1. CGS 3763 Operating Systems Concepts Spring 2013
Dan C. Marinescu
Office: HEC 304
Office hours: M-Wd 11: :30 AM

2. Lecture 6 – Friday, January 18, 2013
Last time:
Abstractions; interpreter, storage, communication channel
Memory hierarchies.
Protection – user and kernel mode execution
Priviledged/non-privileged instructions
Today:
Kernel functions
System calls
The structure of a UNIX kernel
Examples of operating systems
Week in review – problems from chapter 2
Next time
Process; process state; a process in memory
Kernel data structures for process management
12/6/2018

3. Assignments Chapter 3 of the text book
Reading assignments:
Chapter 3 of the text book
The computer architecture material
HW1 due Wednesday
12/6/2018

4. Kernel functions Program execution: Input/Output operations:
Process management
Scheduling and resource allocation
Interrupt handling:
Error handling
Input/Output operations:
Storage management - file system manipulation:
Security enforcement
Accounting
12/6/2018

5. System calls Process control File management Device management
Load
Execute
Create, terminate a process
Block a process, abort
Get process attributes/set process attributes
Allocate/deallocate memory for a process
File management
Create/Delete file
Open/Close file
Read/Write file
Get/Set file attributes
Device management
Information maintenace
12/6/2018

6. System calls (cont’d) Communication File management Device management
Create/Delete file
Open/Close file
Read/Write file
Get/Set file attributes
Device management
Request/Release device
Read from/Write to device
Get/Set device attributes
Information maintenance
Get/Set time/date
Get/Set attributes
Communication
Create/Delete communication connection
Send/Receive message
12/6/2018

7. Unix kernel
12/6/2018

8. Examples of operating systems
Multix – developed at MIT in mid 60s
Unix – develop at ATT by  Ken Thompson, Dennis Ritchie,  Brian Kernighan, Douglas McIlroy, Michael Lesk, and Joe Ossanna in 1969.
BSD-Unix developed at U. C. Berkeley 1977.
Mach – developed at Carnegie-Mellon in mid 1980s. It is a microkernel.
MAC OS X
12/6/2018

9. MAC OS-X
12/6/2018