Operating system and its uses
- 2. AGENDA • OPERATING SYSTEM • FUNCTION AND COMPONENT OF OS • TYPES OF OS • PROCESS AND PROGRAM • REAL TIME OPERATING SYSTEM
- 3. What is an operating system (OS): An operating system is a collection of software that manages computer hardware resources and provides common services for computer programs. The operating system is a vital component of the system software in computer system.
- 5. • MANAGING RESOURCES • PROVIDING A USER INTERFACES • RUNNING APPLICATIONS • SUPPORT FOR BUILT IN UTILITY PROGRAMS • CONTROL TO THE COMPUTER HARDWARE.
- 6. • PROCESS MANAGEMENT • MEMORY MANAGEMENT • I/O DEVICE MANAGEMENT • FILE SYSTEM • PROTECTION • NETWORK MANAGEMENT • NETWORK SERVICES • USER INTERFACE
- 9. • REAL TIME OPERATING SYSTEM. • SINGLE USER,SINGLE TASK • SINGLE USER ,MULTI TASKING • MULTI USER ,MULTI TASKING.
- 10. FEATURES OF OPERATING SYSTEM • RELIABLE • OPERATIONAL AT ALL TIMES • SHOULD COORDINATE AND HAVE GOOD CONTROL OF INPUT AND OUTPUT OPERATIONS AND THE DEVICES ON WHICH THEY ARE PERFORM. • ENHANCE TIME SHARING
- 12. EXAMPLES OF COMPUTING DEVICES WHICH USE OS • COMPUTERS • MOBLIE PHONES • 3D TELEVISION • VIDEO GAME • ATM • TICKET WENDING MACHINE
- 13. ADVANTAGES OF OS • EASY TO USE • USER FRIENDLY • INTERMEDIATE BETWEEN ALL HARDWARE’S AND SOFTWARE’S OF THE SYSTEM • NO NEED TO KNOW ANY TECHNICAL LANGUAGES • IT’S THE PLATFORM OF ALL PROGRAMS
- 14. DISADVANTAGES • IF ANY PROBLEMS AFFECTED IN OS ,YOU MAY LOSE ALL THE CONTENTS WHICH HAVE BEEN STORED ALREADY • UNWANTED USER CAN USE YOUR OWN SYSTEM
- 15. MULTITHREADING
- 16. PROCESS AND PROGRAM • A PROCESS INVOKES OR INITIATES A PROGRAMS .IT IS AN INSTANCE OF A PROGRAM THAT CAN BE MULTIPLE AND RUNNING THE SAME APPLICATION. • EXAMPLE:NOTEPAD IS ONE PROGRAM AND CAN BE OPENED TWICE.
- 17. SERVER NEEDS
- 18. REAL TIME OPERATING SYSTEM • AN OPERATING SYSTEM (OS)INTENDED TO SERVE REAL APPLICATION REQUESTION REQUESTS • AN RTOS HAS AN ADVANCED ALGORITHM FOR SCHEDULING .
- 19. ALGORITHMS USED IN RTOS • COOPERATIVE SCHEDULING • PREEMTIVE SCHEDULING 1. RATE MONOTONIC SCEDULING 2. ROUND ROBIN SCHEDULING 3. FIXED PRIORITY PRE EMPTIVE SCHEDULING ,AND IMPLEMENTATION OF PREEMPTIVE TIME SLICING 4. FIXED PRIORITY SCHEDULING WITH DEFEERED PREEMPTION 5. FIXED PRIORITY NON PREEMPTIVE SCHEDULING 6. CRITICAL SECTION PREEMPTIVE SCHEDULING 7. STATIC TIME SCHEDULING
- 20. SCHEDULING IN RTOS • RUNNING (EXECUTING CPU) • READY (READY FOR EXECUTION) • BLOCKED(WAITING FOR AN EVENT,I/O FOR EXAMPLE)
- 21. SCHEDULING
- 22. HOW RTOS IS DIFFERENT? • THE KEY DIFFERENCE BETWEEN GENERAL COMPUTING OPERATING SYSTEMS AND REAL TIME OPERATING SYSTEMS IS NEED FOR”DETERMINISIC” TIMING BEHAVIOUR ,GENERAL COMPUTING NON REAL TIME OPERATING SYSTEM ARE OFTEN QUITE NON DETERMINISIC • REAL TIME OPERATING SYSTEMS ARE OFTEN USES IN EMBEDDED SOLUTIONS,THAT IS,COMPUTING PLATFORMS THAT ARE WITHIN ANOTHER DEVICE .WHILE REAL TIME OPERATING SYTEMS ARE TYPICALLY DESIGNED FOR AND USED WITH EMBEDDED SYSTEMS.
- 23. SYNCHRONIZATION
- 24. PROCESS STATES FOR TIME SHARING