How attach code to a running iphone app

I am trying to fix a random hang in my iphone app. I could not regenerate the hang from launching it from 开发者_Go百科the xcode. Is their any way to attach xcode debugger, as soon as I detect the hang? (I can attach it to 'instruments') but it did not much help.

No, you can't connect gdb to an already-running iPhone process. This may be possible if you jailbreak the phone.