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Within LTS Haskell 24.18 (ghc-9.10.3)

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  1. modifyTVar' :: MonadSTM stm => TVar stm a -> (a -> a) -> stm ()

    concurrency Control.Concurrent.Classy.STM.TVar

    Mutate the contents of a TVar strictly.

  2. newTVar :: MonadSTM stm => a -> stm (TVar stm a)

    concurrency Control.Concurrent.Classy.STM.TVar

    Create a new TVar containing the given value. 

    newTVar = newTVarN ""

  3. newTVarN :: MonadSTM stm => String -> a -> stm (TVar stm a)

    concurrency Control.Concurrent.Classy.STM.TVar

    Create a new TVar containing the given value, but it is given a name which may be used to present more useful debugging information. If an empty name is given, a counter starting from 0 is used. If names conflict, successive TVars with the same name are given a numeric suffix, counting up from 1. 

    newTVarN _ = newTVar

  4. readTVar :: MonadSTM stm => TVar stm a -> stm a

    concurrency Control.Concurrent.Classy.STM.TVar

    Return the current value stored in a TVar.

  5. readTVarConc :: MonadConc m => TVar (STM m) a -> m a

    concurrency Control.Concurrent.Classy.STM.TVar

    Read the current value stored in a TVar. This may be implemented differently for speed. 

    readTVarConc = atomically . readTVar

  6. stateTVar :: MonadSTM stm => TVar stm s -> (s -> (a, s)) -> stm a

    concurrency Control.Concurrent.Classy.STM.TVar

    Like modifyTVar' but the function is a simple state transition that can return a side value which is passed on as the result of the STM.

  7. swapTVar :: MonadSTM stm => TVar stm a -> a -> stm a

    concurrency Control.Concurrent.Classy.STM.TVar

    Swap the contents of a TVar, returning the old value.

  8. writeTVar :: MonadSTM stm => TVar stm a -> a -> stm ()

    concurrency Control.Concurrent.Classy.STM.TVar

    Write the supplied value into the TVar.

  9. newTVarConc :: MonadConc m => a -> m (TVar (STM m) a)

    concurrency Control.Monad.Conc.Class

    Create a TVar. This may be implemented differently for speed. 

    newTVarConc = atomically . newTVar

  10. readTVarConc :: MonadConc m => TVar (STM m) a -> m a

    concurrency Control.Monad.Conc.Class

    Read the current value stored in a TVar. This may be implemented differently for speed. 

    readTVarConc = atomically . readTVar

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