Monitoring info about running processes of an iPhone with Objective C

I'm developing an iPhone app with XCode. I want to track the running applications of the phone and the memory, CPU usage for each of them. Stil开发者_开发问答l I wasn't able to find a way to do this. Can anyone help me?

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Attach your iPhone to the Mac and "Profile" the app, selecting the Activity Monitor instrument. You should get the info you need from that.

EDIT: Changed 'PC' to 'Mac' (force of habit).