The Hub: The Hub Computer Network Music
Available from www.jstor.org
Page 1
The Hub: The Hub Computer Network Music
19.1
The Hub
The Ultimate Embedded Kernel
All of these kernels essentially try to scale down a traditional OS
Consequently never lose the overhead inherent in the model
Common property of nearly all embedded systems is they are
event driven.
The processes of an embedded system respond to events
All processes are nite-state machines
Multiple processes on a single processor system are just overhead.
Reduce everything to the barest essentials.
Modularity and concurrency can be achieved without the traditional
overhead.
The Hub
The Ultimate Embedded Kernel
All of these kernels essentially try to scale down a traditional OS
Consequently never lose the overhead inherent in the model
Common property of nearly all embedded systems is they are
event driven.
The processes of an embedded system respond to events
All processes are nite-state machines
Multiple processes on a single processor system are just overhead.
Reduce everything to the barest essentials.
Modularity and concurrency can be achieved without the traditional
overhead.
Page 2
19.2
The Hub
The HubQ is a circular buffer of instructions to different tasks.
Tasks represent traditional processes or threads.
Each instruction indicates which TSV it applies to, its instruction opcode
and parameters.
Task State
Vectors (TSV)
Hub
Queue
The Hub
The HubQ is a circular buffer of instructions to different tasks.
Tasks represent traditional processes or threads.
Each instruction indicates which TSV it applies to, its instruction opcode
and parameters.
Task State
Vectors (TSV)
Hub
Queue
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