author | nemo |
Sun, 26 Feb 2012 12:56:53 -0500 | |
changeset 6744 | 7a4db08d291d |
parent 5119 | f475e10c4081 |
child 6805 | 097289be7200 |
permissions | -rw-r--r-- |
4905 | 1 |
module Store( |
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ElemIndex(), |
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MStore(), |
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IStore(), |
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newStore, |
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addElem, |
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removeElem, |
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readElem, |
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writeElem, |
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modifyElem, |
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elemExists, |
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firstIndex, |
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indicesM, |
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withIStore, |
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withIStore2, |
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(!), |
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indices |
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) where |
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import qualified Data.Array.IArray as IA |
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import qualified Data.Array.IO as IOA |
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import qualified Data.IntSet as IntSet |
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import Data.IORef |
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import Control.Monad |
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newtype ElemIndex = ElemIndex Int |
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deriving (Eq, Show, Read, Ord) |
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newtype MStore e = MStore (IORef (IntSet.IntSet, IntSet.IntSet, IOA.IOArray Int e)) |
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newtype IStore e = IStore (IntSet.IntSet, IA.Array Int e) |
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firstIndex :: ElemIndex |
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firstIndex = ElemIndex 0 |
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-- MStore code |
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initialSize :: Int |
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5003
db4726bf9205
Implement Store truncating, so the memory even gets freed sometimes
unc0rr
parents:
4932
diff
changeset
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initialSize = 16 |
4905 | 39 |
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growFunc :: Int -> Int |
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growFunc a = a * 3 `div` 2 |
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||
5003
db4726bf9205
Implement Store truncating, so the memory even gets freed sometimes
unc0rr
parents:
4932
diff
changeset
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truncFunc :: Int -> Int |
db4726bf9205
Implement Store truncating, so the memory even gets freed sometimes
unc0rr
parents:
4932
diff
changeset
|
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truncFunc a | a > growFunc initialSize = (a `div` 2) |
db4726bf9205
Implement Store truncating, so the memory even gets freed sometimes
unc0rr
parents:
4932
diff
changeset
|
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| otherwise = a |
db4726bf9205
Implement Store truncating, so the memory even gets freed sometimes
unc0rr
parents:
4932
diff
changeset
|
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4905 | 48 |
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newStore :: IO (MStore e) |
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newStore = do |
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newar <- IOA.newArray_ (0, initialSize - 1) |
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new <- newIORef (IntSet.empty, IntSet.fromAscList [0..initialSize - 1], newar) |
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return (MStore new) |
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growStore :: MStore e -> IO () |
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growStore (MStore ref) = do |
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(busyElems, freeElems, arr) <- readIORef ref |
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(_, m') <- IOA.getBounds arr |
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let newM' = growFunc (m' + 1) - 1 |
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newArr <- IOA.newArray_ (0, newM') |
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sequence_ [IOA.readArray arr i >>= IOA.writeArray newArr i | i <- [0..m']] |
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4932 | 63 |
writeIORef ref (busyElems, freeElems `IntSet.union` IntSet.fromAscList [m'+1..newM'], newArr) |
4905 | 64 |
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growIfNeeded :: MStore e -> IO () |
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growIfNeeded m@(MStore ref) = do |
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(_, freeElems, _) <- readIORef ref |
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when (IntSet.null freeElems) $ growStore m |
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||
5003
db4726bf9205
Implement Store truncating, so the memory even gets freed sometimes
unc0rr
parents:
4932
diff
changeset
|
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truncateIfNeeded :: MStore e -> IO () |
5119 | 73 |
truncateIfNeeded (MStore ref) = do |
5003
db4726bf9205
Implement Store truncating, so the memory even gets freed sometimes
unc0rr
parents:
4932
diff
changeset
|
74 |
(busyElems, _, arr) <- readIORef ref |
db4726bf9205
Implement Store truncating, so the memory even gets freed sometimes
unc0rr
parents:
4932
diff
changeset
|
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(_, m') <- IOA.getBounds arr |
db4726bf9205
Implement Store truncating, so the memory even gets freed sometimes
unc0rr
parents:
4932
diff
changeset
|
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let newM' = truncFunc (m' + 1) - 1 |
5119 | 77 |
when (newM' < m' && (not $ IntSet.null busyElems) && IntSet.findMax busyElems <= newM') $ do |
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newArr <- IOA.newArray_ (0, newM') |
