Reading and processing upper-layers messages

The VIF, as mentionned above, will have three attached prcesses ; VARP, VIP and VRIP. Added to these processes we have an other processes whose role is to manage interlayer communications ie. packet delivery from upper-layer protocols to the data-link layer. this process is implemented as a loop reading constantly from the VIF module input FIFOs ( 1 fifo per upper-layer protocol ). and once a message is read , it will be sent to the datalink layer using the VDL module primitives.