关于mfc下多线程socket出错

问？：
我用CSocket写通信程序，但执行到下面的函数时总出错，是什么原因？

是多线程通信，每个线程创建了一个套接字:CMySocket *m_pClientSocket = New CMySocket;

然后在OnSendSocket函数中调用：m_pClientSocket->Send(str,len);

如果消息很少，或者中间有Sleep，则没有错误，否则必然出现ASSERT(pState->m_hSocketWindow != NULL);的错误。

听说

1 是一个Bug，我用VC 5.0也打了sp5,

2 同一个套接字不能在不同的线程传输，但是我每一个线程创建了一个单独的套接字

3 没有调用AfxSockInit()，但是我在每个线程的初始化中都调用了这个函数。

现在实在没有办法解决，请大家帮忙，感谢！

下面的函数是 .../MFC/SRC/SOCKCORE.CPP 里的函数。

BOOL CSocket::PumpMessages(UINT uStopFlag)

{

// The same socket better not be blocking in more than one place.

ASSERT(m_pbBlocking == NULL);

_AFX_SOCK_THREAD_STATE* pState = _afxSockThreadState;

ASSERT(pState->m_hSocketWindow != NULL); //这句出错这句出错这句出错这句出错

BOOL bBlocking = TRUE;

m_pbBlocking = &bBlocking;

答：(from microsoft)

Most frequently, this problem is due to the sharing of
CSocket objects between multiple threads.

A CSocket object should be
used only in the context of a single thread because the SOCKET handle
encapsulated by a CAsyncSocket object is stored in a per-thread handle map.
(CSocket is derived from CAsyncSocket.) Other information is stored on a
per-thread basis, including a hidden notification window that MFC uses for
socket notifications.

The assertion failure line, which can be found
in Sockcore.cpp in the /Msvc20/Mfc/Src directory, is:

ASSERT(pThreadState->m_hSocketWindow != NULL);

This assertion failure occurs because the CSocket object was either
created or accepted in the context of another thread. The socket notification
window was created in a different thread, and the m_hSocketWindow for the
current thread is NULL, thus the assertion failure.