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author | Amar Takhar <verm@darkbeer.org> | 2016-01-16 18:26:00 -0500 |
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committer | Amar Takhar <verm@darkbeer.org> | 2016-05-02 20:51:23 -0400 |
commit | ca49bfd73be27cae4a7df00da22e9e7ca5bd8dfa (patch) | |
tree | c7a329992aee5b80126af44ff1e418c28424d429 /networking/network_task_structure.rst | |
parent | Fix markup (diff) | |
download | rtems-docs-ca49bfd73be27cae4a7df00da22e9e7ca5bd8dfa.tar.bz2 |
Split document.
Diffstat (limited to 'networking/network_task_structure.rst')
-rw-r--r-- | networking/network_task_structure.rst | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/networking/network_task_structure.rst b/networking/network_task_structure.rst new file mode 100644 index 0000000..78609dd --- /dev/null +++ b/networking/network_task_structure.rst @@ -0,0 +1,38 @@ +Network Task Structure and Data Flow +#################################### + +A schematic diagram of the tasks and message *mbuf* queues in a +simple RTEMS networking application is shown in the following +figure: + +.. image:: images/networkflow.jpg + + +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. + +.. COMMENT: Written by Eric Norum + +.. COMMENT: COPYRIGHT (c) 1988-2002. + +.. COMMENT: On-Line Applications Research Corporation (OAR). + +.. COMMENT: All rights reserved. + |