IIS Crashes when a thread is spawn when the life of the th..

Hi All,
We have a Web application built with ASP Code. The ASP Code in turn calls
VC++ dll through a COM Object. The Com Object spawns a worker thread
(thread-A). Then the worker thread spawns another thread (thread-B). The
code in thread-B contains an infinite looping, so that the life of Thread-B
lasts till IIS is Reset. In other words Thread-B runs as long as IIS runs.
But, after running like 5 or 10 minutes IIS crashes.

IIS crashes because of the infinite loop which is purposely put in to retain
the life of the thread till IIS is reset.
If I dont have the infinite loop, it does not crash...
Would appreciate any help on why IIS is crashing. I have included the IIS
message from Eevet Viewer and the code

Thank you for your time,
- John
==========================================================================
IIS Crash message from the Event Viewer (System) is as follows:
==========================================================================
A process serving application pool 'DefaultAppPool' suffered a fatal
communication error with the World Wide Web Publishing Service. The process
id was '3196'. The data field contains the error number.

==========================================================================
The code in the function which is passed to AfxBeginThread, is as follows.
==========================================================================
UINT WorkerThreadCheckWebReportFile(LPVOID pParam)
{

UINT retval = 0;
CWorkerThreadInfo *pActivityThreadinfo;
pActivityThreadinfo = (CWorkerThreadInfo *)pParam;

if (!pActivityThreadinfo)
return retval;

//Set the authentication info for this new thread to be the same as that of
//the parent thread, to ensure this will work properly with OS
authentication
HANDLE hActivityThread = GetCurrentThread();
BOOL bRet = SetThreadToken( &hActivityThread,
pActivityThreadinfo->hToken );

if (!bRet)
{
// Couldn't set the authentication information for this thread
// Pass it back to the primary thread which will return it to the process
pActivityThreadinfo->m_nResult = ERR_AUTHENTICATION_FAILED;
return retval;
}

// End Code added to fix the NT Authentication Issue
TCHAR szDBPath[255];
TCHAR szAppPath[255];
CFDCProcCtrl* pWebActy = NULL;
CTimeSpan tSpan;

try
{
while (1)
{
if (!pfCloseWebActivityFile || !pfCheckWebActivityFile)
return 1;

for (int iCount = 0; iCount < vpProcCtrlList.size(); iCount++)
{
pWebActy = vpProcCtrlList[iCount];
CString sDBPath = pWebActy->GetDBPath();
_tcscpy(szAppPath, pActivityThreadinfo->m_sAppPath);
strcpy(szDBPath, sDBPath.GetBuffer(sDBPath.GetLength()));
if (pfCheckWebActivityFile(szAppPath, szDBPath) == 1)
{
pWebActy->TimeSpan(&tSpan);
if (tSpan.GetTotalSeconds() >= 30)
{
pfCloseWebActivityFile(szAppPath, szDBPath);
pWebActy->SetClose();
}
}
}
Sleep(6000);
}

}
catch(...)
{
CloseHandle(hActivityThread);
delete pActivityThreadinfo;
pActivityThreadinfo->m_nResult = ERR_CRL_EXCEPT;
}
CloseHandle(hActivityThread);
delete pActivityThreadinfo;
return 1;
}

==========================================================================

"John Maly" <johnmaly.DeleteThis@hotmail.com> wrote in message
news:e6ohBGuNEHA.556@TK2MSFTNGP10.phx.gbl...
 > Hi All,
 > We have a Web application built with ASP Code. The ASP Code in turn calls
 > VC++ dll through a COM Object. The Com Object spawns a worker thread
 > (thread-A). Then the worker thread spawns another thread (thread-B). The

There you go!
You never can be sure about the thread state of the parent process within
IIS. If IIS decides that a thread needs to be returned to the pool, you
really have a problem, you cannot get events on that.
Second, you play with your live when you go out of your COM apartment
within a process. It is against good COM programming practices , yes, you
can/could use a free threaded marshaler, but vbscript/IIS and all together,
it's not advised...

 > code in thread-B contains an infinite looping, so that the life of
Thread-B
 > lasts till IIS is Reset. In other words Thread-B runs as long as IIS runs.
 > But, after running like 5 or 10 minutes IIS crashes.
 >
 > IIS crashes because of the infinite loop which is purposely put in to
retain
 > the life of the thread till IIS is reset.
 > If I dont have the infinite loop, it does not crash...
 > Would appreciate any help on why IIS is crashing. I have included the IIS
 > message from Eevet Viewer and the code
 >
 > Thank you for your time,
 > - John
 > ==========================================================================
 > IIS Crash message from the Event Viewer (System) is as follows:
 > ==========================================================================
 > A process serving application pool 'DefaultAppPool' suffered a fatal
 > communication error with the World Wide Web Publishing Service. The
process
 > id was '3196'. The data field contains the error number.
 >
 > ==========================================================================
 > The code in the function which is passed to AfxBeginThread, is as
follows.
 > ==========================================================================
 > UINT WorkerThreadCheckWebReportFile(LPVOID pParam)
 > {
 >
 > UINT retval = 0;
 > CWorkerThreadInfo *pActivityThreadinfo;
 > pActivityThreadinfo = (CWorkerThreadInfo *)pParam;
 >
 > if (!pActivityThreadinfo)
 > return retval;
 >
 > //Set the authentication info for this new thread to be the same as that
of
 > //the parent thread, to ensure this will work properly with OS
 > authentication
 > HANDLE hActivityThread = GetCurrentThread();
 > BOOL bRet = SetThreadToken( &hActivityThread,
 > pActivityThreadinfo->hToken );
 >
 > if (!bRet)
 > {
 > // Couldn't set the authentication information for this thread
 > // Pass it back to the primary thread which will return it to the
process
 > pActivityThreadinfo->m_nResult = ERR_AUTHENTICATION_FAILED;
 > return retval;
 > }
 >
 > // End Code added to fix the NT Authentication Issue
 > TCHAR szDBPath[255];
 > TCHAR szAppPath[255];
 > CFDCProcCtrl* pWebActy = NULL;
 > CTimeSpan tSpan;
 >
 > try
 > {
 > while (1)
 > {
 > if (!pfCloseWebActivityFile || !pfCheckWebActivityFile)
 > return 1;
 >
 > for (int iCount = 0; iCount < vpProcCtrlList.size(); iCount++)
 > {
 > pWebActy = vpProcCtrlList[iCount];
 > CString sDBPath = pWebActy->GetDBPath();
 > _tcscpy(szAppPath, pActivityThreadinfo->m_sAppPath);
 > strcpy(szDBPath, sDBPath.GetBuffer(sDBPath.GetLength()));
 > if (pfCheckWebActivityFile(szAppPath, szDBPath) == 1)
 > {
 > pWebActy->TimeSpan(&tSpan);
 > if (tSpan.GetTotalSeconds() >= 30)
 > {
 > pfCloseWebActivityFile(szAppPath, szDBPath);
 > pWebActy->SetClose();
 > }
 > }
 > }
 > Sleep(6000);
 > }
 >
 > }
 > catch(...)
 > {
 > CloseHandle(hActivityThread);
 > delete pActivityThreadinfo;
 > pActivityThreadinfo->m_nResult = ERR_CRL_EXCEPT;
 > }
 > CloseHandle(hActivityThread);
 > delete pActivityThreadinfo;
 > return 1;
 > }
 >
 > ==========================================================================
 >
 ><!-- ~MESSAGE_AFTER~ -->