[Haskell-cafe] Re: concurrent haskell: thread priorities

Neal Alexander wqeqweuqy at hotmail.com
Fri Jan 9 15:58:09 EST 2009

Simon Marlow wrote:
> Neal Alexander wrote:
>> Thomas DuBuisson wrote:
>>>     It seems like we could get some priority based scheduling (and still
>>>     be slackers) if we allow marked green threads to be strictly
>>>     associated with a specific OS thread (forkChildIO?).
>>> I think you want the GHC-only GHC.Conc.forkOnIO
>> GHC.Conc.forkOnIO is helpful but doest work in this case - it doesn't 
>> attach them to the same OS thread.
> But it does attach the thread to a particular "virtual CPU" in the GHC 
> RTS (we call them "capabilities"), with the intention that a virtual CPU 
> corresponds more or less to a real CPU core.
> Cheers,
>     Simon

Yea, but you still have the problem with FFI that uses TLS don't you? 
What about having a forkOnOS version with processor affinity? Or is 
there a way to "upgrade" a thread created with forkOnIO to Bound.

I have a thread with soft real-time requirements that cooperatively 
yields and uses thread local state. Right now there just doesn't seem to 
be any options.

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