session-04

04. Concurrency

This lecture provides a background on the OS process abstraction. It then introduces the concept of concurrency and concurrent programming. Finally it presents Go's CSP concept using several examples in Go.

Outline

1. Processes and Threads
   • OS Basics
   • Synchronization Mechanisms
2. Concurrency
3. Concurrent Design in Go
4. goroutines and channels
5. Examples
   • Load Balancer
   • Query a Replicated Database
6. Beyond Single Nodes

Slides

Readings

• Go Web Programming chapter 9
• Hoare, C. A. R. (1978). "Communicating sequential processes". Communications of the ACM.

Questions

1. What is the difference (besides the syntax) of the concurrency model presented in Hoare's paper and the one implemented in Go?
2. Investigate how the HTTP server in Go is implemented. How does it handle multiple requests?

Hands-on

1. Hands-on-01

Further Readings

• Herb Sutter (2005). The Free Lunch Is Over: A Fundamental Turn Toward Concurrency in Software
• Herb Sutter (2012). Welcome to the Jungle

On Concurrency in Go

• https://blog.golang.org/context
• https://blog.golang.org/pipelines
• https://blog.golang.org/advanced-go-concurrency-patterns
• https://blog.golang.org/share-memory-by-communicating
• https://blog.golang.org/go-concurrency-patterns-timing-out-and