多线程编程实验

/*thread.c*/#include <stdio.h>#include <stdlib.h>#include <pthread.h>#define THREAD_NUMBER   3 /*线程数*/#define REPEAY_NUMBER   5 /*每个线程中的小任务*/#define DELAY_TIME_LEVELS 10.0 /*小任务之间的最大时间间隔*/void *thrd_func(void *arg){/*线程函数例程*/    int thrd_num = (int)arg;    int delay_time = 0;    int count = 0;    printf("Thread %d is starting \n",thrd_num);    for(count = 0;count< REPEAY_NUMBER;count++)    {        delay_time = (int) (rand() * DELAY_TIME_LEVELS/(RAND_MAX))+1;        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(void){    pthread_t thread[THREAD_NUMBER];    int no = 0,res;    void * thrd_ret;    srand(time(NULL));    for(no =0;no < THREAD_NUMBER; no ++)    {        /*创建多线程*/        res = pthread_create(&thread[no],NULL,thrd_func,(void*)no);        if(res != 0)        {            printf("Create thread %d failed \n",no);        }    }    printf("Create tread success\n Waiting for threads to finish...\n");    for(no = 0;no <THREAD_NUMBER;no++)    {        /*等待线程结束*/        res = pthread_join(thread[no],&thrd_ret);        if(!res)        {            printf("Thread %d jioned \n",no);        }        else        {            printf("Thread %d jion failed \n",no);        }    }     return 0;}