[PDF] Operating Systems Notes Lecture PDF Download
Operating Systems Notes
Topics in our Operating Systems Notes PDF
In these “Operating Systems Notes PDF”, you will study the different types of operating systems. Operating system modules such as memory management, process management and file management are covered in detail.
The topics we will cover will be taken from the following list:
Introduction: Operating systems (OS) definition, Multi-programming and Time Sharing operating systems, real time OS, Multiprocessor operating systems, Multicore operating systems, Various computing environments.
Operating System Structures: Operating Systems services, System calls and System programs, operating system architecture (Micro Kernel, client server) operating
Process Management: Process concept, Operation on processes, Multi-threaded processes and models, Multicore systems, Process scheduling algorithms, Process synchronization. The Critical-section problem and deadlock characterization, deadlock handling.
Memory Management: Physical and Logical address space; Memory allocation strategies – Fixed and Variable Partitions, Paging, Segmentation, Demand Paging and virtual memory, Page Replacement algorithm.
File and I/O Management: Directory structure, File access methods, Disk scheduling algorithms.
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Operating Systems Handwritten Notes PDF Contributor: Abhishek Sharma College: KMV (DU)
An operating system (OS) is system software that manages computer hardware, software resources, and provides common services for computer programs. Some popular Operating Systems include Linux Operating System, Windows Operating System, VMS, OS/400, AIX, z/OS, etc.
What are the functions of Operating Systems ?
Control over system performance
Error detecting aids
Coordination between other software and users
What are the types of Operating Systems ?
Batch OS: A set of similar jobs are stored in the main memory for execution. A job gets assigned to the CPU, only when the execution of the previous job completes.
Multi-programming OS: The main memory consists of jobs waiting for CPU time. The OS selects one of the processes and assigns it to the CPU. Whenever the executing process needs to wait for any other operation (like I/O), the OS selects another process from the job queue and assigns it to the CPU. This way, the CPU is never kept idle and the user gets the flavor of getting multiple tasks done at once.
Multitasking OS: Multitasking OS combines the benefits of Multi-programming OS and CPU scheduling to perform quick switches between jobs. The switch is so quick that the user can interact with each program as it runs.
Time Sharing OS: Time-sharing systems require interaction with the user to instruct the OS to perform various tasks. The OS responds with an output. The instructions are usually given through an input device like the keyboard.
Real Time OS: Real-Time OS are usually built for dedicated systems to accomplish a specific set of tasks within deadlines.
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