STM is very simple to use, you create transactions in the STM monad (actions that should be executed as an atomic unit) then execute them with atomically :: STM a -> IO a. Under the hood the STM monad creates a dependency graph of the used STM primitives (TVars) in order to know when to undo/redo transactions. But from what I understand you'll pretty much only need to use (atomically . readTChan c)/(atomically . writeTChan c) which are in the IO monad

On 26 May 2014 11:01, Bulat Ziganshin <bulat.ziganshin@gmail.com> wrote:

Hello Haskell-cafe,

can you please point me to any OSS implementation of IO Channels with
priorities - i.e. data pushed to the Chan using high priority should
be read prior to the data pushed with lower priority:

pushChan ch 1 'x'
pushChan ch 2 'y'
readChan ch >>= print -- prints 'y'

i've found only STM implementations - i don't know STM enough, may be
i just need to convert STM to IO operations?

i don't expect strong guarantees, my algorithm will remain correct
anyway. and i don't have lot of objects, it's just a few dozens

--
Best regards,
Bulat mailto:Bulat.Ziganshin@gmail.com

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