多线程的实现

来源：互联网发布：外文数据库检索编辑：程序博客网时间：2024/06/04 01:06
include <stdio.h>#include <unistd.h>#include <stdlib.h>#include <pthread.h>#define NUM_THREADS 6                                                   // 定义线程总素void *thread_function(void *arg);int main(){   int res;   pthread_t a_thread[NUM_THREADS];                                     // 定义线程数组   void *thread_result;   int lots_of_threads;   for (lots_of_threads = 0; lots_of_threads < NUM_THREADS; lots_of_threads++) {      res = pthread_create(&(a_thread[lots_of_threads]), NULL,            thread_function, (void *) &lots_of_threads);                // 创建一个线程      if (res != 0) {         perror("线程创建失败");         exit(EXIT_FAILURE);      }      sleep(1);                                                                         // 主线程睡眠1秒   }   printf("等待线程结束...\n");   for (lots_of_threads = NUM_THREADS - 1; lots_of_threads >= 0; lots_of_threads--) {      res = pthread_join(a_thread[lots_of_threads], &thread_result);    // 等待线程结束      if (res == 0) {         printf("结束一个线程\n");      } else {         perror("线程结束失败");      }   }   printf("线程全部结束\n");   exit(EXIT_SUCCESS);}void *thread_function(void *arg)                                                // 定义线程函数{   int my_number = *(int *) arg;                                                // 接收主线程传递的参数，该参数可以是任意类型   int rand_num;   printf("线程函数已运行，参数为：%d\n", my_number);   rand_num = 1 + (int) (9.0 * rand() / (RAND_MAX + 1.0));      // 获得一个随机数   sleep(rand_num);                                                             // 线程以随机数定义的时间睡眠   printf("第%d个线程结束\n", my_number);   pthread_exit(NULL);                                                          // 结束线程}
0 0