ThreadId

Is there a way from within an object that I can return the thread id
of the thread using that object, other than passing the thread's
handle all the way down to the object I am interested in.

I have a class that will be instantiated and used from within the
context of several threads, and I want to know which thread is
accessing it at a given time so I can log that information to disk.
It must be available because the call stack has that information.

Thanks.

Mike