Hey folks, Transactions can be parametrized by other transactions. For testing purposes we may want a transaction to pause for two seconds after its calculation. We can define a higher order transaction that does this: (deftransaction sleep-after (seconds transaction) transaction (trans (sleep seconds))) With the counter example loaded (the source can be found in src/examples/counter.lisp) we can now see what happens when two transactions conflict. STM> (defvar *counter* (new 'counter)) *COUNTER* STM> (progn (perform (sleep-after 2 (increment *counter*))) (perform (sleep-after 2 (increment *counter*)))) [debugging output elided...] STM> (value-of (count-of *counter*)) 2 STM> If you looked at the debugging output you would see one of the transactions has retried due to an inconsistent log. I'm sorry that I haven't been posting regularly, but I've been making steady progress. I'm managing to work on it, however small everyday. I'll be posting more regularly this week with snippets like these. Hoan