| Safe Haskell | None |
|---|---|
| Language | Haskell98 |
Control.Distributed.Process.Internal.WeakTQueue
Description
Clone of Control.Concurrent.STM.TQueue with support for mkWeakTQueue
Not all functionality from the original module is available: unGetTQueue, peekTQueue and tryPeekTQueue are missing. In order to implement these we'd need to be able to touch# the write end of the queue inside unGetTQueue, but that means we need a version of touch# that works within the STM monad.
- data TQueue a
- newTQueue :: STM (TQueue a)
- newTQueueIO :: IO (TQueue a)
- readTQueue :: TQueue a -> STM a
- tryReadTQueue :: TQueue a -> STM (Maybe a)
- writeTQueue :: TQueue a -> a -> STM ()
- isEmptyTQueue :: TQueue a -> STM Bool
- mkWeakTQueue :: TQueue a -> IO () -> IO (Weak (TQueue a))
Original functionality
TQueue is an abstract type representing an unbounded FIFO channel.
newTQueueIO :: IO (TQueue a) Source #
IO version of newTQueue. This is useful for creating top-level
TQueues using unsafePerformIO, because using
atomically inside unsafePerformIO isn't
possible.
tryReadTQueue :: TQueue a -> STM (Maybe a) Source #
A version of readTQueue which does not retry. Instead it
returns Nothing if no value is available.