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Message Passing, Concurrency, And Parallelism with Erlang

This presentation by Craig R. Kuehn explores the concepts of message passing, concurrency, and parallelism in Erlang. It covers the basics of variables, data types, modules, functions, conditions/controls, and more. It also delves into advanced topics such as process handling, message passing tools, handling errors, and the future of concurrency-oriented programming. Presented by the University of Wisconsin-Platteville CS Department.

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Message Passing, Concurrency, And Parallelism with Erlang

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  1. Message Passing, Concurrency, And Parallelism with Erlang Presented By: Craig R. Kuehn Department of Computer Science and Software Engineering University of Wisconsin-Platteville kuehnc@uwplatt.edu

  2. R&D @ Ellemtel CS Lab History • 1985 – Tried 20 Different Languages • 1987 – First Experiments with Erlang • 1991 – First Project in Erlang • 1993 – BOS • 1996 – OTP! • 1999 – OPEN SOURCE!!! • 2003 – Workshop Joins ACM SIGPLAN ICPF • 2006 – SMP Capable

  3. Ready! • Most Important Rule: • Programming Is Fun!! • AI class? • Functional Programming? • Concurrency-Oriented Programming?

  4. GO!!! Set!

  5. We Have to Start Somewhere The Basics… Variables • Start With a Capital Letter • Single Assignment – Not Like C++ or Java (I told you to forget about them) • “=“ -> Lhs = Rhs • Bound v.s. Unbound • “_” the anonymous variable • Why Single Assignment? • Scope

  6. …The Basics Continued… Data Types • Integers • Floats • Atoms • Tuples • Records • Lists • Strings • Binaries

  7. …The Basics Continued Still… Modules • Basic Unit • moduleName.erl • Compiled • moduleName.beam • Module • Import • Export

  8. …The Basics Continued Still More… Functions • Clauses • Head -> Body • “Tried” In Order • Arity • fun Anonymous Function • Higher-Order Functions • List Comprehensions • BIFs

  9. …The Basics Continued And Still More… Conditions/Controls • Not really needed • Guards (semicolon and comma delimited) • Case • If • Exceptions

  10. A Tidbit About Erlang Intermission From The Heavy Stuff Targets or Goals In Mind During The Design • Fault Tolerant • Continuous • Concurrent • Distributed, Heterogeneous • Highly Reliable, “Soft”Real-time • Scalable • Tail Recursive • Process-Oriented

  11. The Advanced Part… Marching Onward Process Stuff • Process Dictionary • Pure Message Passing Language • Detriment To Your Health • Bad Horror Movies • Relax

  12. …The Advanced Part Continued… Message Passing, Concurrency, and Parallelism Tools • Spawn() • “!” The Send Operator • Receive…end (Blocking and Non-Blocking)

  13. …The Advanced Part Continued Still… The Intricate Parts of Receive • Timer • First Message • Not A Match • No More Messages • It Is A Match!!! • Timer Elapses

  14. …The Advanced Part Continued Still More… Message Passing, Concurrency, and Parallelism Specs • Publishing a Process Identifier • Spawning with MFA • “Hot Swapping”

  15. …The Advanced Part Continued And Still More… Message Passing, Concurrency, and Parallelism Errors • Exit Signals • Linking • Monitors

  16. Gosh, Finally! The Future: • Concurrency-Oriented Programming • Erlang • UW-Platteville CS Department

  17. So You Think You Have A Question, Do You? Well Do You?

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