Slides: Event-Based Concurrency

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# Event-Based Concurrency
## CSC 213 – November 14, 2025

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# Agenda for Today
1. Department Events
2. Upcoming Work
3. Event-Based Concurrency
4. Wrap Up

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# Department Events

## Faculty Candidate Talks
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  Happening now! Watch for emails about timing and topics.
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*To receive 0.25% extra credit, send an email to let me know you attended no more than 48 hours after the event.*

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# Upcoming Work

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# Lab: Sudoku Solver
**Due:** Friday, November 14th by 11:59pm  
**Late Deadline:** Friday, November 21st by 11:59pm

## Q&A
***What are some good debugging strategies?***  
Try turning off parts of your kernel, or run the kernel for just one iteration before returning the boards to the CPU to print with `print_boards`.
You can learn a lot by looking at home the kernel fills in cells one round at a time.

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# Reading Journal: Lampson's Hints for System Design
**Due:** Monday, November 17th one hour before class

Butler Lampson—Turing Award winner and accomplished system builder—has some hints for building systems.
Read and reflect on those hints to prepare for our end-of-semester project.

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# Event-Based Concurrency

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# Discussion: Models of Concurrency
**Questions for think, pair, share:**

1. What is the difference between event-based concurrency and the thread-based models we've learned about so far?

2. Describe a scenario where event-based concurrency could be used instead of threads.

3. Why might you prefer to use event-based concurrency instead of threads in some situations?

*Start by thinking of answers on your own. I will let you know when to start discussion.*

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# A Simple Networking Example

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# Discussion: Post Demo Reflection
**Questions for think, pair, share:**

1. How is event-based concurrency a form of *concurrency* if it doesn't involve computing in parallel?

2. In scenarios where you can use either threads or event-based concurrency, which do you prefer? Why?

*Start by thinking of answers on your own. I will let you know when to start discussion.*

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# Wrap Up

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# Reminders

## Lab
The Sudoku lab is due tonight.
Make sure you've arranged times to work with your group, and reserve times during office hours and/or attend mentor sessions this week if you need help.

## Assignment
Our first reading journal assignment is out now, and is due on Monday before class.

## Reading

- **Hints for System Design** (Butler W. Lampson)