Igor:
Heya. Last thing, am curious if you've seen this one
before. Not sure if it's relevant to VC++ SP4 or not...
-Scott
-------------------------------
Details of the Bug -
1) Call Stack Status on Unhandled exception
CMapPtrToPtr::GetValueAt(void * 0x00000108) line 179 + 3 bytes
CAsyncSocket::LookupHandle(unsigned int 264, int 0) line 385 + 15 bytes
CAsyncSocket::AttachHandle(unsigned int 264, CAsyncSocket * 0x00b82cd0 {CVPNSocket},
int 0) line 407 + 13 bytes
CAsyncSocket::Socket(int 1, long 63, int 0, int 2) line 557
CAsyncSocket::Create(unsigned int 4182, int 1, long 63, const char * 0x00000000) line
105 + 20 bytes
CVPNSocket::CreateListener() line 218 + 24 bytes
CVPNManager::StartConnection(CGUID & {...}) line 287
CVPNManager::OnStartConnection(_EFMSG * 0x00b82e30) line 733 + 12 bytes
CVPNManager::ProcessVPNMessages(_EFMSG * 0x00b82e30) line 149
CVPNManager::PreTranslateMessage(tagMSG * 0x00b82f74 {msg=0x000008b4 wp=0x00b82e30
lp=0x00000000}) line 116 + 15 bytes
CWinThread::PumpMessage() line 841 + 30 bytes
CWinThread::Run() line 480 + 11 bytes
2) Microsoft has confirmed this to be a bug in the Microsoft products, kindly refer to
the fix given below
FIX: Unhandled Exception Using MFC Sockets in Visual C++ 6.0
Q193101
--------------------------------------------------------------------------------
The information in this article applies to:
The Microsoft Foundation Classes (MFC), used with:
Microsoft Visual C++, 32-bit Editions, version 6.0
--------------------------------------------------------------------------------
SYMPTOMS
When using MFC sockets in secondary threads in a statically linked MFC Visual C++ 6.0
application, an unhandled exception occurs.
CAUSE
The reason for the unhandled exception is that an object of type CMapPtrToPtr pointer,
pointed to by m_pmapSocketHandle, is never created.
RESOLUTION
The handle maps used by the sockets need to be created for each thread. The following
code shows a function to do this:
void SocketThreadInit()
{
#ifndef _AFXDLL
#define _AFX_SOCK_THREAD_STATE AFX_MODULE_THREAD_STATE
#define _afxSockThreadState AfxGetModuleThreadState()
_AFX_SOCK_THREAD_STATE* pState = _afxSockThreadState;
if (pState->m_pmapSocketHandle == NULL)
pState->m_pmapSocketHandle = new CMapPtrToPtr;
if (pState->m_pmapDeadSockets == NULL)
pState->m_pmapDeadSockets = new CMapPtrToPtr;
if (pState->m_plistSocketNotifications == NULL)
pState->m_plistSocketNotifications = new CPtrList;
#endif
}
This function should be called once in each secondary thread before the first socket
is created in the new thread.
STATUS
Microsoft has confirmed this to be a bug in the Microsoft products listed at the
beginning of this article.
This bug was corrected in Visual Studio 6.0 Service Pack 3. You will need to call
AfxSocketInit() in each thread that uses sockets.
For more information about Visual Studio service packs, please see the following
articles in the Microsoft Knowledge Base:
Q194022 INFO: Visual Studio 6.0 Service Packs, What, Where, Why
Q194295 HOWTO: Tell That Visual Studio 6.0 Service Packs Are Installed
MORE INFORMATION
In MFC socket applications, AfxSocketInit is called once, by default, in the primary
thread. This function creates the handle maps for the primary thread when statically
linked to MFC. However, when a secondary thread is created, these per-thread handle
maps are not created. AfxSocketInit must be called in each thread to initialize the
socket libraries.
Steps to Reproduce Behavior
Create an application that creates a socket in a secondary thread and uses MFC in a
static link library. You can use the MultiSoc sample described in the following
Knowledge Base article by changing the project settings to use MFC in a static library:
Q175668 FILE: MultiSoc: Illustrates Using Sockets in Multiple Threads
Run the application and create a socket in a secondary thread.
REFERENCES
For additional information, please see the following article in the Microsoft
Knowledge Base:
Q175668 FILE: MultiSoc: Illustrates Using Sockets in Multiple Threads
© Microsoft Corporation 1998, All Rights Reserved.
Contributions by Isaac L. Varon, Microsoft Corporation
Additional query words: LookupHandle CAsyncSocket AttachHandle GetValueAt assert
wincore.cpp 980 Application Error 0xc0000005 m_pHashTable CSocket access violation
debug assertion failed
Keywords : kbMFC kbVC600bug kbWinsock kbVS600sp3fix kbGrpMFCATL kbNoUpdate
Issue type : kbbug
Technology : kbvc
Last Reviewed: March 8, 2000
© 2001 Microsoft Corporation. All rights reserved. Terms of Use.
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