Céu: Structured Synchronous Reactive Programming

by flippyhead • 11 years ago

66 23 11 years ago

rwmj• 11 years ago

I have flashbacks to Occam.

pron3• 11 years ago

The language is a less-restricted (and less verifiable) Esterel descnedant. Esterel and its derivatives have been used successfully by the industry, for many years, to write fully verifiable, safety-critical, real-time reactive systems.

[1] https://en.wikipedia.org/wiki/Esterel

ufo3• 11 years ago

What kind of restrictions are you thinking about here? I don't know Esterel very well but Céu is very restrictive in order to ensure that responses to events don't loop. There are no recursive functions, no dynamic allocation, etc.

pron3• 11 years ago

Esterel is not Turing complete, and it doesn't allow dynamic allocation.

ufo3• 11 years ago

One of the neat features of Céu is that it has Simula-like objects with coroutines. Method calls are asynchronous, can be paused while they wait for events and many objects can be simulated run concurrently. One of the students here in the lab is experimenting with using Céu to code the logic for some simple 2D games and according to him the event system allows you to write code in a very "natural" way.

Another special feature of Céu is "strong abortion" with the par/or primitive. par/or lets you run two computations concurrently and if one of them completes the other one is aborted and all its resources are freed. Aborting asynchronous computations is not something that all asynchronous programming systems let you do very well.

(btw, if anyone is wondering, Céu means sky in Portuguese)

cschep• 11 years ago

Naming things is hard, but this seems like a total punt. :) Help us out!

flippyhead• 11 years ago

I discovered this while struggling with C++ for an Arduino project. I'm really digging Ceu as an alternative that runs directly (and efficiently!) on the Arduino.

biot• 11 years ago

I can't be the only person wondering: how do you pronounce it? Kay-you/Say-you? Kyuh/Syuh?

andlima• 11 years ago

Assuming it's céu as in the Portuguese word for sky, it's pronounced as /sɛw/ (in Brazilian Portuguese, at least). It sounds similar to "sell", only ending in /w/ rather than /l/.

http://pt.tfd.com/c%C3%A9u

personlurking• 11 years ago

The recording in the dictionary link is a bit harsh/off. Here are some native Portuguese speakers saying it

http://www.forvo.com/word/c%C3%A9u/

c4n4rd• 11 years ago

Ceu (Portuguese) means Sky in English.

I think it is a take on Lua (the scripting language) which means moon.

The pronunciation is like 'Seoul' (South Korean Capital), with the 'e' pronuonced slightly more open as in egg.

kyllo3• 11 years ago

Which pronunciation of Seoul is it like? The way Koreans pronounce it? The way Americans pronounce it? The way Europeans pronounce it?

I'm confused because Seoul doesn't have an 'e' sound in it at all, in Korean.

findjashua• 11 years ago

I thought Seoul was pronounced as 'soul'

agumonkey2• 11 years ago

A tiny reboot of Oracle:Sun VS IBM:Eclipse.

tormeh• 11 years ago

Discovered this right after handing in my master thesis where I wrote an (extremely) prototype compiler for my own language which has a similar approach.

Synchronous seems to be the way to go for multithreaded programs where optimal performance is not required.

digsmahler• 11 years ago

My favorite singer is Céu. https://en.wikipedia.org/wiki/C%C3%A9u

Céu: Structured Synchronous Reactive Programming

Related Stories