[Haskell-cafe] Interrupting threads and ualarm

ROBERT DOUGLAS HOELZ hoelz at wisc.edu
Fri Nov 23 16:14:53 EST 2007

Hello Haskellers,

I have two questions for you:

* Is there a Haskell binding to the ualarm() function in unistd.h?  I looked in System.Posix.Signals, but there's just a binding for alarm().

* Is there a way to interrupt a blocking operation on another thread?  I thought about throwTo, but that seems like overkill.  Here's some example code:

import Control.Concurrent

main :: IO ()
main = do
    tid <- myThreadId
    forkIO $ interruptMain tid

interruptMain :: ThreadId -> IO ()
interruptMain mainThreadId = do
    threadDelay 5000000
    interrupt mainThreadId -- This is probably going to end up being throwTo, isn't it?

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