[project @ 2005-02-01 00:52:20 by ross]

[ghc-base.git] / GHC / IOBase.lhs

diff --git a/GHC/IOBase.lhs b/GHC/IOBase.lhs
index 8700128..233148b 100644 (file)
--- a/GHC/IOBase.lhs
+++ b/GHC/IOBase.lhs
@@ -1,5 +1,5 @@
 \begin{code}
-{-# OPTIONS -fno-implicit-prelude #-}
+{-# OPTIONS_GHC -fno-implicit-prelude #-}
 -----------------------------------------------------------------------------
 -- |
 -- Module      :  GHC.IOBase
@@ -568,6 +568,10 @@ data Exception
        -- ^The current thread was executing a call to
        -- 'Control.Concurrent.MVar.takeMVar' that could never return,
        -- because there are no other references to this 'MVar'.
+  | BlockedIndefinitely
+       -- ^The current thread was waiting to retry an atomic memory transaction
+       -- that could never become possible to complete because there are no other
+       -- threads referring to any of teh TVars involved.
   | Deadlock
        -- ^There are no runnable threads, so the program is
        -- deadlocked.  The 'Deadlock' exception is
@@ -705,6 +709,7 @@ instance Show Exception where
   showsPrec _ (DynException _err)        = showString "unknown exception"
   showsPrec _ (AsyncException e)        = shows e
   showsPrec _ (BlockedOnDeadMVar)       = showString "thread blocked indefinitely"
+  showsPrec _ (BlockedIndefinitely)     = showString "thread blocked indefinitely"
   showsPrec _ (NonTermination)           = showString "<<loop>>"
   showsPrec _ (Deadlock)                 = showString "<<deadlock>>"