sounds as if you need a priority queue, so you can say "give me the message with the earliest time" but otherwise yes. Simon | -----Original Message----- | From: haskell-cafe-bounces@haskell.org [mailto:haskell-cafe-bounces@haskell.org] On Behalf Of Joel | Reymont | Sent: 06 December 2005 11:46 | To: Simon Peyton-Jones | Cc: Haskell Cafe | Subject: [Haskell-cafe] Re: TChan implementation: Why TVarList | | Well, I meant more like TVar [a] but I see that you are pulling from | the front and appending to the rear. | | I need to implement a mailbox where messages can be pulled out based | on a predicate or in order of arrival. I'm thinking of using a Map | keyed on ClockTime. | | Do you have any suggestions? | | Thanks, Joel | | On Dec 6, 2005, at 11:31 AM, Simon Peyton-Jones wrote: | | > The mutable cell is in the tail. A [TVar a] would be quite different. | > You can read about a very similar impl (based on MVars) in the | > original | > "Concurrent Haskell" paper (on my papers page) | | -- | http://wagerlabs.com/ | | | | | | _______________________________________________ | Haskell-Cafe mailing list | Haskell-Cafe@haskell.org | http://www.haskell.org/mailman/listinfo/haskell-cafe