STRUCTURE OF OPERATING SYSTEMS
- 1. OS STRUCTURE
- 3. APPLICATION PROGRAM Application programs are used to perform specific tasks for users. Application software runs on top of system software. (Ex) Ms-word, Ms-excel, powerpoint, access etc.
- 4. SYSTEM PROGRAM System programs are computer programs that provide platform for application programs to work. Without the system software also called operating system, the computer system cannot work. (Ex) Any OS
- 5. DEFINITION A device driver is a small piece of software that tells the operating system and other software how to communicate with a piece of hardware. Without drivers, the computer would not be able to send and receive data correctly to hardware devices, such as a printer. .
- 7. EXAMPLE OF DEVICE DRIVERS (Ex) Printer drivers tell the operating system, and by extension whatever program you have the thing you want to print open in, exactly how to print information on the page.
- 9. ANDROID OS
- 10. ANDROID Android is a Linux-based operating system designed primarily for touchscreen mobile devices such as smartphones and tablets. The first Android-powered phone was sold in October 2008.
- 11. FEATURES OF ANDROID User gets millions of applications that user can not get in any other mobile operating system. (Google Play Store). Android supports advanced audio/video/still media formats such as MPEG-4, H.264, MP3, and AAC, AMR, JPEG, PNG, GIF.
- 12. It has several Pre – Installed applications like Gmail, Maps etc. It provides RDBMS SQLITE for data storage and data sharing for various applications. No need to get permission from Third party developers
- 13. STRUCTURE OF ANDROID OS
- 15. APPLICATION FRAMEWORK It is used to implement a standard structure for different applications. So that programmer can make easy use of it. Notifications Manager − Allows applications to display alerts and notifications to the user. Resource Manager − Provides access to color settings and user interface layouts. Activity Manager − Controls all aspects of the application lifecycle and activity stack.
- 16. LIBRARIES android.widget − A rich collection of pre-built user interface components such as buttons, labels, list views, layout managers, radio buttons etc. android.os − Provides applications with access to standard operating system
- 17. LIBRARIES android.database − Used to access data published by content providers and includes SQLite database management classes
- 18. RUNTIME A key component called Dalvik Virtual Machine which is a kind of Java Virtual Machine specially designed and optimized for Android. Dalvik translates a Java program into machine code of mobile device.
- 19. KERNEL It is the heart of android architecture that exists at the root of android architecture. Linux kernel is responsible for device drivers, power management, memory management, device management and resource access.
- 20. iOS
- 21. Market share Market Share 2015 Second mobile OS in usage First mobile OS in revenue
- 22. ABOUT IOS iOS (originally iPhone OS) is a mobile operating system created and developed by Apple. It is the second most popular mobile operating system in the world by sales, after Android.
- 23. iOS STRUCTURE
- 24. COCOA TOUCH LAYER The Cocoa Touch layer define the appearance of your app. They also provide the basic app infrastructure and support for key technologies such as multitasking, touch-based input, push notifications
- 25. MEDIA LAYER The Media layer contains the graphics, audio, and video technologies you use to implement multimedia experiences in your apps.
- 26. CORE SERVICES LAYER The Core Services layer contains fundamental system services for apps Features such as location, iCloud, social media, and networking.
- 27. CORE OS LAYER • File-system access • Standard I/O • Memory allocation
Editor's Notes
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