Sean Barker

Monolithic Kernel Design

1

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Layered OS Design

2

User programs

Device drivers

Virtual memory

I/O channel

CPU scheduler

Hardware

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Microkernel Design

3

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Hybrid Design in Mac OS

4

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Modular Design

5

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Processes

6

Memory

I/O

Processor Processes, scheduling, synchronization

Allocation, protection, virtual memory

Disk management, filesystems, networking

Hardware OS Services

Sean Barker

Process Execution States

7

Process State

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Process Control Block (PCB)

8

Process Control Block (PCB)

Process State

PC

CPU registers

CPU scheduling info

List of open files

...

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State Queues

9

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Context Switching

10

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Process Creation

11

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Process Communication

12

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Summary: Processes

•Execution state of a program

•Lifecycle states

•OS representation

•Creation

•Communication

13