profiling multi threaded applications

I was about to add a simple profiler into our engine, but I've just 
realized that the usual hierarchical profiler that measures the time for 
a chunk of code won't cut it, in a multithreaded application.

I understand that even when I have a single threaded app, there are 
usually several other applications are running in the background, but 
mostly they are all idle, so it's just noise. But in this case, I would 
have multiple, heavily working threads. If the OS switches back and 
forth between these threads all the time, then how is it possible to 
make accurate, or even just usable measurements??

Thanks,

Andras


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