What does it happen if killing app then fast startup?

Ask this question dues to my app is very likely to crash if I kill the app  then restart it very fast.  My debugging shows that when you double click back button then kill app, you see app really disappear, in fact it is still running, needs some time to exit completely. Then if you start up it very fast, app will re-access original dying app, instead of launch a new process, then it will be very likely to crash.
It is not difficult to reproduce it on either device or simulator, the reason is my app running under heavy thread pool (C++ boost implementation), normally it will need some time to destroy the pool (waiting all working threads to join).
I am not sure whether it is system behavior? Does user need to wait for a few seconds after killing app?  Or how can I avoid it on application layer?  Thank you.

You've posted your question in the iPhoto for iOS forum, but iPhoto for iOS is not compatible with an iPod touch. Are you trying to "edit" an album in the the Photos application?
-Doug

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