Week 9

Channels, CSP, and Go

Continuing from where we left off last week

Monday: class canceled (Marc at Dome)

Assignment: Dining Java Philosophers

Assign 4
- PDF
- questions?
- due: Fri, Nov 2, 11:59pm (deadline extended!)

Channels (cont'd)

CSP and Go!
Hoare's 1978 CSP paper: https://spinroot.com/courses/summer/Papers/hoare_1978.pdf
- Go implementation of examples from paper: https://godoc.org/github.com/thomas11/csp
Rob Pike's Google I/O 2012 - Go Concurrency Patterns: https://youtu.be/f6kdp27TYZs
Peter Welch's slides (in occam, but we will use Go this semester!)
- Occam-pi Lecture Notes
- Legoland: slide 83-end of basics.pdf

Demo and codewalk of csp-dining-philosophers.go
- Go language features highlighted:
  - channels
  - select
- Design basis for solution in Go: go routines (processes)
  - room (communicates with philosophers over channels)
    - for philosophers to enter/leave – at most 4 at a time to prevent deadlocking, 5th philosopher blocks
  - forks (communicate with philosophers over channels)
  - philosophers (communicate with forks over channels)