mirror of
https://github.com/barrucadu/dejafu.git
synced 2024-12-18 19:11:37 +03:00
Messy implementation of subconcurrency.
This makes `stepThread` messier, and doesn't actually prevent nesting currently - although it does prevent usage when there are multiple threads, which may be enough.
This commit is contained in:
Michael Walker
parent
68e2372cfc
commit
8fd3e5900b
@ -11,6 +11,7 @@ import Test.HUnit.DejaFu (testDejafu)
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import Control.Concurrent.Classy
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import Control.Monad.STM.Class
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import Test.DejaFu.Conc (Conc, subconcurrency)
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#if __GLASGOW_HASKELL__ < 710
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import Control.Applicative ((<$>), (<*>))
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@ -49,6 +50,13 @@ tests =
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, testGroup "Daemons" . hUnitTestToTests $ test
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[ testDejafu schedDaemon "schedule daemon" $ gives' [0,1]
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]
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, testGroup "Subconcurrency" . hUnitTestToTests $ test
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[ testDejafu scDeadlock1 "deadlock1" $ gives' [Left Deadlock, Right ()]
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, testDejafu scDeadlock2 "deadlock2" $ gives' [(Left Deadlock, ()), (Right (), ())]
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, testDejafu scSuccess "success" $ gives' [Right ()]
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, testDejafu scIllegal "illegal" $ gives [Left IllegalSubconcurrency]
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]
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]
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--------------------------------------------------------------------------------
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@ -207,3 +215,40 @@ schedDaemon = do
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x <- newCRef 0
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_ <- fork $ myThreadId >> writeCRef x 1
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readCRef x
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--------------------------------------------------------------------------------
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-- Subconcurrency
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-- | Subcomputation deadlocks sometimes.
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scDeadlock1 :: Monad n => Conc n r (Either Failure ())
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scDeadlock1 = do
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var <- newEmptyMVar
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subconcurrency $ do
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void . fork $ putMVar var ()
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putMVar var ()
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-- | Subcomputation deadlocks sometimes, and action after it still
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-- happens.
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scDeadlock2 :: Monad n => Conc n r (Either Failure (), ())
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scDeadlock2 = do
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var <- newEmptyMVar
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res <- subconcurrency $ do
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void . fork $ putMVar var ()
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putMVar var ()
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(,) <$> pure res <*> readMVar var
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-- | Subcomputation successfully completes.
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scSuccess :: Monad n => Conc n r (Either Failure ())
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scSuccess = do
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var <- newMVar ()
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subconcurrency $ do
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out <- newEmptyMVar
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void . fork $ takeMVar var >>= putMVar out
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takeMVar out
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-- | Illegal usage
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scIllegal :: Monad n => Conc n r ()
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scIllegal = do
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var <- newEmptyMVar
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void . fork $ readMVar var
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void . subconcurrency $ pure ()
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@ -3,6 +3,7 @@
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module Cases.SingleThreaded where
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import Control.Exception (ArithException(..), ArrayException(..))
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import Control.Monad (void)
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import Test.DejaFu (Failure(..), gives, gives')
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import Test.Framework (Test, testGroup)
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import Test.Framework.Providers.HUnit (hUnitTestToTests)
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@ -10,7 +11,7 @@ import Test.HUnit (test)
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import Test.HUnit.DejaFu (testDejafu)
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import Control.Concurrent.Classy
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import Control.Monad.STM.Class
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import Test.DejaFu.Conc (Conc, subconcurrency)
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import Utils
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@ -58,6 +59,12 @@ tests =
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[ testDejafu capsGet "get" $ gives' [True]
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, testDejafu capsSet "set" $ gives' [True]
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]
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, testGroup "Subconcurrency" . hUnitTestToTests $ test
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[ testDejafu scDeadlock1 "deadlock1" $ gives' [Left Deadlock]
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, testDejafu scDeadlock2 "deadlock2" $ gives' [(Left Deadlock, ())]
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, testDejafu scSuccess "success" $ gives' [Right ()]
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]
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]
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--------------------------------------------------------------------------------
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@ -252,3 +259,22 @@ capsSet = do
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caps <- getNumCapabilities
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setNumCapabilities $ caps + 1
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(== caps + 1) <$> getNumCapabilities
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--------------------------------------------------------------------------------
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-- Subconcurrency
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-- | Subcomputation deadlocks.
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scDeadlock1 :: Monad n => Conc n r (Either Failure ())
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scDeadlock1 = subconcurrency (newEmptyMVar >>= readMVar)
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-- | Subcomputation deadlocks, and action after it still happens.
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scDeadlock2 :: Monad n => Conc n r (Either Failure (), ())
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scDeadlock2 = do
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var <- newMVar ()
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(,) <$> subconcurrency (putMVar var ()) <*> readMVar var
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-- | Subcomputation successfully completes.
