CSC520 by MUHAMMAD NUR ARIF MOHD AZMAN https://padlet.com/2021619936/4m3iy0ay2kpi8ma8 Chapter 1 and Chapter 2 en-us 2021-10-25 07:24:13 UTC 2024-07-31 07:43:12 UTC hello@padlet.com https://3.bp.blogspot.com/-nRZTj1XE4Vo/XQ1BJ-tYcMI/AAAAAAAAAnA/YRWsXMd2bzEH4idnF1HXMhkIGOwkR6wTgCK4BGAYYCw/s1600/ryzen_3000_cpus_lede_2.10.jpg Chapter 1 : Introduction 2021619936 https://padlet.com/2021619936/4m3iy0ay2kpi8ma8/wish/1840921995 Operating System 

  •  A computer program that acts as an intermediary between a user of a computer and the computer hardware.
 
 
Computer System Structure


  • Users                        - People, machines, other computer
  • Application                - Software, web browsers
  • Operating System     - control and coordinates use of hardware
  • Hardware                  - CPU, memory, I/O devices
 
 
User view


 
  • Single user computers - ease of use, good performance. 

  • Multi user computers - maximize resource utilization.

  • Handheld computers - optimized for usability and battery life.
  • Embedded computers - run without user intervention. 
 

    System View

  • Resource allocator 
     
    • manages all resources.
  •  
    • Decides between conflicting requests for efficient and fair resource use.
  •  
  • Control program 
     
    • Control execution of programs to prevent errors and improper use of the computer
]]> 2021-10-25 07:31:28 UTC https://padlet.com/2021619936/4m3iy0ay2kpi8ma8/wish/1840921995 Topic 2 : Operating System Structures 2021619936 https://padlet.com/2021619936/4m3iy0ay2kpi8ma8/wish/1840974236 Function of OS :-
1) User interface (UI) (Command-Line (CLI), Graphics User Interface (GUI),  touch-screen)
2) Program execution
3) I/O operations
4) File-system manipulation
5) Communications
6) Error detection

Another set of OS functions for ensuring the efficient operation via resource sharing :-
1) Resource allocation
2) Logging
3) Protection and security

System Calls:-
- Services provided by the OS
- Written in high-level language (C or C++)
- Access by API

Types of System Calls
- Process control
- File management
- Device management
- Information maintanance
- Communications
- Protection

System Services :-
1) File manipulation 
2) Status information sometimes stored in a file
3) Programming language support
4) Program loading and execution
5) Communications
6) Background services
7) Application programs

]]> 2021-10-25 07:59:41 UTC https://padlet.com/2021619936/4m3iy0ay2kpi8ma8/wish/1840974236 Profile 2021619936 https://padlet.com/2021619936/4m3iy0ay2kpi8ma8/wish/1847540196 Name : Muhammad Nur Arif Bin Mohd Azman
ID : 2021619936
Group : CS2303C]]> 2021-10-27 08:04:56 UTC https://padlet.com/2021619936/4m3iy0ay2kpi8ma8/wish/1847540196 Chapter 3 : Processes 2021619936 https://padlet.com/2021619936/4m3iy0ay2kpi8ma8/wish/1848989567 Process Concept : -
- process execution must progress in sequential fashion multiple parts such as text section, program counter, stack, data section and heap (memory location).

1) Process State :
- Start with new (the process is being created) --> ready (wait for CPU to be assign) --> running (instructions are being executed) --> waiting (the process is waiting for some event to occur) --> termination (completion of the process).
2) Process Control Block (PCB) :


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