How can I handle errors in asynchronous Haskell code?

How can I handle errors in asynchronous Haskell code?

In Haskell, you can use the async library to manage asynchronous computations. To handle errors, you can use try or catch from the Control.Exception module.

Can you show me an example of using try with async?

Sure! Here's a simple example:

import Control.Concurrent.Async
import Control.Exception

main :: IO ()
main = do
    result <- try (async (someAsyncFunction)) :: IO (Either SomeException ResultType)
    case result of
        Left ex  -> putStrLn $ "Caught an exception: " ++ show ex
        Right val -> putStrLn $ "Result: " ++ show val

What if I want to handle multiple async tasks?

You can use waitAny or waitEither to handle multiple tasks. They allow you to wait for the first completed task and handle its result or error accordingly.

Is there a way to set a timeout for async tasks?

Yes, you can use timeout from Control.Concurrent to specify a time limit for your async tasks. If the task doesn't complete in time, it will return Nothing.