Lua - Threading and Coroutines.

Lua module U114

Threading and Coroutines.

Exercises, examples and other material relating to training module U114. This topic is presented on public courses Learning to program in Lua, Lua Programming

Articles and tips on this subject		updated
3395	Parallel but not really parallel. Moving game characters. Coroutines in Lua. Virtual World game programming involves moving many characters - both player controlled and automatic - in parallel. The movements of each character depend - to a greater or lesser extent - on the prior movements of the character, and of the other charcaters and the resultant position and condition that ...	2011-08-18
2455	Lua examples - coroutines, error handling, objects, etc I have presented a bespoke Lua course over the last three days ... and it has lead me to some interesting new examples which I'm sharing here. Object Orientation is more a way of thinking and coding than a language feature in Lua - when you set up a piece of data / structure / object, you do so in a ...	2009-10-17
2314	Passing parameters to a coroutine in Lua Lua's coroutines, like Python's generators, provide for something which is akin to lightweight threading - rather than a strict functional calling stack, where one function must be completed before another is invoked, you can call a code block (function or method) and have it yield back to the calling ...	2009-08-01
1870	What to do with a huge crop of apples Last year, you had a good crop of apples on your tree .... what did you do with them? Make apple pies for all the neighbours! How? • You collect all the apples and bring them into the kitchen. • You prepare the apples ready for the pies. • You make the pastry and apple pies. • You ...	2008-11-04
1699	If you are learning Lua, here are some more examples During some courses, I write few (if any) new examples in front of my delegates, rather relying on the standard ones in the training notes (which I wrote anyway!) and making small changes and adjustments to illustrate how things work. On other courses, though, I write a some new examples from scratch ...	2008-08-05
1691	Co-routines in Lua - co-operative processing CoRoutines in Lua allow you to have a number of pieces of co-operative code which (whilst they’re not running in parallel in a true multithreaded way) allow you to progress through multiple strands of your code at the sametime. Let’s take an example. I have a rather large text file that lists ...	2008-06-29

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Examples from our training material

charmoves	coroutine for game player movements
coro	simple coroutine example
cosy	Illustration of Coroutines
crcr	coroutine basics
datafeeder	using a coroutine as a generator
ff2.lua	Multiple coroutines in parallel use
inco	Passing parameters to coroutines
nocoro	NOT using coroutines - filling a table then using it instead

Background information

Some modules are available for download as a sample of our material or under an Open Training Notes License for free download from http://www.training-notes.co.uk.

Topics covered in this module

Coroutines as co-operative programs.
Transferring control and maintaining state.
Concurrent tasks, and keeping them apart.
Event handling - event loops and yielding

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