Multitasking has always been a piece of cake for laptops, computers and even netbooks. However, when it comes to the smaller gadgets, like the smartphones, there are plenty of other factors that need to be considered before letting them multi-task like the laptops and PCs.
Why? Here goes…
Laptops and computers have enough space to house powerful processors and large RAMs, to enable them to multi-task with ease. The smartphones, being smaller in size, have restrictions on the processor and the RAM that they incorporate within them. Even if a powerful processor and a capacious RAM are housed within, problems crop up with battery life. The multi-tasking might drain out battery very soon, which spoils the whole idea of owning a mobile phone.
However, smartphone multitasking is offered, but with a difference. In laptops, applications and programs can run in the background. Even if the user is looking at one particular app, there will be many other apps running behind the scenes. Thus, you can download a file, listen to music, let your email and social networks update themselves and more at the same time.
In smartphones, when a user switches from one application to another, the background app is paused. It will remain in the memory (RAM), but without doing anything. When the user switches back to the background app, it will resume from where it was left. Then again, if there are too many background apps open, then the operating systems are designed in such a way that, some apps are suspended. Usually, those apps that have not been visited for a long time are suspended. This means that, their current states are saved and they are terminated from the memory. This frees up space in the RAM for better functioning. When the user switches back to the app which has been suspended, its state is restored and the user will be able to resume from where he had left it.
This is basically how mobile phone multitasking works in most platforms. Windows Phone 7 multitasking is also based on this logic. Very few apps are allowed to run even in the background, when the user is working on something else in the foreground. Downloading of files, playing music using a native music player etc are some examples. However, there’s an extension to background apps in Android multitasking. Google allows true multitasking even with third party apps. Apps which need to run in the background should have something called as a service. This service will perform the same tasks as the app itself, but it will lack a user interface. It will thus run in the background. The app and the service work as a client-server model. Many apps use this model for their functioning and hence enable multitasking.
However, this kind of multi-tasking takes a toll on the battery life of the device as mentioned earlier. Therefore multi-tasking and battery life come as trade-offs.
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