Intro to OS and Processes

A kernel

• Implements the basic functionality of the operating system

• Is always resident in memory

• Implements all functionality of the operating system

• Implements the file system, memory management and job scheduling

The operating system

• Manages the resources of the computer

• Provides the user an interface to the resources

• Resides in the kernel

• Runs in kernel space

Mechanism used by the OS to signal the system that a high-priority event has happened

• Interrupt

• Signal

• Kernel Panic

• Blue Screen of Death

A large driver of interrupts is

• The file system

• I/O

• The kernel

• The TLB

The data structure used for handling interrupts

• Interrupt Descriptor Table

• Interrupt Map

• Vector Resource Table

• Do Not Disturb Sign

A process is

• A program in execution

• A list of steps to complete a task

• A passive collection of instructions

• A passive collection of instructions

A program is

• A process in execution

• A sequence of instructions written to perform a specified task

• An executing task

• A sequence of instruction held within the task table

fork returns

• 0 to the child

• 0 to the parent

• A non-zero value to the child

• A non-zero value to the parent

Kernel mode is in ring

• 0

• 1

• 2

• 3

User mode is in ring

• 0

• 1

• 2

• 3