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1. threadDelay :: Int -> IO ()

   base	Control.Concurrent

   Suspends the current thread for a given number of microseconds (GHC only). There is no guarantee that the thread will be rescheduled promptly when the delay has expired, but the thread will never continue to run earlier than specified. Be careful not to exceed maxBound :: Int, which on 32-bit machines is only 2147483647 μs, less than 36 minutes. Consider using Control.Concurrent.Thread.Delay.delay from unbounded-delays package.

2. threadWaitRead :: Fd -> IO ()

   base	Control.Concurrent

   Block the current thread until data is available to read on the given file descriptor (GHC only). This will throw an IOError if the file descriptor was closed while this thread was blocked. To safely close a file descriptor that has been used with threadWaitRead, use closeFdWith.

3. threadWaitReadSTM :: Fd -> IO (STM (), IO ())

   base	Control.Concurrent

   Returns an STM action that can be used to wait for data to read from a file descriptor. The second returned value is an IO action that can be used to deregister interest in the file descriptor.

4. threadWaitWrite :: Fd -> IO ()

   base	Control.Concurrent

   Block the current thread until data can be written to the given file descriptor (GHC only). This will throw an IOError if the file descriptor was closed while this thread was blocked. To safely close a file descriptor that has been used with threadWaitWrite, use closeFdWith.

5. threadWaitWriteSTM :: Fd -> IO (STM (), IO ())

   base	Control.Concurrent

   Returns an STM action that can be used to wait until data can be written to a file descriptor. The second returned value is an IO action that can be used to deregister interest in the file descriptor.

6. tryReadMVar :: MVar a -> IO (Maybe a)

   base	Control.Concurrent.MVar

   A non-blocking version of readMVar. The tryReadMVar function returns immediately, with Nothing if the MVar was empty, or Just a if the MVar was full with contents a.

7. ThreadKilled :: AsyncException

   base	Control.Exception

   This exception is raised by another thread calling killThread, or by the system if it needs to terminate the thread for some reason.

8. ThreadKilled :: AsyncException

   base	Control.Exception.Base

   This exception is raised by another thread calling killThread, or by the system if it needs to terminate the thread for some reason.

9. liftReadList :: Read1 f => (Int -> ReadS a) -> ReadS [a] -> ReadS [f a]

   base	Data.Functor.Classes

   readList function for an application of the type constructor based on readsPrec and readList functions for the argument type. The default implementation using standard list syntax is correct for most types.

10. liftReadList2 :: Read2 f => (Int -> ReadS a) -> ReadS [a] -> (Int -> ReadS b) -> ReadS [b] -> ReadS [f a b]

    base	Data.Functor.Classes

    readList function for an application of the type constructor based on readsPrec and readList functions for the argument types. The default implementation using standard list syntax is correct for most types.

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