diff options
Diffstat (limited to 'Com/Simatime/Go.hs')
| -rw-r--r-- | Com/Simatime/Go.hs | 40 |
1 files changed, 23 insertions, 17 deletions
diff --git a/Com/Simatime/Go.hs b/Com/Simatime/Go.hs index 0eef38d..d9fb2d2 100644 --- a/Com/Simatime/Go.hs +++ b/Com/Simatime/Go.hs @@ -1,7 +1,8 @@ -{- | A Go-like EDSL to make working with concurrent in-process code a bit - easier to read. +{- | An EDSL to make working with concurrent in-process code a bit easier + to read. -This module is expected to be imported qualified as `Go`. +This module is expected to be imported qualified as `Go`. Inspired by +Golang and Clojure's core.async. $example -} @@ -15,6 +16,8 @@ module Com.Simatime.Go -- * Channels , Channel , chan + , broadcast + , tap , read , write ) @@ -23,21 +26,14 @@ where import Control.Concurrent ( forkIO , ThreadId ) -import Control.Concurrent.STM.TChan ( newTChan - , readTChan - , writeTChan - , TChan - ) +import qualified Control.Concurrent.STM.TChan as TChan import GHC.Conc ( STM , atomically ) -import Protolude ( IO() - , MonadIO(liftIO) - , flip - , (.) - ) +import Protolude ( IO ) + type Go = STM -type Channel = TChan +type Channel = TChan.TChan -- | Runs a Go command in IO. run :: Go a -> IO a @@ -49,15 +45,25 @@ fork = forkIO -- | Make a new channel. chan :: Go (Channel a) -chan = newTChan +chan = TChan.newTChan + +-- | Make a read-only channel. +broadcast :: Go (Channel a) +broadcast = TChan.newBroadcastTChan + +-- | Duplicates a channel, but then anything written to the source will +-- be available to both. This is like a combination of Clojure's +-- `core.async/mult` and `core.async/tap` but. +tap :: Channel a -> Go (Channel a) +tap = TChan.dupTChan -- | Take from a channel. Blocks until a value is received. read :: Channel a -> Go a -read = readTChan +read = TChan.readTChan -- | Write to a channel. write :: Channel a -> a -> Go () -write = writeTChan +write = TChan.writeTChan {- $example |