[Haskell-cafe] Re: Hugsvs GHC (again)was: Re: Somerandomnewbiequestions

[Keean Schupke]

Simon Marlow wrote:

>On 19 January 2005 16:49, Keean Schupke wrote:
>
>  
>
>>But what about the continuing computation... we do not want
>>the fastest IO system, but we want the program to comlete the
>>fastest... So ideally we want 2 threads!
>>
>>One runs the Haskell code that is not waiting for IO. (IE other
>>Haskell threads)... The other runs a select loop as you suggest!
>>
>>This way the number of threads is fixed (2) and execution never
>>'blocks' for IO. (Simon, what about this scheme?)
>>    
>>
>
>This is what GHC does, if I understand you correctly.  The thread
>running select() does so in its own OS thread, while another OS thread
>runs the Haskell code.  As long as you use -threaded, that is.  Oh, and
>before GHC 6.4 it was done a different way - the scheduler used to do
>the select() between running Haskell threads.
>
>Cheers,
>	Simon
>  
>
So this means even though the IO calls block, the other Haskell threads
(when run with -threaded) keep running?

    Keean.