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sequence_ [IOA.readArray arr i >>= IOA.writeArray newArr i | i <- IntSet.toList busyElems] |
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writeIORef ref (busyElems, IntSet.fromAscList [0..newM'] `IntSet.difference` busyElems, newArr) |
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5003
db4726bf9205
Implement Store truncating, so the memory even gets freed sometimes
unc0rr
parents:
4932
diff
changeset
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81 |
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db4726bf9205
Implement Store truncating, so the memory even gets freed sometimes
unc0rr
parents:
4932
diff
changeset
|
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4905 | 83 |
addElem :: MStore e -> e -> IO ElemIndex |
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addElem m@(MStore ref) element = do |
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growIfNeeded m |
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(busyElems, freeElems, arr) <- readIORef ref |
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let (n, freeElems') = IntSet.deleteFindMin freeElems |
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IOA.writeArray arr n element |
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writeIORef ref (IntSet.insert n busyElems, freeElems', arr) |
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return $ ElemIndex n |
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removeElem :: MStore e -> ElemIndex -> IO () |
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5003
db4726bf9205
Implement Store truncating, so the memory even gets freed sometimes
unc0rr
parents:
4932
diff
changeset
|
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removeElem m@(MStore ref) (ElemIndex n) = do |
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(busyElems, freeElems, arr) <- readIORef ref |
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IOA.writeArray arr n (error $ "Store: no element " ++ show n) |
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writeIORef ref (IntSet.delete n busyElems, IntSet.insert n freeElems, arr) |
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5003
db4726bf9205
Implement Store truncating, so the memory even gets freed sometimes
unc0rr
parents:
4932
diff
changeset
|
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truncateIfNeeded m |
4905 | 99 |
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readElem :: MStore e -> ElemIndex -> IO e |
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readElem (MStore ref) (ElemIndex n) = readIORef ref >>= \(_, _, arr) -> IOA.readArray arr n |
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writeElem :: MStore e -> ElemIndex -> e -> IO () |
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writeElem (MStore ref) (ElemIndex n) el = readIORef ref >>= \(_, _, arr) -> IOA.writeArray arr n el |
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modifyElem :: MStore e -> (e -> e) -> ElemIndex -> IO () |
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modifyElem (MStore ref) f (ElemIndex n) = do |
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(_, _, arr) <- readIORef ref |
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IOA.readArray arr n >>= IOA.writeArray arr n . f |
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elemExists :: MStore e -> ElemIndex -> IO Bool |
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elemExists (MStore ref) (ElemIndex n) = do |
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(_, free, _) <- readIORef ref |
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return $ n `IntSet.notMember` free |
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indicesM :: MStore e -> IO [ElemIndex] |
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indicesM (MStore ref) = do |
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(busy, _, _) <- readIORef ref |
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return $ map ElemIndex $ IntSet.toList busy |
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-- A way to see MStore elements in pure code via IStore |
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m2i :: MStore e -> IO (IStore e) |
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m2i (MStore ref) = do |
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(a, _, c') <- readIORef ref |
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c <- IOA.unsafeFreeze c' |
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return $ IStore (a, c) |
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i2m :: MStore e -> IStore e -> IO () |
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i2m (MStore ref) (IStore (_, arr)) = do |
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(b, e, _) <- readIORef ref |
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a <- IOA.unsafeThaw arr |
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writeIORef ref (b, e, a) |
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withIStore :: MStore e -> (IStore e -> a) -> IO a |
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withIStore m f = do |
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i <- m2i m |
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let res = f i |
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res `seq` i2m m i |
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return res |
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withIStore2 :: MStore e1 -> MStore e2 -> (IStore e1 -> IStore e2 -> a) -> IO a |
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withIStore2 m1 m2 f = do |
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i1 <- m2i m1 |
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i2 <- m2i m2 |
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let res = f i1 i2 |
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res `seq` i2m m1 i1 |
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i2m m2 i2 |
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return res |
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-- IStore code |
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(!) :: IStore e -> ElemIndex -> e |
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(!) (IStore (_, arr)) (ElemIndex i) = (IA.!) arr i |
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indices :: IStore e -> [ElemIndex] |
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indices (IStore (busy, _)) = map ElemIndex $ IntSet.toList busy |