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1. readChan :: MonadConc m => Chan m a -> m a

   concurrency	Control.Concurrent.Classy.Chan

   Read the next value from the Chan.

2. readIORef :: MonadConc m => IORef m a -> m a

   concurrency	Control.Concurrent.Classy.IORef

   Read the current value stored in a reference.

   readIORef ioref = readForCAS ioref >>= peekTicket
   

3. readMVar :: MonadConc m => MVar m a -> m a

   concurrency	Control.Concurrent.Classy.MVar

   Block until a value is present in the MVar, and then return it. This does not "remove" the value, multiple reads are possible.

4. readTBQueue :: MonadSTM stm => TBQueue stm a -> stm a

   concurrency	Control.Concurrent.Classy.STM.TBQueue

   Read the next value from the TBQueue.

5. readTChan :: MonadSTM stm => TChan stm a -> stm a

   concurrency	Control.Concurrent.Classy.STM.TChan

   Read the next value from the TChan.

6. readTMVar :: MonadSTM stm => TMVar stm a -> stm a

   concurrency	Control.Concurrent.Classy.STM.TMVar

   Read from a TMVar without emptying, or retry if it is empty.

7. readTQueue :: MonadSTM stm => TQueue stm a -> stm a

   concurrency	Control.Concurrent.Classy.STM.TQueue

   Read the next value from the TQueue.

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

   concurrency	Control.Concurrent.Classy.STM.TVar

   Return the current value stored in a TVar.

9. 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
   

10. readForCAS :: MonadConc m => IORef m a -> m (Ticket m a)

    concurrency	Control.Monad.Conc.Class

    Read the current value stored in a reference, returning a Ticket, for use in future compare-and-swap operations.

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