Thread Viewer question

Hi,

I've been using the Thread Viewer
(Developer->Applications->Performance Tools) to analyze the performance
of an applicaton. The multithreaded app is running in XCode 2.1
debugger and via the Viewer I can see one thread is running much more
than the others. I would like to examine this thread in the debugger
in detail but how do I map from the Mach Thread number in the Thread
Viewer to the Pthreads displayed in the XCode debugger ?

I can see that thread 04d07 is consuming a lot of cycles but the
debugger only shows threads as 1-23. Also the way this app is
structured ALL the threads run the same base thread code so I cannot
look at the stack snap shots in the Viewer to guess which pthread it
might be.

Is there something inside the pthread structure that has the Mach
thread number ? I can stop the app in the debugger and I do have the
pthread data structure to look at. If I have to look at each one it's
not a big deal but if you know where to look in the structure it would
help a great deal. Thanks.

--jim

And another thing... I've tried calling pthread_mach_thread_np() and
putting that value into my data structure. This is supposed to be the
kernel thread (Mach thread) under the pthread. This value doesn't seem
to match anything in Thread Viewer. I've been looking at the source of
Libc-391.2.3 from Darwin (pthread source is here). And it does put the
Mach thread value into the struct when it creates the thread and
pthread_mach_thread_np() will get it back.

So the question I have now is, what are the values shown in Thread
Viewer ?

--jim