[Haskell-cafe] Consecutive FFI calls

[David Turner]

Excellent, thanks!
On 3 Jun 2015 7:58 pm, "Edward Z. Yang" <ezyang at mit.edu> wrote:

> The ordering is guaranteed, because full synchronization is used
> when threads migrate.  (It goes something like, a capability with
> a full run queue grabs all idle capabilities, distributes its
> threads to those capabilities, and then releases them.  The act
> of acquiring and releasing a capability is a synchronization point.)
>
> Cheers,
> Edward
>
> Excerpts from David Turner's message of 2015-05-28 09:24:50 -0700:
> > Hi,
> >
> > If I make a sequence of FFI calls (on a single Haskell thread) but
> > which end up being called from different OS threads, is there any kind
> > of ordering guarantee given? More specifically, is there a full memory
> > barrier at the point where a Haskell thread migrates to a new OS
> > thread?
> >
> > Many thanks,
> >
> > David
>
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