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Copy forks properly with over-tailed environment

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This commit is contained in:
Andrzej Rybczak 2022-03-07 04:42:28 +01:00
parent 13153cc12f
commit 9034e8f572
1 changed files with 11 additions and 5 deletions
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10
effectful-core/src/Effectful/Internal/Env.hs
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@ -284,13 +284,19 @@ copyForks es fs size = \case
Forks _ baseIx lref0 forks -> do
EnvRef _ es0 fs0 <- readIORef lref0
let n = size - baseIx
-- It might happen that the environment was over-tailed and the size is now
-- less than the baseIx of the fork. In such case we simply try our luck
-- with the older fork.
if n <= 0
then copyForks es fs size forks
else do
copySmallMutableArray es baseIx es0 0 n
copySmallMutableArray fs baseIx fs0 0 n
copyForks es fs baseIx forks
type EnvRefStore = IORef (IM.IntMap (IORef EnvRef))
-- | Relink local environments hiding in the handler.
-- | Relink local environments hiding in the handlers.
relinkData
:: (forall es. Env es -> IO (Env es))
-> SmallMutableArray RealWorld Any
@ -307,7 +313,7 @@ relinkData relink es fs = \case
>>= writeSmallArray es i . toAny
relinkData relink es fs i
-- | Relink local environments hiding in the handler.
-- | Relink local environments hiding in the handlers.
relinkEnv :: IORef EnvRef -> ForkIdGen -> EnvRefStore -> Env es -> IO (Env es)
relinkEnv gref gen store (Env forks size _ _) = Env
<$> relinkForks forks