[Haskell-cafe] Concurrency best practices?

aditya siram aditya.siram at gmail.com
Sat Feb 5 16:41:33 CET 2011

There's the stm-io-hooks [1] package but it looks like it hasn't been
updated in a while.

On Sat, Feb 5, 2011 at 3:46 AM, 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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