> I've been working already on a synchronized_value class that is in trunk
[1]. I plan to merge it to release branch as soon as I have finished the
tests and the documentation. You can see some examples in [2] and [3].

> I've take a look to your class and I think my class provides everything
yours provide.

Surely your version has been given more thought.

> My class allows in addition to lock several synchronized values using
the deadlock free lock algorithm as e.g.

I did not understand the unique_synchronize part, though.