linux多线程

#include <stdio.h>#include <stdlib.h>#include <pthread.h>#define THREAD_NUM 3#define REPEAT_TIMES 5#define DELAY 4void *thrd_func(void *arg);int main(){    pthread_t thread[THREAD_NUM];    int no;    void *tret;        srand((int)time(0)); // 初始化随机函数发生器     for(no=0;no<THREAD_NUM;no++){        if (pthread_create(&thread[no],NULL,thrd_func,(void*)no)!=0) { // 创建THREAD_NUM个线程，传入(void*)no作为thrd_func的参数            printf("Create thread %d error!\n",no);            exit(1);        } else            printf("Create thread %d success!\n",no);    }    for(no=0;no<THREAD_NUM;no++){        if (pthread_join(thread[no],&tret)!=0){ // 等待thread[no]线程结束，线程函数返回值放在tret中            printf("Join thread %d error!\n",no);            exit(1);        }else            printf("Join thread %d success!\n",no);    }            return 0;}void *thrd_func(void *arg){    int thrd_num=(void*)arg;    int delay_time=0;    int count=0;    printf("Thread %d is starting.\n",thrd_num);    for(count=0;count<REPEAT_TIMES;count++) {        delay_time=(int)(DELAY*(rand()/(double)RAND_MAX))+1;        sleep(delay_time);        printf("\tThread %d:job %d delay =%d.\n",thrd_num,count,delay_time);    }    printf("Thread %d is exiting.\n",thrd_num);    pthread_exit(NULL);}

运行结果：

Create thread 0 success!
Create thread 1 success!
Create thread 2 success!
Thread 2 is starting.
Thread 1 is starting.
Thread 0 is starting.
 Thread 0:job 0 delay =1.
 Thread 0:job 1 delay =1.
 Thread 2:job 0 delay =3.
 Thread 1:job 0 delay =3.
 Thread 2:job 1 delay =2.
 Thread 2:job 2 delay =1.
 Thread 0:job 2 delay =4.
 Thread 1:job 1 delay =4.
 Thread 2:job 3 delay =1.
 Thread 1:job 2 delay =2.
 Thread 2:job 4 delay =2.
Thread 2 is exiting.
 Thread 0:job 3 delay =3.
 Thread 1:job 3 delay =2.
 Thread 0:job 4 delay =2.
Thread 0 is exiting.
Join thread 0 success!
 Thread 1:job 4 delay =1.
Thread 1 is exiting.
Join thread 1 success!
Join thread 2 success!