Linux编程之线程基本编程

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

#define THREAD_NUMBER 3/*线程数*/ 
#define REPEAT_NUMBER 5 /*每个线程中的小任务数*/
#define DELAY_TIME_LEVELS 10.0 /*小任务之间的最大时间间隔*/


void *thrd_func(void *arg)
{
    /*线程函数历程*/
    printf("in thrd_func function\n");

    int thrd_num=(int)arg;
    int delay_time=;
    int count=;

    printf("thread %d is starting\n",thrd_num);

    for(count=;count<REPEAT_NUMBER;count++)
    {
        delay_time=(int)(rand() * DELAY_TIME_LEVELS / (RAND_MAX))+;
        sleep(delay_time);
        printf("\t thread %d :job %d delay=%d\n",thrd_num,count,delay_time);
    }

    printf("thread %d finished\n",thrd_num);

    pthread_exit(NULL); 


}



int main()
{
    int no=,res;
    void *thrd_ret;
    pthread_t thread[THREAD_NUMBER];  /*线程表示符*/

    srand(time(NULL));

    for(no=;no<THREAD_NUMBER;no++)
    {
        /*创建多线程*/
        res=pthread_create(&thread[no],NULL,thrd_func,(void *)no);
        if(res != );
        {
          //  printf("file\n");
            printf("creat thread %d failed\n",no);
            printf("filure ID is %d\n",res);
            exit(res);  
        } 
    }  //end for

    printf("creat treads success\n Waitting for thread to finish...\n");

    for(no=;no<THREAD_NUMBER;no++)
    {
        /*等待线程的结束*/
        res=pthread_join(thread[no],&thrd_ret);

        if(!res)
        {
            printf("Thread %d jioned\n",no);

        }
        else
        {
            printf("Thread %d jioned filed\n"); 

        }


    }


    return ;   
}
           

参考图书《从实践中学嵌入式Linux应用编程程序开发》

华清远见嵌入式学院 冯利美 编著

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