原创 ubuntu多线程的实现

#include 
#include 
#include 
#include 			
#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
}