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-@c
-@c Written by Eric Norum
-@c
-@c COPYRIGHT (c) 1988-2002.
-@c On-Line Applications Research Corporation (OAR).
-@c All rights reserved.
-
-@chapter Network Task Structure and Data Flow
-
-A schematic diagram of the tasks and message @b{mbuf} queues in a
-simple RTEMS networking application is shown in the following
-figure:
-
-@ifclear use-html
-@image{networkflow,5in,6in,"Network Task Structure and Data Flow"}
-@end ifclear
-
-@ifset use-html
-@html
-<IMG SRC="networkflow.jpg" ALIGN=CENTER
- ALT="Network Task Structure and Data Flow">
-@end html
-@end ifset
-
-
-The transmit task for each network interface is normally blocked waiting
-for a packet to arrive in the transmit queue. Once a packet arrives, the
-transmit task may block waiting for an event from the transmit interrupt
-handler. The transmit interrupt handler sends an RTEMS event to the transmit
-task to indicate that transmit hardware resources have become available.
-
-The receive task for each network interface is normally blocked waiting
-for an event from the receive interrupt handler. When this event is received
-the receive task reads the packet and forwards it to the network stack
-for subsequent processing by the network task.
-
-The network task processes incoming packets and takes care of
-timed operations such as handling TCP timeouts and
-aging and removing routing table entries.
-
-The `Network code' contains routines which may run in the context of
-the user application tasks, the interface receive task or the network task.
-A network semaphore ensures that
-the data structures manipulated by the network code remain consistent.