Researching boost user archives, I see this has been discussed before...but I'm not sure a clear answer was decided. What is the *recommended* way to have several processes synchronize their initialization, before using shared memory. Consider this example problem: 1) several writers to a boost.interprocess.message_queue will use "open_only" and need to wait until the queue is created (otherwise an exception will be thrown). 2) one reader of a boost.interprocess.message_queue will use "open_or_create" and then somehow signal other processes that the queue is now ready to be opened. The question is: what is the recommended way for the signal to be given to the other processes? Brent Arias