[Haskell-cafe] Top-level TVars

[Simon Peyton-Jones]

newTVarIO in the HEAD, and therefore it's in any nightly-build snapshot,
which you can freely download.

The next major release will be 6.6, but it's a few months off.
Meanwhile I hope you can use the workaround that Tomasz posted.

Simon

| -----Original Message-----
| From: haskell-cafe-bounces at haskell.org
[mailto:haskell-cafe-bounces at haskell.org] On Behalf Of Joel
| Reymont
| Sent: 13 December 2005 18:08
| To: Haskell-Cafe Cafe
| Subject: [Haskell-cafe] Top-level TVars
| 
| 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.
|  >
| 
| --
| http://wagerlabs.com/
| 
| 
| 
| 
| 
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