Polysemy.Conc.Effect.Lock

Lock effect, Internal

Documentation

data Lock :: Effect where

An exclusive lock or mutex, protecting a region from concurrent access.

Constructors

Lock :: m a -> Lock m a

Run an action if the lock is available, block otherwise.

LockOr :: m a -> m a -> Lock m a

Run the second action if the lock is available, or the first action otherwise.

Instances

type DefiningModule Lock

Defined in Polysemy.Conc.Effect.Lock

type DefiningModule Lock = "Polysemy.Conc.Effect.Lock"

lock :: forall r a. Member Lock r => Sem r a -> Sem r a

Run an action if the lock is available, block otherwise.

lockOr :: forall r a. Member Lock r => Sem r a -> Sem r a -> Sem r a

Run an action if the lock is available, block otherwise.

lockOrSkip :: forall r a. Member Lock r => Sem r a -> Sem r (Maybe a)

Run an action if the lock is available, skip and return Nothing otherwise.

lockOrSkip_ :: forall r a. Member Lock r => Sem r a -> Sem r ()

Run an action if the lock is available, skip otherwise. Return ().