Sånn i forlengelsen; er det slik at alle disse programmene ligger og suger batteri, egentlig?
Sånn ca slik.
Under the Hood
Apple claims their multitasking will save battery life and resources, unlike the competition. But how?
The reason is simple: This is not 100% true multitasking. Not in the sense that developers define it: All system resources are available to all applications, with the system assuming the role of a traffic controller, giving preference to some tasks and less preference to others as needed.
Free-for-all multitasking will consume way too many resources, especially memory. This will make the system choke, given the limited memory available in these devices. The CPU would also be taxed, and it would deplete the battery life quicker while slowing down applications running on the foreground.
Apple's method, however, is quite clever: Basically, it allows you to pause applicationslike you can pause them in any UNIX-based operating system, while enabling some special services to allow some types of taskslike receiving calls or playing musicto run on the background. There are seven kinds of services, and Apple says these will give the user the kind of multitasking they demand, but without choking the system:
Edit: http://gizmodo.com/5512656/how-multitasking-works-in-the-new-iphone-os-40