How Multitasking Works in the New iPhone OS 4.0

At last , multitasking is coming to theiPhone 3GS , iPod Touch ( 3rd Gen ) and iPad , allowing you to quickly switch between lotion , using one while others keep doing other task in the setting . This is how it works .

Original iPhones , 3 thou Ca n’t in full promote to iPhone group O 4

How Does It Work?

For the user , multitasking seems to work transparently and very quickly . According to Apple , you will be capable to switch between software instantly , while the software running on the foreground — taking over the screen — won’t have slowdown .

Using their method acting you will be capable to answer an incoming SMS , or chaffer with a friend , or answer a call , and then go back to keep play a game , just where you left it before swap to any of those tasks . Or you will be able to upload pic to Flickr but without having to keep the Flickr app subject , like you have to do now . In this shell , the Flickr program will keep uploading those photos while you go read your e-mail or check the atmospheric condition .

The user port to deal all the die hard apps is quite unsubdivided : Double - dawn the home button will open a tray showing all track covering . Switching to another running app is as wide-eyed as get across on it . It lick like the undertaking switch ginmill in Windows or Mac OS X.

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Real-Life Examples

Here ’s one example : In previous translation of the iPhone OS , if you are working on electronic mail and there ’s a connection to a entanglement varlet , clicking on that inter-group communication will open Safari and close Mail . Then , once you were done look out that web pageboy , you conclude Safari , get back to the main iPhone carte du jour , sink in on the Mail icon , and go back to your mail .

With iPhone oxygen 4 , Mail will keep running while Safari open . To go back to Mail , the user just involve to double - click the dwelling house button : A dock will then slide in from the bottom of the varlet , indicate the running apps . The Mail picture will be there , and clicking on it will outright get back to where you depart it .

Another proficient exercise is Skype : In previous versions , Skype necessitate to be undecided to receive calls . That makes it useless as a phone replacement . In iPhone OS 4 , Skype can keep running in the ground to receive calls . It does n’t weigh you are surfing the web or play a game : You will be able to pick up the call — switching instantly to Skype — have a conversation for as long as you need , and then return to your web browser or game just where you left it .

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While scarper on the background , apps can do a lot more than that . An program like Pandora , for example , will be capable to keep playing music when you are not actively in it . The music playback will run in the background signal , just like the iPod portion of your iPhone , iPod touch , and iPad does .

Under the Hood

Apple claims their multitasking will save battery life and resources , unlike the contest . 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 don the office of a traffic accountant , giving taste to some tasks and less preference to others as require .

Free - for - all multitasking will ingest right smart too many resources , peculiarly memory . This will make the scheme choke , fall in the special memory uncommitted 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 .

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Apple ’s method acting , however , is quite cagy : Basically , it allows you to intermit applications programme — like you may break them in any UNIX - establish operating system , while enable some particular services to allow some types of tasks — like receiving calls or playing music — to run on the background . There are seven sort of services , and Apple says these will give the user the kind of multitasking they demand , but without choking the system :

• The first one is obvious : Background audio for apps like Pandora — and hopefully Spotify — is a must for consumer , who demand other music sources beyond iTunes . It ’s good to see that Apple is occupy this area into account specifically , just like they permit services like Netflix on the iPad .

• Voice - over - IP services , for applications like Skype , are also coherent , and another matter that consumers take . Until now , VoIP covering were limited because they could n’t receive song when they were not active . The developer can even apply custom vocalize for notice .

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• Background location works at two levels , leave positioning lotion to be mindful of your whereabouts , even if you do n’t have the app loose . Applications like TomTom would run this service in the ground , so you may face at other apps while the GPS still tracks where you are . When it ’s time to take a spell in your planned road , TomTom will tell you using the backcloth audio recording service . All without having to leave whatever package you are running in the foreground .

It mold similarly with other non - GPS apps that need locating services in a less active way than a driving app like TomTom . Those apps can use 3 G cell - towboat triangulation to know exactly where you are , alarm you of friends proximity or matter happening around you .

• Push notification was a backdrop task already , but it has been expanded . The iPhone now also supports local notifications . These notifications are generated by the iPhone apps : If a manipulate app has a timer , for example , it will be able to alert you when your roasted chicken is done .

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• Task completion will allow practical app to finish any tasks started before switching to another app . If you are sending or receiving a file in one app , you would be able to switch to another app , and that file will keep downloading .

• Fast app switching will make all running game apps in a flash uncommitted . Rather than having to jump them up each time , like now , the apps in iPhone o 4.0 will be capable to sleep , ready to be awaken at the mouse click of an icon in the running apps tray .

Basically , what Apple has done is to figure out all the complaining from users who wanted to do several things at the same meter . While this is not 100 % multitasking , in the traditional background good sense , it ’s a good affair . Consumers wo n’t care about full multitasking if it really works like this . It ’s all a matter of perceptual experience and being capable to do what you want to do , as fast as potential , while observe the sense of speed and a long battery living .

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