On Tue, Jul 31, 2012 at 7:37 AM, Bertram Felgenhauer < [email protected]> wrote:
> Note that MVar# itself cannot be unpacked -- the StgMVar record will > always be a separate heap object. One could imagine a couple of techniques to unpack the MVar# itself, and was curious if GHC might employ one of them. So, really, unpacking the MVar does not eliminate a layer of indirection, it just eliminates the need to check a pointer tag (and possibly execute a thunk or follow some redirects if you don't have a pointer to an MVar#). I think this is what I was ultimately after. Best, Leon
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