functions blocks only the thread making the call.
-}
--- Thread Ids, specifically the instances of Eq and Ord for these things.
--- The ThreadId type itself is defined in std/PrelConc.lhs.
-
--- Rather than define a new primitve, we use a little helper function
--- cmp_thread in the RTS.
-
-#ifdef __GLASGOW_HASKELL__
-id2TSO :: ThreadId -> ThreadId#
-id2TSO (ThreadId t) = t
-
-foreign import ccall unsafe "cmp_thread" cmp_thread :: ThreadId# -> ThreadId# -> CInt
--- Returns -1, 0, 1
-
-cmpThread :: ThreadId -> ThreadId -> Ordering
-cmpThread t1 t2 =
- case cmp_thread (id2TSO t1) (id2TSO t2) of
- -1 -> LT
- 0 -> EQ
- _ -> GT -- must be 1
-
-instance Eq ThreadId where
- t1 == t2 =
- case t1 `cmpThread` t2 of
- EQ -> True
- _ -> False
-
-instance Ord ThreadId where
- compare = cmpThread
-
-foreign import ccall unsafe "rts_getThreadId" getThreadId :: ThreadId# -> Int
-
-instance Show ThreadId where
- showsPrec d t =
- showString "ThreadId " .
- showsPrec d (getThreadId (id2TSO t))
-
-#endif /* __GLASGOW_HASKELL__ */
-
#ifndef __HUGS__
max_buff_size :: Int
max_buff_size = 1
import GHC.Pack ( packCString# )
import GHC.Ptr ( Ptr(..), plusPtr, FunPtr(..) )
import GHC.STRef
+import GHC.Show ( Show(..), showString )
import Data.Typeable
infixr 0 `par`, `pseq`
it defines 'ThreadId' as a synonym for ().
-}
+instance Show ThreadId where
+ showsPrec d t =
+ showString "ThreadId " .
+ showsPrec d (getThreadId (id2TSO t))
+
+foreign import ccall unsafe "rts_getThreadId" getThreadId :: ThreadId# -> Int
+
+id2TSO :: ThreadId -> ThreadId#
+id2TSO (ThreadId t) = t
+
+foreign import ccall unsafe "cmp_thread" cmp_thread :: ThreadId# -> ThreadId# -> CInt
+-- Returns -1, 0, 1
+
+cmpThread :: ThreadId -> ThreadId -> Ordering
+cmpThread t1 t2 =
+ case cmp_thread (id2TSO t1) (id2TSO t2) of
+ -1 -> LT
+ 0 -> EQ
+ _ -> GT -- must be 1
+
+instance Eq ThreadId where
+ t1 == t2 =
+ case t1 `cmpThread` t2 of
+ EQ -> True
+ _ -> False
+
+instance Ord ThreadId where
+ compare = cmpThread
+
{- |
This sparks off a new thread to run the 'IO' computation passed as the
first argument, and returns the 'ThreadId' of the newly created