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scSuccess :: Monad n => Conc n r (Either Failure ())
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scSuccess = do
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var <- newMVar ()
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subconcurrency (takeMVar var)
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@ -50,12 +50,10 @@ import Control.Exception (MaskingState(..))
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import qualified Control.Monad.Base as Ba
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import qualified Control.Monad.Catch as Ca
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import qualified Control.Monad.IO.Class as IO
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import Control.Monad.Ref (MonadRef, newRef, readRef, writeRef)
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import Control.Monad.Ref (MonadRef,)
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import Control.Monad.ST (ST)
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import Data.Dynamic (toDyn)
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import Data.IORef (IORef)
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import qualified Data.Map.Strict as M
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import Data.Maybe (fromJust)
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import Data.STRef (STRef)
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import Test.DejaFu.Schedule
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@ -63,7 +61,6 @@ import qualified Control.Monad.Conc.Class as C
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import Test.DejaFu.Common
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import Test.DejaFu.Conc.Internal
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import Test.DejaFu.Conc.Internal.Common
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import Test.DejaFu.Conc.Internal.Threading
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import Test.DejaFu.STM
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{-# ANN module ("HLint: ignore Avoid lambda" :: String) #-}
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@ -182,23 +179,9 @@ runConcurrent :: MonadRef r n
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-> s
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-> Conc n r a
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-> n (Either Failure a, s, Trace)
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runConcurrent sched memtype s (C conc) = do
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ref <- newRef Nothing
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let c = runCont conc (AStop . writeRef ref . Just . Right)
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let threads = launch' Unmasked initialThread (const c) M.empty
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(s', trace) <- runThreads runTransaction
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sched
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memtype
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s
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threads
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initialIdSource
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ref
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out <- readRef ref
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pure (fromJust out, s', reverse trace)
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runConcurrent sched memtype s ma = do
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(res, s', trace) <- runConcurrency runTransaction sched memtype s (unC ma)
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pure (res, s', reverse trace)
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-- | Run a concurrent computation and return its result.
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--
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@ -16,12 +16,12 @@
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module Test.DejaFu.Conc.Internal where
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import Control.Exception (MaskingState(..), toException)
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import Control.Monad.Ref (MonadRef, newRef, writeRef)
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import Control.Monad.Ref (MonadRef, newRef, readRef, writeRef)
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import Data.Functor (void)
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import Data.List (sort)
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import Data.List.NonEmpty (NonEmpty(..), fromList)
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import qualified Data.Map.Strict as M
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import Data.Maybe (fromJust, isJust, isNothing, listToMaybe)
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import Data.Maybe (fromJust, fromMaybe, isJust, isNothing, listToMaybe)
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import Test.DejaFu.Common
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import Test.DejaFu.Conc.Internal.Common
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@ -36,6 +36,35 @@ import Test.DejaFu.STM (Result(..))
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--------------------------------------------------------------------------------
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-- * Execution
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-- | Run a concurrent computation with a given 'Scheduler' and initial
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-- state, returning a failure reason on error. Also returned is the
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-- final state of the scheduler, and an execution trace (in reverse
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-- order).
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runConcurrency :: MonadRef r n
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=> (forall x. s x -> IdSource -> n (Result x, IdSource, TTrace))
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-> Scheduler g
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-> MemType
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-> g
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-> M n r s a
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-> n (Either Failure a, g, Trace)
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runConcurrency runstm sched memtype g ma = do
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ref <- newRef Nothing
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let c = runCont ma (AStop . writeRef ref . Just . Right)
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let threads = launch' Unmasked initialThread (const c) M.empty
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(g', trace) <- runThreads runstm
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sched
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memtype
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g
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threads
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initialIdSource
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ref
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out <- readRef ref
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pure (fromJust out, g', trace)
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-- | Run a collection of threads, until there are no threads left.
