No atomic read on MVar?

David Menendez dave at
Mon Nov 3 17:51:33 EST 2008

On Mon, Nov 3, 2008 at 6:29 AM, Philip K.F. Hölzenspies
<p.k.f.holzenspies at> wrote:
> I have now implemented my variable as a pair of MVars, one of which serves as
> a lock on the other. Both for performance reasons and for deadlock analysis,
> I would really like an atomic read on MVars, though. Does it exist? If not,
> why not?

Have you considered using STM? All the operations on TMVars are atomic.

Dave Menendez <dave at>

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