Basic concurrency stuff
\begin{code}
-{-# OPTIONS -fno-implicit-prelude #-}
+{-# OPTIONS -fcompiling-prelude -fno-implicit-prelude #-}
module PrelConc
( ThreadId(..)
, seq -- :: a -> b -> b
, yield -- :: IO ()
- {-threadDelay, threadWaitRead, threadWaitWrite,-}
+ -- Waiting
+ , threadDelay -- :: Int -> IO ()
+ , threadWaitRead -- :: Int -> IO ()
+ , threadWaitWrite -- :: Int -> IO ()
-- MVars
, MVar -- abstract
import PrelBase ( Int(..) )
import PrelException ( Exception(..), AsyncException(..) )
-infixr 0 `par`
+infixr 0 `par`, `seq`
\end{code}
%************************************************************************
-- But since ThreadId# is unlifted, the Weak type must use open
-- type variables.
---forkIO has now been hoisted out into the concurrent library.
+--forkIO has now been hoisted out into the Concurrent library.
killThread :: ThreadId -> IO ()
killThread (ThreadId id) = IO $ \ s ->
seq :: a -> b -> b
seq x y = case (seq# x) of { 0# -> seqError; _ -> y }
-par :: a -> b -> b
-
{-# INLINE par #-}
-#if defined(__PARALLEL_HASKELL__) || defined (__GRANSIM__)
+par :: a -> b -> b
par x y = case (par# x) of { 0# -> parError; _ -> y }
-#else
-par _ y = y
-#endif
-
\end{code}
%************************************************************************
\begin{code}
--Defined in IOBase to avoid cycle: data MVar a = MVar (SynchVar# RealWorld a)
-instance Eq (MVar a) where
- (MVar mvar1#) == (MVar mvar2#) = sameMVar# mvar1# mvar2#
-
newEmptyMVar :: IO (MVar a)
newEmptyMVar = IO $ \ s# ->
@threadWaitWrite@ is similar, but for writing on a file descriptor.
\begin{code}
-{- Not yet -- SDM
threadDelay, threadWaitRead, threadWaitWrite :: Int -> IO ()
-threadDelay (I# x#) = IO $ \ s# ->
- case delay# x# s# of
- s2# -> (# s2#, () #)
-
-threadWaitRead (I# x#) = IO $ \ s# ->
- case waitRead# x# s# of
- s2# -> (# s2#, () #)
-
-threadWaitWrite (I# x#) = IO $ \ s# ->
- case waitWrite# x# s# of
- s2# -> (# s2#, () #)
--}
+threadDelay (I# ms) = IO $ \s -> case delay# ms s of s -> (# s, () #)
+threadWaitRead (I# fd) = IO $ \s -> case waitRead# fd s of s -> (# s, () #)
+threadWaitWrite (I# fd) = IO $ \s -> case waitWrite# fd s of s -> (# s, () #)
\end{code}