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Affirmer understands and acknowledges that Creative Commons is not a + party to this document and has no duty or obligation with respect to + this CC0 or use of the Work. diff --git a/ChangeLog b/ChangeLog new file mode 100644 --- /dev/null +++ b/ChangeLog @@ -0,0 +1,17 @@ +The changes are recorded by the version control system, Darcs. To see a log +quickly from the terminal, run: + + $ darcs changes --repo http://hub.darcs.net/fr33domlover/time-out + +There is also a web interface at which, among other +things, can display the history log. + +To see the log in a local clone, first get a copy of the repository if you +haven't yet: + + $ darcs get http://hub.darcs.net/fr33domlover/time-out + +Then move into the newly created directory and run darcs: + + $ cd time-out + $ darcs changes diff --git a/INSTALL.md b/INSTALL.md new file mode 100644 --- /dev/null +++ b/INSTALL.md @@ -0,0 +1,12 @@ +Install from Hackage/Stackage: + + $ stack install time-out + +Install from unpacked release tarball or source repo: + + $ cd time-out + $ stack install + +Just play with it without installing: + + $ stack repl diff --git a/NEWS.md b/NEWS.md new file mode 100644 --- /dev/null +++ b/NEWS.md @@ -0,0 +1,23 @@ +This file lists the user-visible interesting changes between releases. For a +full list of changes to the source, see the ChangeLog. + + + +time-out 0.1 2016-03-17 +============================== + +General, build and documentation changes: + +* (This is the first release, so everything is new) + +New APIs, features and enhancements: + +* (This is the first release, so everything is a new feature) + +Bug fixes: + +* (This is just the first release, many bugs haven't been discovered yet) + +Dependency changes: + +* (This is the first release) diff --git a/README.md b/README.md new file mode 100644 --- /dev/null +++ b/README.md @@ -0,0 +1,14 @@ +See the .cabal file for more info and link to project website the version +control. + +The official download location is Hackage: + + + +This library is free software, and is committed to software freedom. It is +released to the public domain using the CC0 Public Domain Dedication. For the +boring "legal" details see the file 'COPYING'. + +See the file 'INSTALL' for hints on installation. The file 'ChangeLog' explains +how to see the history log of the changes done in the code. 'NEWS' provides a +friendly overview of the changes for each release. diff --git a/Setup.hs b/Setup.hs new file mode 100644 --- /dev/null +++ b/Setup.hs @@ -0,0 +1,2 @@ +import Distribution.Simple +main = defaultMain diff --git a/src/Control/TimeOut.hs b/src/Control/TimeOut.hs new file mode 100644 --- /dev/null +++ b/src/Control/TimeOut.hs @@ -0,0 +1,80 @@ +{- This file is part of time-out. + - + - Written in 2016 by fr33domlover . + - + - ♡ Copying is an act of love. Please copy, reuse and share. + - + - The author(s) have dedicated all copyright and related and neighboring + - rights to this software to the public domain worldwide. This software is + - distributed without any warranty. + - + - You should have received a copy of the CC0 Public Domain Dedication along + - with this software. If not, see + - . + -} + +module Control.TimeOut + ( timeout + , delay + ) +where + +import Control.Concurrent +import Control.Monad (when) +import Control.Monad.Catch +import Control.Monad.IO.Class +import Data.List (genericReplicate) +import Data.Maybe (isJust) +import Data.Time.Units + +data Timeout = Timeout deriving Show + +instance Exception Timeout + +-- | If the action succeeds, return 'Just' the result. If a 'Timeout' exception +-- is thrown during the action, catch it and return 'Nothing'. Other exceptions +-- aren't caught. +catchTimeout :: (MonadIO m, MonadCatch m) => m a -> m (Maybe a) +catchTimeout action = catch (Just <$> action) $ \ Timeout -> return Nothing + +-- | Run a monadic action with a time limit. If it finishes before that time +-- passes and returns value @x@, then @Just x@ is returned. If the timeout +-- passes, the action is aborted and @Nothing@ is returned. If the action +-- throws an exception, it is aborted and the exception is rethrown. +-- +-- >>> timeout (3 :: Second) $ delay (1 :: Second) >> return "hello" +-- Just "hello" +-- +-- >>> timeout (3 :: Second) $ delay (5 :: Second) >> return "hello" +-- Nothing +-- +-- >>> timeout (1 :: Second) $ delay "hello" +-- *** Exception: hello +timeout :: (TimeUnit t, MonadIO m, MonadCatch m) => t -> m a -> m (Maybe a) +timeout time action = do + tidMain <- liftIO myThreadId + tidTemp <- liftIO $ forkIO $ delay time >> throwTo tidMain Timeout + result <- catchTimeout action `onException` liftIO (killThread tidTemp) + when (isJust result) $ liftIO $ killThread tidTemp + return result + +delayInt :: MonadIO m => Int -> m () +delayInt usec = liftIO $ threadDelay usec + +delayInteger :: MonadIO m => Integer -> m () +delayInteger usec = + if usec > 0 + then do + let maxInt = maxBound :: Int + (times, rest) = usec `divMod` toInteger maxInt + sequence_ $ genericReplicate times $ delayInt maxInt + delayInt $ fromInteger rest + else return () + +-- | Suspend the current thread for the given amount of time. +-- +-- Example: +-- +-- > delay (5 :: Second) +delay :: (TimeUnit t, MonadIO m) => t -> m () +delay = delayInteger . toMicroseconds diff --git a/time-out.cabal b/time-out.cabal new file mode 100644 --- /dev/null +++ b/time-out.cabal @@ -0,0 +1,41 @@ +name: time-out +version: 0.1 +cabal-version: >=1.10 +build-type: Simple +license: PublicDomain +license-file: COPYING +copyright: ♡ Copying is an act of love. Please copy, reuse and share. +maintainer: fr33domlover@riseup.net +homepage: http://hub.darcs.net/fr33domlover/time-out +bug-reports: mailto:fr33domlover@riseup.net +synopsis: Execute a computation with a timeout +description: + This simple library allows you to execute a computation with a limit on its + running time. If it finishes within the specified limit, you get the result + it returns. Otherwise, i.e. if it doesn't finish in time, it will be aborted + and you'll be notified. +category: Control, Monad, Network +author: fr33domlover +extra-source-files: + AUTHORS + ChangeLog + COPYING + INSTALL.md + NEWS.md + README.md + +source-repository head + type: darcs + location: http://hub.darcs.net/fr33domlover/time-out + +library + exposed-modules: + Control.TimeOut + build-depends: + base >=4.8 && <5, + exceptions >=0.8.2.1, + time-units >=1.0.0, + transformers >=0.4.2.0 + default-language: Haskell2010 + hs-source-dirs: src +