[boost] Interprocess message queue implementation

Hello, I have been looking over the implementation of Boost.Interprocess's message queues, and have become slightly confused as to the reasoning for how it was designed. Assuming my understanding is correct, it allocates a piece of shared memory, and then constructs a message queue within that piece of memory. Is there a reason that this was done in favor over implementing it by using SystemV's message queues ( the one located in <sys/msg.h> )? Thanks, Alex Miller