Hoogle Search

Within LTS Haskell 24.4 (ghc-9.10.2)

Note that Stackage only displays results for the latest LTS and Nightly snapshot. Learn more.

Exact lookup

1. module Data.Primitive.MutVar

   Primitive boxed mutable variables. This is a generalization of Data.IORef, Data.STRef and Data.STRef.Lazy to work in any PrimMonad.

2. data MutVar s a

   primitive	Data.Primitive.MutVar

   A MutVar behaves like a single-element mutable array associated with a primitive state token.

3. MutVar :: MutVar# s a -> MutVar s a

   primitive	Data.Primitive.MutVar

   No documentation available.

4. atomicModifyMutVar :: PrimMonad m => MutVar (PrimState m) a -> (a -> (a, b)) -> m b

   primitive	Data.Primitive.MutVar

   Atomically mutate the contents of a MutVar. This function is useful for using MutVar in a safe way in a multithreaded program. If you only have one MutVar, then using atomicModifyMutVar to access and modify it will prevent race conditions. Extending the atomicity to multiple MutVars is problematic, so if you need to do anything more complicated, using MVar instead is a good idea. atomicModifyMutVar does not apply the function strictly. This means if a program calls atomicModifyMutVar many times, but seldom uses the value, thunks will pile up in memory resulting in a space leak. To avoid this problem, use atomicModifyMutVar' instead.

5. atomicModifyMutVar' :: PrimMonad m => MutVar (PrimState m) a -> (a -> (a, b)) -> m b

   primitive	Data.Primitive.MutVar

   Strict version of atomicModifyMutVar. This forces both the value stored in the MutVar as well as the value returned.

6. modifyMutVar :: PrimMonad m => MutVar (PrimState m) a -> (a -> a) -> m ()

   primitive	Data.Primitive.MutVar

   Mutate the contents of a MutVar. modifyMutVar does not apply the function strictly. This means if a program calls modifyMutVar many times, but seldom uses the value, thunks will pile up in memory resulting in a space leak. To avoid this problem, use modifyMutVar' instead.

7. modifyMutVar' :: PrimMonad m => MutVar (PrimState m) a -> (a -> a) -> m ()

   primitive	Data.Primitive.MutVar

   Strict version of modifyMutVar.

8. mutVarFromIORef :: IORef a -> MutVar RealWorld a

   primitive	Data.Primitive.MutVar

   Convert MutVar to IORef

9. mutVarFromSTRef :: STRef s a -> MutVar s a

   primitive	Data.Primitive.MutVar

   Convert MutVar to STRef

10. mutVarToIORef :: MutVar RealWorld a -> IORef a

    primitive	Data.Primitive.MutVar

    Convert MutVar to IORef

Page 10 of many | Previous | Next