CSC364 Lecture 06

Introduction to Networked, Distributed, and Parallel Computing
Threads
(202601)

Transcript

1. Dr. Javier Gonzalez-Sanchez javiergs@calpoly.edu www.javiergs.info o ffi ce: 14 -227 CSC 364 Introduction to Networked, Distributed, and Parallel Computing Lecture 06. Threads 1
2. 2 De f initions
3. 3 De f inition Process • Own memory sp a ce • Isol a ted from others Thre a d • Lives inside a process • Sh a res memory with other thre a ds • Lightweight a nd f a st to cre a te J a v a progr a ms => one process, often m a ny thre a ds
4. 4 Why Threads? - To keep progr a ms responsive - To h a ndle multiple clients (servers!) - To a void blocking everything while w a iting Ex a mples: - Web server h a ndling m a ny browsers - GUI th a t st a ys responsive while doing work - G a me loop + input + rendering
5. Threads Blackboard Example
6. Blackboard 6
8. Implementation :: Classroom 8
9. Implementation :: Professor 9
10. Implementation :: Student 10
11. 11 Implementation :: Blackboard
12. Reference 12 Reading https://medium.com/javarevisited/design-patterns-101-hello-singleton-2d3f227c7729
13. Reference 13 Reading https://medium.com/swlh/software-design-patterns-why-what-and-an-example-8d4c0934a6ca
14. Questions 14
15. Lab 06. Threads
16. 16 Lab • Implement a sh a red Bl a ckbo a rd (Singleton) th a t stores a St a ck<Integer> • Cre a te a Person cl a ss (Runn a ble) th a t continuously pushes numbers • Cre a te a C a t cl a ss (Runn a ble) th a t continuously pops numbers • St a rt a ll thre a ds from m a in • m a in periodic a lly prints the Bl a ckbo a rd contents Rules • Use a regul a r St a ck (no concurrent or blocking structures) • No synchroniz a tion a t f irst (this is intention a l) • Expect incorrect or inconsistent beh a vior
17. 17 Observe & Document • Run 10 object c a ts a nd 1 object person • Run 10 object person a nd 1 object c a ts • Wh a t h a ppens when C a ts pop from a n empty st a ck? • Does output ch a nge between runs? Why?
18. CSC 364 Introduction to Introduction to Networked, Distributed, and Parallel Computing Javier Gonzalez-Sanchez, Ph.D. javiergs@calpoly.edu Winter 2026 Copyright. These slides can only be used as study material for the class CSC 364 at Cal Poly. They cannot be distributed or used for another purpose. 18