Integrated and Modular Systems for Commercial ... - Nonstop Systems

lliedSignal
A E R O S P A C E
Partition Execs
Thread schedulers, driven by event/priority/deadline;
executes strictly within a partition created by K-Exec
User-Mode
software
Kernel-Mode
software
Processor
and I/O
hardware
App 1
Node Software Architecture
App 2
App 3
P-Exec 1 P-Exec 1 P-Exec 1
P-Exec 2
- modified “scheduler activation” type exec -
ref.: A.S. Tanenbaum: “Distributed Operating Systems”, Prentice Hall, 1995, 614 pp., ISBN 0-13-219908-29
App 4
K-Exec
Hardware
Shared Function Libraries
Shared functions in “execute-only”
memory may be used by any partition
App 5
BIT
Kernel Exec
Simple, deterministic, roundrobin
scheduler and partition
management
Lib. 1
Lib. 2
Lib. 3
Host CPU & supporting logic
Interrupt system, MMU, I/O
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