The Caml Hump: Concurrent Cell

'Concurrent Cell' is a library for multi-thread programming with CML(Concurrent ML) style synchronous message passing communications. The Threads library, a part of OCaml, realizes the CML style event value, but does not support shared variables like ivar and mvar. This library implements these variables without creating any new thread. This means that ivar and mvar are lightweight and GC target.