Thread in driver

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Actually I would like to create a driver which I can pass a function
pointer in. And the driver is able to do the callback whenever there
is an interrupt. Here is my program...

File Driver_Main.c

void SomeISTThread()
{
while (TRUE)
{
/* Wait for the application event to be released */
WaitForSingleObject(Somevent, INFINITE);
Callback();
InterruptDone(SomeIntr);
}
}

BOOL WINAPI DllEntry(HANDLE hInstDll, DWORD dwReason, LPVOID
lpvReserved)
{
SomeThread = CreateThread(NULL, 0,
(LPTHREAD_START_ROUTINE)SomeISTThread,
NULL, 0, NULL);
return TRUE;
}

File Callback.c

PVOID callback_function = NULL;

void Callback()
{
if (callback_function != NULL)
callback_function();
}

void Add_Callback(PVOID callback)
{
callback_function = callback;
}

BOOL Is_CallbackExist()
{
return (callback_function != 0);
}

In debug mode I can see that my callback pointer is passed into the
driver. I can call the callback from the driver. However when an
interrupt is triggered. The function Callback reported that the
callback_function is NULL (which I saw the same result from debug
mode).

P.S. I already passed a function pointer in the variable
callback_function. And I am able to call the callback function from my
application program.

Thanks for the help
.

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