Custom Runtimes

[humasect]

The ability to build custom runtimes would be useful in many development situations. Like Objective Caml's -custom, one would be able to create a interactive-invokable (GHCi) with a custom main () initialization and finalizer. For things such as SDL applications, Cocoa applications, there is a need for custom run loops as well. This would be an immensely great integration feature for GHC. In these situations it is not possible to work in GHCi on most/all platforms without much work done in a specialized hs-plugins REPL environment.

Ideas of Requirements:

• specifiable initializer (from main)
• specifiable finalizer
• specifiable run loop / event handler (light thread) as such:
  • REPL
  • thread 0 - read, eval (send to thread 1), print, loop
  • thread 1 - processing events run loop, check for eval + send result to print stage

[the author is developing a Cocoa+GL native application in 100% Haskell sans HOC sans HOpenGL]

[humasect]

Update of formatting.

* specifiable initializer (from main) * specifiable finalizer * specifiable run loop / event handler (light thread) as such:

• REPL thread 0 - read, eval (send to thread 1), print, loop
• thread 1 - processing events run loop, check for eval + send result to print stage

[igloo]

I'm a bit unclear on what exactly is wanted here. Does GHC-as-a-library provide it?

[morabbin]

I don't the GHC API goes what the o.p. wants. He seems to be calling for replacing the scheduler (and other bits) with a domain-specific one of his own devising.

[simonmar]

Let's close - too vague, too old.