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--
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-- Note: this returns the trace in reverse order, because it's more
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@ -53,13 +82,13 @@ runThreads runstm sched memtype origg origthreads idsrc ref = go idsrc [] Nothin
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| isNonexistant = die g' InternalError
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| isBlocked = die g' InternalError
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| otherwise = do
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stepped <- stepThread runstm memtype (_continuation $ fromJust thread) idSource chosen threads wb caps
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stepped <- stepThread runstm sched memtype g (_continuation $ fromJust thread) idSource chosen threads wb caps
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case stepped of
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Right (threads', idSource', act, wb', caps') -> loop threads' idSource' act wb' caps'
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Right (threads', idSource', act, wb', caps', mg') -> loop threads' idSource' act (fromMaybe g' mg') wb' caps'
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Left UncaughtException
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| chosen == initialThread -> die g' UncaughtException
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| otherwise -> loop (kill chosen threads) idSource Killed wb caps
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| otherwise -> loop (kill chosen threads) idSource (Right Killed) g' wb caps
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Left failure -> die g' failure
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@ -96,21 +125,28 @@ runThreads runstm sched memtype origg origthreads idsrc ref = go idsrc [] Nothin
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stop outg = pure (outg, sofar)
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die outg reason = writeRef ref (Just $ Left reason) >> stop outg
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loop threads' idSource' act wb' =
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let sofar' = ((decision, runnable', act) : sofar)
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loop threads' idSource' trcOrAct g'' =
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let trc = case trcOrAct of
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Left (act, acts) -> (decision, runnable', act) : acts
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Right act -> [(decision, runnable', act)]
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sofar' = trc++sofar
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threads'' = if (interruptible <$> M.lookup chosen threads') /= Just False then unblockWaitingOn chosen threads' else threads'
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in go idSource' sofar' (Just chosen) g' (delCommitThreads threads'') wb'
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in go idSource' sofar' (Just chosen) g'' (delCommitThreads threads'')
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--------------------------------------------------------------------------------
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-- * Single-step execution
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-- | Run a single thread one step, by dispatching on the type of
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-- 'Action'.
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stepThread :: forall n r s. MonadRef r n
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stepThread :: forall n r s g. MonadRef r n
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=> (forall x. s x -> IdSource -> n (Result x, IdSource, TTrace))
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-- ^ Run a 'MonadSTM' transaction atomically.
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-> Scheduler g
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-- ^ The scheduler.
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-> MemType
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-- ^ The memory model
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-> g
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-- ^ The scheduler state.
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-> Action n r s
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-- ^ Action to step
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-> IdSource
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@ -123,8 +159,8 @@ stepThread :: forall n r s. MonadRef r n
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-- ^ @CRef@ write buffer
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-> Int
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-- ^ The number of capabilities
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-> n (Either Failure (Threads n r s, IdSource, ThreadAction, WriteBuffer r, Int))
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stepThread runstm memtype action idSource tid threads wb caps = case action of
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-> n (Either Failure (Threads n r s, IdSource, Either (ThreadAction, Trace) ThreadAction, WriteBuffer r, Int, Maybe g))
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stepThread runstm sched memtype g action idSource tid threads wb caps = case action of
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AFork n a b -> stepFork n a b
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AMyTId c -> stepMyTId c
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AGetNumCapabilities c -> stepGetNumCapabilities c
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@ -165,8 +201,8 @@ stepThread runstm memtype action idSource tid threads wb caps = case action of
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stepFork :: String
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-> ((forall b. M n r s b -> M n r s b) -> Action n r s)
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-> (ThreadId -> Action n r s)
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-> n (Either Failure (Threads n r s, IdSource, ThreadAction, WriteBuffer r, Int))
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stepFork n a b = return $ Right (goto (b newtid) tid threads', idSource', Fork newtid, wb, caps) where
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-> n (Either Failure (Threads n r s, IdSource, Either z ThreadAction, WriteBuffer r, Int, Maybe g))
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stepFork n a b = return $ Right (goto (b newtid) tid threads', idSource', Right (Fork newtid), wb, caps, Nothing) where
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threads' = launch tid newtid a threads
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(idSource', newtid) = nextTId n idSource
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@ -177,7 +213,7 @@ stepThread runstm memtype action idSource tid threads wb caps = case action of
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stepGetNumCapabilities c = simple (goto (c caps) tid threads) $ GetNumCapabilities caps
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-- | Set the number of capabilities
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stepSetNumCapabilities i c = return $ Right (goto c tid threads, idSource, SetNumCapabilities i, wb, i)
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stepSetNumCapabilities i c = return $ Right (goto c tid threads, idSource, Right (SetNumCapabilities i), wb, i, Nothing)
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-- | Yield the current thread
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stepYield c = simple (goto c tid threads) Yield
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@ -243,12 +279,12 @@ stepThread runstm memtype action idSource tid threads wb caps = case action of
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-- Add to buffer using thread id.
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TotalStoreOrder -> do
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wb' <- bufferWrite wb (tid, Nothing) cref a
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return $ Right (goto c tid threads, idSource, WriteRef crid, wb', caps)
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return $ Right (goto c tid threads, idSource, Right (WriteRef crid), wb', caps, Nothing)
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-- Add to buffer using both thread id and cref id
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PartialStoreOrder -> do
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wb' <- bufferWrite wb (tid, Just crid) cref a
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return $ Right (goto c tid threads, idSource, WriteRef crid, wb', caps)
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return $ Right (goto c tid threads, idSource, Right (WriteRef crid), wb', caps, Nothing)
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-- | Perform a compare-and-swap on a @CRef@.
