thread count problem

FROM : Nick Rogers
DATE : Mon Apr 21 22:03:10 2008

hi,
when I run my cocoa app, Activity monitor shows it having 2 threads, 
and thats ok, cause I'm running one POSIX thread with the start of 
the app and which remains till the app is exited.
The problem is when I detach a new NSThread, from which I'm calling 
"performSelectorOnMainThread:" frequently, the thread count goes to 
4. and when this new NSThread finishes, the thread count comes to 3 
and not 2. And it stays 3.

Is there something wrong?
Shall I provide more details?

WIshes,
Nick