Re: [Haskell-cafe] Simplest way to move a ... `using` ... line into the IO monad?

On Fri, Oct 27, 2023 at 11:36:53AM -0700, David Banas wrote:

What is the simplest way to translate a non-monadic line of Haskell code, such as:

res = map foo xs `using` parList rseq

For use in the IO monad?

This doesn’t work:

res <- mapM fooM xs `using` parTraversable rseq

The docs for Control.Parallel.Strategies say "The parallel tasks evaluated by a Strategy may have no side effects. For non-deterministic parallel programming, see Control.Concurrent."[1]. So I guess you should look into Control.Concurrent[2]. Tom [1] https://www.stackage.org/haddock/lts-21.17/parallel-3.2.2.0/Control-Parallel... [2] https://www.stackage.org/haddock/lts-21.17/base-4.17.2.0/Control-Concurrent....