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How is iPad/iPhone multitasking implemented ? How is this implemented at the language level? I have read freeze dried anyone knows the details?

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use this method to implement

  • (void)applicationDidEnterBackground:(UIApplication *)application
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Read the question again—he's not asking about how to use multitasking in an app, he's asking how the “freezing” stuff actually works behind the scenes. –  Noah Witherspoon Dec 7 '10 at 14:25
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You can never know these things for sure as the OS is not open source, having said that it seems plausible that it is similar to the unix command kill -STOP

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