重叠模型之完成例程

最新推荐文章于 2017-10-16 00:06:19 发布

原创最新推荐文章于 2017-10-16 00:06:19 发布 · 714 阅读

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CC 4.0 BY-SA版权

文章标签：

#thread #io #application #system #function

本文详细解析了WSAWaitForMultipleEvents函数的工作原理及其参数意义，通过代码示例展示了如何利用该函数来处理I/O完成事件，特别强调了fAlertable参数的作用。

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WSAWaitForMultipleEvents Function

Parameters

fAlertable

A value that specifies whether the thread is placed in an alertable wait state so the system can execute I/O completion routines. If TRUE, the thread is placed in an altertable wait state and WSAWaitForMultipleEvents can return when the system executes an I/O completion routine. In this case, WSA_WAIT_IO_COMPLETION is returned and the event that was being waited on is not signaled yet. The application must call the WSAWaitForMultipleEvents function again. If FALSE, the thread is not placed in an altertable wait state and I/O completion routines are not executed.

完成例程的讲解比较少～尤其是调用的函数到底是谁？有没有又开了个线程。

参数说明（上面的说明说的很清楚～）

和
DWORD curThreadId = GetCurrentThreadId();

都可以知道是没有，但是具体是怎样运行的那？

单步一下就知道了，再加个Sleep，更清晰了～

CODE：

while(true)
{
  //step 5:
  DWORD Index = WSAWaitForMultipleEvents(1, EventArray, FALSE, 1000, TRUE);
  //step 6:
  if( Index == WSA_IO_INCOMPLETE || Index == WSA_WAIT_TIMEOUT )
  {
   Sleep(30000);
   DWORD curThreadId = GetCurrentThreadId();
   printf("IO_INCOMPLETE waitEvent Thread Id is %d/n", curThreadId);
   int i = 1;
  }
  else if(Index == WSA_WAIT_IO_COMPLETION)
  {
   DWORD curThreadId = GetCurrentThreadId();
   printf("IO_COMPLETE waitEvent Thread Id is %d/n", curThreadId);
  }
}