[置顶] 等待线程退出pthread_join

源程序：

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

void *thread(void *str)
{
  int i;
 for(i=0;i<3;i++)
  {
     sleep(2);
     printf("This in the thread:%d \n",i);
  }
  return NULL;
}

  int main()
{
  pthread_t pth;
  int i;
 /*创建线程并执行线程执行程序*/
  int ret=pthread_create(&pth,NULL,thread,NULL);//第二个参数，属性通常为NULL
  printf("the main process will be to run,but will be blocked soon \n");
  /*阻塞，等待线程退出*/
  pthread_join(pth,NULL);
  printf("thread was exit \n");
  for(i=0;i<3;i++)
   {
      sleep(1);
      printf("thie in the main process: %d \n",i);
   }
 return 0;
}