Definition
An operating
system is a program that acts as an interface between the user and the computer
hardware and controls the execution of all kinds of programs.
Following are some of
important functions of an operating System.
- Memory Management
- Processor Management
- Device Management
- File Management
- Security
- Control over system performance
- Job accounting
- Error detecting aids
- Coordination between other
software and users
Memory Management
·
Keeps tracks of primary memory, i.e., what part of it are in use
by whom, what part are not in use.
·
In multiprogramming, the OS decides which process will get memory
when and how much.
·
Allocates the memory when a process requests it to do so.
·
De-allocates the memory when a process no longer needs it or has
been terminated.
Processor Management
·
Keeps tracks of processor and status of process. The program
responsible for this task is known as traffic controller.
·
Allocates the processor (CPU) to a process.
·
De-allocates processor when a process is no longer required.
Device Management
·
Keeps tracks of all devices. Program responsible for this task is
known as the I/O controller.
·
Decides which process gets the device when and for how much time.
·
Allocates the device in the efficient way.
·
De-allocates devices.
File Management
·
Keeps track of information, location, uses, status etc. The
collective facilities are often known as file system.
·
Decides who gets the resources.
·
Allocates the resources.
·
De-allocates the resources.
Other Important Activities
·
Security − By means of password and similar other techniques, it
prevents unauthorized access to programs and data.
·
Control over system performance − Recording delays between request for
a service and response from the system.
·
Job accounting − Keeping track of time and resources used by various jobs
and users.
·
Error detecting aids − Production of dumps, traces, error messages, and other
debugging and error detecting aids.
·
Coordination between other softwares and users − Coordination and
assignment of compilers, interpreters, assemblers and other software to the
various users of the computer systems.
What is
Mobile Operating System ?
Mobile
Operating system is much like the windows or other computer operating systems,
It supports all the operations of the phone, it supports all the software that
can run on the phone, it is like providing a platform for all the software to
run upon.
An
operating system performs all operations like the phone call, messaging, email,
keyboard, files manage etc.
All
the apps of the Mobile device are stored and managed by the operating system.
Complete List of Operating System of mobile phone
Here is the list of the mobile operating system, and a link in detail about them.
1. Symbian Mobile Operating System
2. Android Operating System
3. IOS Operating System
4. BlackBerry Operating System
5. WebOS Operating System
6. MeeGo Operating System
7. Bada Operating System
8. Windows Phone Operating System
9. Maemo Operating System
10. Palm Operating System
11. Sailfish Operating System
12. Tizen Operating System
13. Ubuntu Touch Operating System
14. QNX Operating System
15. Fire Operating System
16. Yun Operating System
17. Nokia Asha platform Operating System
18. Lune Operating System
19. MIUI Operating System
Taskbar
The taskbar is an element of an operating system located at the bottom of the screen. It allows you to locate and launch programs through Start and the Start menu, or view any program that's currently open. On the right side of the taskbar is the Notification Area that allows you to check the date and time, items running in the background. The taskbar first introduced with Microsoft Windows 95 and is found in all subsequent versions of Windows.
The picture above shows the Windows taskbar throughout Windows history. Except for the Quick Launch feature, the taskbar in Windows 95, 98, ME, NT 4.0 resembled the Windows 98 taskbar. With the release of Windows Vista and 7, Microsoft removed the Quick Launch, added the Start Orb, and allowed icons in the Windows Notification Area to be hidden. With Windows 8, Microsoft removed the Start button, but later added it back in Windows 8.1. Windows 10 resembles Windows 8.1, but with a new Cortana search box. Below is an overview of the Microsoft Windows 10 taskbar with each of its major elements listed.
Running an Application
Before you can begin debugging your application, you need to run it. If your application requires arguments, you can enter the arguments when you open the executable, in the Open Executable dialog box, or you can enter it in the Run or Rerun With Arguments dialog box.
To run an application, choose one of the following:
- Select Run > Run or Continue or click the
Run or Continue button. - If you need to enter arguments, select Run > Restart With Arguments ....
- Enter the run command in the Console window.
The application begins running and the debugger creates and executes a new process.
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