Operating Systems

The operating is the backbone of a computer system. It is composed of one or more programs that handle processes and their resource management.

Managing Resources

The most crucial system resource management tasks include:

• Processor Management (Scheduling)
• Memory Management
• File Management
• Device-Management (I/O)
• Task/Process Management

User Mode

Describes the restricted default state in which programs get executed. If access to resources is required the program can make a sys call which gets handled by the operating system.

Kernel Mode

This is the privileged state that allows the operating system to execute all machine instructions and access all hardware/system resources. It is important for managing critical tasks like Memory Management, Scheduling, and device driver operations.