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stepCasRef cref@(CRef crid _) tick a c = synchronised $ do
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@ -268,7 +304,7 @@ stepThread runstm memtype action idSource tid threads wb caps = case action of
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-- Commit using the cref id.
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PartialStoreOrder -> commitWrite wb (t, Just c)
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return $ Right (threads, idSource, CommitRef t c, wb', caps)
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return $ Right (threads, idSource, Right (CommitRef t c), wb', caps, Nothing)
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-- | Run a STM transaction atomically.
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stepAtom stm c = synchronised $ do
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@ -276,14 +312,14 @@ stepThread runstm memtype action idSource tid threads wb caps = case action of
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case res of
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Success _ written val ->
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let (threads', woken) = wake (OnTVar written) threads
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in return $ Right (goto (c val) tid threads', idSource', STM trace woken, wb, caps)
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in return $ Right (goto (c val) tid threads', idSource', Right (STM trace woken), wb, caps, Nothing)
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Retry touched ->
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let threads' = block (OnTVar touched) tid threads
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in return $ Right (threads', idSource', BlockedSTM trace, wb, caps)
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in return $ Right (threads', idSource', Right (BlockedSTM trace), wb, caps, Nothing)
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Exception e -> do
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res' <- stepThrow e
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return $ case res' of
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Right (threads', _, _, _, _) -> Right (threads', idSource', Throw, wb, caps)
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Right (threads', _, _, _, _, _) -> Right (threads', idSource', Right Throw, wb, caps, Nothing)
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Left err -> Left err
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-- | Run a subcomputation in an exception-catching context.
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@ -328,7 +364,7 @@ stepThread runstm memtype action idSource tid threads wb caps = case action of
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stepMasking :: MaskingState
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-> ((forall b. M n r s b -> M n r s b) -> M n r s a)
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-> (a -> Action n r s)
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-> n (Either Failure (Threads n r s, IdSource, ThreadAction, WriteBuffer r, Int))
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-> n (Either Failure (Threads n r s, IdSource, Either z ThreadAction, WriteBuffer r, Int, Maybe g))
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stepMasking m ma c = simple threads' $ SetMasking False m where
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a = runCont (ma umask) (AResetMask False False m' . c)
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@ -348,14 +384,14 @@ stepThread runstm memtype action idSource tid threads wb caps = case action of
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let (idSource', newmvid) = nextMVId n idSource
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ref <- newRef Nothing
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let mvar = MVar newmvid ref
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return $ Right (goto (c mvar) tid threads, idSource', NewVar newmvid, wb, caps)
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return $ Right (goto (c mvar) tid threads, idSource', Right (NewVar newmvid), wb, caps, Nothing)
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-- | Create a new @CRef@, using the next 'CRefId'.
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stepNewRef n a c = do
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let (idSource', newcrid) = nextCRId n idSource
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ref <- newRef (M.empty, 0, a)
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let cref = CRef newcrid ref
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return $ Right (goto (c cref) tid threads, idSource', NewRef newcrid, wb, caps)
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return $ Right (goto (c cref) tid threads, idSource', Right (NewRef newcrid), wb, caps, Nothing)
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-- | Lift an action from the underlying monad into the @Conc@
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-- computation.
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@ -373,15 +409,16 @@ stepThread runstm memtype action idSource tid threads wb caps = case action of
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stepStop na = na >> simple (kill tid threads) Stop
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-- | Run a subconcurrent computation.
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stepSubconcurrency ma k
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stepSubconcurrency ma c
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| tid /= initialThread = return (Left IllegalSubconcurrency)
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| M.size threads > 1 = return (Left IllegalSubconcurrency)
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-- todo: this case!
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| otherwise = return (Left IllegalSubconcurrency)
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| otherwise = do
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(res, g', trace) <- runConcurrency runstm sched memtype g ma
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return $ Right (goto (c res) tid threads, idSource, Left (Subconcurrency, trace), wb, caps, Just g')
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-- | Helper for actions which don't touch the 'IdSource' or
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-- 'WriteBuffer'
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simple threads' act = return $ Right (threads', idSource, act, wb, caps)
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simple threads' act = return $ Right (threads', idSource, Right act, wb, caps, Nothing)
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-- | Helper for actions impose a write barrier.
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synchronised ma = do
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@ -389,5 +426,5 @@ stepThread runstm memtype action idSource tid threads wb caps = case action of
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res <- ma
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return $ case res of
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Right (threads', idSource', act', _, caps') -> Right (threads', idSource', act', emptyBuffer, caps')
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Right (threads', idSource', act', _, caps', g') -> Right (threads', idSource', act', emptyBuffer, caps', g')
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_ -> res
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