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