果
            printf("Now Show you the message:%d\n",*val);
            printf("Thread run %d times",i);
        }
    }

 

 

[root@localhost thread_cancel]# make
cc -c -o thread_cancel.o thread_cancel.c
thread_cancel.c: 在函数‘thread_func’中:
thread_cancel.c:30: 错误：在 C99 模式之外使用‘for’循环初始化声明
make: *** [thread_cancel.o] 错误 1