[Haskell-cafe] Concurrency best practices?

Sebastian Fischer fischer at nii.ac.jp
Sat Feb 5 11:42:45 CET 2011

Hi Wren,

maybe Twilight STM is for you:


On Sat, Feb 5, 2011 at 6:46 PM, wren ng thornton <wren at freegeek.org> wrote:

> So I'm working on a project that uses STM to run a lot of things in
> parallel without the headaches of locks. So far it's working beautifully,
> STM rocks. But there's one snag...
> Sometimes I need those threads to do some IO like printing logging info.
> I'd like to make these IO chunks atomic with respect to one another so that
> the logging output isn't garbage. Since I'm using STM everywhere else, I'd
> love to use it for this too (instead of mixing STM and non-STM concurrency)
> except you can't embed IO in STM.
> I could just use STM vars as locks to force the atomicity, but locks are
> ugly and bug-prone. So what's the current best practice for doing this kind
> of thing?
> --
> Live well,
> ~wren
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