Can this be done now or is this a GHC 6.5 feature? My combination of unsafePerformIO with atomically $ newTVar does not seem to be working. Thanks, Joel P.S. What is the ETA for 6.5? On Mon, Dec 05, 2005 at 10:50:13AM -0000, Simon Peyton-Jones wrote:
It turns out to be easy to provide
newTVarIO :: a -> IO (TVar a)
which you can call from inside 'unsafePerformIO'. That means you can allocate top-level TVars without fuss.
On Tue, Dec 13, 2005 at 06:08:23PM +0000, Joel Reymont wrote:
Can this be done now or is this a GHC 6.5 feature?
My combination of unsafePerformIO with atomically $ newTVar does not seem to be working.
Here is an example how you can initialize a top-level STM variable. http://www.uncurry.com/repos/TimeVar/TimeVar.hs It just forks a new thread inside unsafePerformIO, it runs "atomically" in it and passes the result through ordinary MVar. Best regards Tomasz -- I am searching for a programmer who is good at least in some of [Haskell, ML, C++, Linux, FreeBSD, math] for work in Warsaw, Poland
participants (2)
-
Joel Reymont -
Tomasz Zielonka