c - 与 main() 线程同步

Question

main()
{
    i=9000000000;      // to synchronize thread with while loop
    while(i)i--;      //if i don't use these two lines then my program terminates before thread starts.
    udp_socket();
    fun();
}

udp_socket()
{ 
    // open a udp socket then create thread
    pthread_create(tid1,NULL,fun2,(int *)socket_descriptor2);
}

fun()
{
}

fun2(int socket_descriptor2)
{
    while(1)
    {
    }
}

1. 我打开了一个 UDP 套接字，然后创建了一个线程，在线程内部，一个 while 循环不断地在定义的 ip 和端口上接收数据。

2. 当 main 终止时，我的线程停止工作......

3. 我想在 main() 终止时连续执行我的线程，或者我的 main() 也在不终止的情况下连续执行。

我该如何实现？

Answer 1

i want to execute my thread continuously even when the main() terminates

通过调用 pthread_exit() 退出 int main():

int main(void)
{
  ...

  pthread_exit(NULL); /* This call exits main() and leaves all other thread running. */

  return 0; /* Is never reached, it's just there to silence the compiler. */
}