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copied!<p>I've found a beautiful <a href="http://hackage.haskell.org/package/monad-parallel" rel="nofollow">"monad-parallel"</a> library intended for very similar purposes, and an even more powerful fork of it - <a href="http://hackage.haskell.org/package/classy-parallel" rel="nofollow">"classy-parallel"</a>.</p> <p>For a monad to be usable in a parallelizable manner it needs to have an instance of a <a href="http://hackage.haskell.org/packages/archive/classy-parallel/0.1.0.0/doc/html/Control-Monad-Parallel.html#t%3aParallel" rel="nofollow"><code>Parallel</code></a> typeclass. And the "classy-parallel" library already provides instances for the most important types for such purposes: <code>ResourceT IO</code> and <code>ReaderT</code>.</p> <p>Assuming the presence of appropriate instances the code in question can be transformed to following:</p> <pre><code>import qualified Control.Monad.Parallel as Parallel main = runConnection connectionSettings $ Parallel.sequence [action1, action2, action3] </code></pre> <p>For simply forking in <code>ResourceT</code> the <a href="http://hackage.haskell.org/packages/archive/resourcet/0.3.0/doc/html/Control-Monad-Trans-Resource.html#v%3aresourceForkIO" rel="nofollow"><code>resourceForkIO</code></a> can be useful. There's also a <a href="http://hackage.haskell.org/package/monad-fork-0.1" rel="nofollow">"monad-fork"</a> library which provides a neat and simple generalization over forking on top of <code>forkIO</code> and <code>resourceForkIO</code>.</p>

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