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Retrieves a pointer to the filter-critical section.
CCritSec* pStateLock(void);
Return Values
Returns the critical section.
Remarks
Locking consists of holding the filter-critical section by calling the pStateLockmember function and using the returned object to serialize access to functions. Typically, this lock can be held by a function when the worker thread might want to hold it. Therefore, to access a shared state from the worker thread, add another critical-section object. The exception occurs during the processing loop of the thread when it is safe to retrieve the filter-critical section from within CSourceStream::FillBuffer.