added a runTimeout function
This adds a dep on haskell's async library, but since that's been added to the recent haskell platform release, it should not be much hardship to my poor long-suffering library chasing users.
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4 changed files with 18 additions and 1 deletions
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@ -11,6 +11,8 @@ module Utility.ThreadScheduler where
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import Common
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import Control.Concurrent
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import Control.Exception
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import Control.Concurrent.Async
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import System.Posix.Terminal
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import System.Posix.Signals
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@ -44,6 +46,19 @@ unboundDelay time = do
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threadDelay $ fromInteger maxWait
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when (maxWait /= time) $ unboundDelay (time - maxWait)
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{- Runs an action until a timeout is reached. If it fails to complete in
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- time, or throws an exception, returns a Left value.
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-
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- Note that if the action runs an unsafe foreign call, the signal to
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- cancel it may not arrive until the call returns. -}
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runTimeout :: Seconds -> IO a -> IO (Either SomeException a)
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runTimeout secs a = do
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runner <- async a
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controller <- async $ do
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threadDelaySeconds secs
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cancel runner
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cancel controller `after` waitCatch runner
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{- Pauses the main thread, letting children run until program termination. -}
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waitForTermination :: IO ()
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waitForTermination = do
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