[Haskell-cafe] concurrency vs. I/O in GHC

Gregory Crosswhite gcross at phys.washington.edu
Sat Oct 23 12:42:56 EDT 2010

On 10/23/10 7:54 AM, John Lato wrote:
> On Fri, Oct 22, 2010 at 6:16 PM, Bulat Ziganshin 
> <bulat.ziganshin at gmail.com <mailto:bulat.ziganshin at gmail.com>> wrote:
>     Hello John,
>     Monday, October 18, 2010, 8:15:42 PM, you wrote:
>     > If anyone is listening, I would very much like for there to be a
>     > mechanism by which external functions can be called "unsafe"-ly, but
>     > without blocking all other Haskell threads.  I have code that
>     does this:
>     +RTS -N2
> This doesn't work, which was why the OP asked in the first place.  
> When a thread calls an unsafe foreign function, it blocks everything 
> until that function returns.

Is that true?  The last time we discussed this in Haskell Cafe the 
conclusion I drew from the discussion was that unsafe foreign functions 
block the current thread but not any other thread.

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