Diagrams

Question 1

Draw the Multithreaded web server diagram.

Answer 1

Should include the following captions in an anti-clockwise rotation:
- Web server process
- Dispatcher thread
- Network connection
- Kernel
- Kernel Space
- Web page cache
- Worker thread
- User space

Question 2

Draw the functioning of a system call diagram.

Answer 2

Should include the following captions in order:
1. Push nbytes
2. Push &buffer
3. Push fd
4. Call read
5. Put Code for read in register
6. Trap to kernel
7. Dispatch
8. [no tag just a radiator-looking thing]
9. Sys call handler
10. Return to caller
11. Increment SP

Question 3

Draw a functioning paging system for virtual memory

Answer 3

Should include 10 steps, take notice of 4.1 going to 5.1 and 4.2 going to 5.2 and 5.3 going to HDD

Question 4

Draw the file system layout diagram.

Answer 4

Include:
- Entire Disk

• MBR
• Partition Table
• Disk partition

-Boot block
- Superblock
- Free space mgmt
- I-nodes
- Root dir
- Files and directories

Question 5

Draw the DMA network device/USB device diagram

Answer 5

Include the 3 different transition steps

The CPU, DMA controller, Disk controller, and main memory