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SYSTEM
0BJECrS
srRUCTURES
Selected
Index
and
Selected
State
Fields
-
The
selected
index
and
selected
state
fields
are
filled
in
by
the
processor
fram
information
found
in
the
process
carrier
data
segment
at
process
selection
time,
i.
e when a
"select
process"
IPC
is
received.
The
selected
index
is
a
process
selection
index
used
to
conmunicate
to
Attached
Processor
software
which
process
from
the
process
selection
list
has
just
been
bound
to
the
processor.
The
selected
index
is
obtained
from
the
double
byte
quantity
located
at
a
displacement
of
eight
double
bytes
into
the
process
carrier
data
segment. The
selected
state
is
uninterpreted
by
processors
and
is
obtained
from
the
double
byte
quantity
located
at
a
displacement
of
nine
double
bytes
into
the
process
carrier
data
segment.
Processor
Fault
Information
Area
The
organization
of
the
processor
fault
information
area
is
described
in
Appendix C.
Local
and
Global
Communication Segments
Both
local
and
global
oonununication segments
used
by
IPs
have
the
same
format
and
interpretation
as
the
corresponding
objects
employed
by
GDPs.
IPC Message
Field
The IPC message
field
contains
one
of
the
following
function
request
encodings.
Message
codes
0
through
7
represent
IPC
messages
which
are
coll'lIDn
between
GDPs
and
IPs.
Message
codes
15,
16,
and 17
are
messages
specific
to
Interface
Processors.
Message
codes
8
through
14
are
defined
for
GDPs
rut
are
unused by
IPs.
o -
Select
Process
-
Causes
the
processor
to
examine
its
carr
ier
to
determine
if
a
process
was
received.
If
a
process
was
received,
the
process
is
selected,
the
dispatching
flag
is
set,
and
the
selected
state
and
selected
index
fields
are
copied
from
the
process
carrier
data
segment
to
the
control
winda-1. The
current
process
index
field
is
invalidated
when
this
IPC
is
received.
1 -
Start
Processor
2 -
Stop
Processor
3 -
Set
broadcast
acceptance
mode
A-2l