Hello, I recently had to work with XSI shared memory objects using Boost, and I noticed that their is no implementation of the message_queue class on top of XSI shared memory objects. So I have created a new file xsi_message_queue.hpp (attached) defining this type of message queue. It is mostly based on the structures and classes defined in message_queue.hpp (in particular the messages, message headers, etc. and the mutex mechanism used in message_queue). It works fine in my project, but should certainly be more extensively tested if you want to integrate it in a future release. I noticed that contrary to other structures of the Interprocess library, message_queue is not very generic: you cannot simply change a template argument to make it work properly with XSI or Windows shared memory objects. Maybe a good step forward to improve it would be to make it more generic. -- Matthieu Dorier ENS Cachan, antenne de Bretagne Département informatique et télécommunication http://perso.eleves.bretagne.ens-cachan.fr/~mdori307/wiki/