Created
May 14, 2009 04:29
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{-# LANGUAGE MultiParamTypeClasses, ScopedTypeVariables, TypeSynonymInstances, FlexibleInstances #-} | |
module PingPong where | |
-- standard ping-pong actor example | |
import IO | |
import Monad | |
import Data.IORef | |
import Control.Concurrent | |
import Actor.ActorBase | |
import Actor.ActorSyntax | |
import Actor.ActorCompiler | |
import Actor.ActorLinearSearch | |
-- boilerplate | |
data Msg | |
= Ping | Pong | Stop deriving (Eq,Show) | |
valHashOp_Msg = HashOp {numberOfTables = 3, | |
hashMsg = \ msg -> case msg of | |
Ping -> 1 | |
Pong -> 2 | |
Stop -> 3 } | |
instance EMatch Msg where | |
match tags m1 m2 = return (m1 == m2, tags) | |
-- auxilliary | |
loop c = do { c; loop c} | |
--wait = 2 | |
wait = 10000 | |
pingAct count pong self = | |
do { pingsLeft <- newIORef (count -1) | |
; let pong_pid = actorToPID pong | |
; send pong_pid Ping | |
; loop | |
( receive self | |
[ [Pong] .->. ( do { v <- readIORef pingsLeft | |
; Monad.when (v `mod` wait == 0) (putStrLn "ping:Pong") | |
; if v > 0 | |
then do {send pong_pid Ping; writeIORef pingsLeft (v-1) } | |
else do {putStrLn "ping:Stop" ; send pong_pid Stop } | |
} | |
) | |
] | |
) | |
} | |
pongAct pong exit self = | |
do { pongCount <- newIORef 0 | |
; let pong_pid = actorToPID pong | |
; loop | |
( receive self | |
[ [Ping] .->. ( do { v <- readIORef pongCount | |
; Monad.when (v `mod` wait == 0) (putStrLn ("pong:Ping " ++ show v)) | |
; send pong_pid Pong | |
; writeIORef pongCount (v+1) | |
} | |
) | |
, | |
[Stop] .->. ( do { putStrLn "pong: Stop" | |
; putMVar exit () -- EXIT | |
} | |
) | |
] | |
) | |
} | |
main :: IO () | |
main = do { (ping :: Act Msg) <- createActor valHashOp_Msg | |
; (pong :: Act Msg) <- createActor valHashOp_Msg | |
; exit <- newEmptyMVar | |
; runActor ping (pingAct 1000000 pong) | |
; runActor pong (pongAct ping exit) | |
; readMVar exit -- blocks till we hit exit | |
; kill (actorToPID ping) ; kill (actorToPID pong) | |
} |
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