[Haskell-cafe] Re: Parallel executing of actions

Mitar wrote:

Hi!

On 4/16/07, Bertram Felgenhauer wrote:

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Since all the threads block on a single MVar how do they run in parallel?

The idea is that before the threads block on the MVar, they run their action x to completion.

The rendering crashes. I will have to precompute the values in threads someway and then sequentially draw it? Any suggestion how to do that?

I'm guessing this is becuase of the thread-local state used by OpenGL, which is the reason we have forkOS. All your OpenGL calls must be executed by the same Haskell thread, and it must be a bound thread (i.e. either the main thread, or a thread created with forkOS). Cheers, Simon