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Exit periodic loop if a ROLLBACK fails, to avoid infinite looping when the database server is brought down
author Adam Chlipala <adam@chlipala.net>
date Fri, 18 Mar 2011 09:12:55 -0400
parents f73913d97a40
children
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line source
fun main () : transaction page =
    ch <- channel;
    let
        fun make () =
            subscribe ch;
            send ch "Hello world!"

        fun echo () =
            msg <- recv ch;
            alert(msg);
            echo ()

        fun onload () =
            make ();
            echo ()

        fun haveAnother () =
            send ch "Here's another."
    in
        return <xml><body onload={onload ()}>
          <button value="Another?" onclick={haveAnother ()}/>
        </body></xml>
    end