My application is not working when it is minimised in iPhone 4

What should I do to rum my application continuously in the background e开发者_如何学Cven though it is minimised? Right now my app is running on mainthread itself. Do I need to create one more thread and need to run my logic on that thread?

Only certain types of background tasks are allowed in iOS (audio, location, and VoIP, plus "task completion" and notifications) — detailed information can be found in the iOS Application Programming Guide.