concur-sdl doesn't work

[potocpav]

I want to experiment with native back-ends for Concur, and I wanted to use the simple concur-sdl as a basis for my experiments. However, after stack build and stack run, it crashes with this rather unhelpful message:

concur-sdl-example: thread blocked indefinitely in an STM transaction

Could you point me to what might be wrong?

PS: Thanks for this library. I used the Purescript variant for a internal web page with great success - that's why I'm now looking to use concur in native tools too (it could be great as an alternative to ImGui).

[ajnsit]

@potocpav I haven't worked with this code in a while, and I expect it's bitrotten. I'll look at this and get back to you.

I'm glad you had a good experience with Purescript-Concur. I would be happy to help answer questions or help you figure out how to implement some of your usecases with the lib.

[potocpav]

I don't have a specific question right now. I figured that understanding concur-core well enough to fix this issue may take me a long time, while it may be a trivial fix for you. If it's not, or you don't want to spend time with it, I will just try to power through.

Alternatively, concur-brick may also be a nice starting point, but it doesn't work either:

Variable not in scope:
          runIO
            :: SuspendF [Image] (Free (Suspend [Image]) b) -> Maybe (IO ())

[ajnsit]

Concur-brick was never finished, it’s more of a placeholder. For Concur-sdl it’s not a trivial fix, but I will take care of it sometime this week, since it’s such a small codebase and it would be nice to have a desktop example for concur.