Control.Concurrent.Conceit

Documentation

newtype Conceit e a

Conceit is very similar to Concurrently from the async package, but it has an explicit error type e.

The Applicative instance runs two actions concurrently, waits until they finish, and combines their results.

However, if any of the actions fails with e the other action is immediately cancelled and the whole computation fails with e.

To put it another way: Conceit behaves like Concurrently for successes and like race for errors.

Constructors

Conceit

Fields

runConceit :: IO (Either e a)

Instances

Bifunctor Conceit

Functor (Conceit e)

Applicative (Conceit e)

Alternative (Conceit e)

Apply (Conceit s)

<.> is concurrent.

Plus (Conceit e)

zero is a computation that never finishes.

Alt (Conceit e)

<!> makes its two arguments race against each other.

Monoid a => Monoid (Conceit e a)

Semigroup a => Semigroup (Conceit e a)

_Conceit :: IO a -> Conceit e a

Construct a Conceit as if it were a Concurrently.

_runConceit :: Conceit Void a -> IO a

Run a Conceit as if it were a Concurrently.

conceit :: IO (Either e a) -> IO (Either e b) -> IO (Either e (a, b))

mapConceit :: Traversable t => (a -> IO (Either e b)) -> t a -> IO (Either e (t b))

Works similarly to mapConcurrently from the async package, but if any of the computations fails with e, the others are immediately cancelled and the whole computation fails with e.

Internals

conceit' :: IO a -> IO b -> (MVar (Either SomeException (Either a b)) -> IO r) -> IO r

Verbatim copy of the internal concurrently' function from the async package.