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SYSTEM
OBJECI'S
STRUCIURES
A-
2.
PROCESS
<l3JEC'IS
Logically,
a
process
is
the
execution
by
a
processor
of
an
instruction
stream
within
a
specific
environment.
In
a combined
Attached
Processor/Interface
Processor
system,
the
IP
process
object
extends
the
execution
environment
of
an
AP
process
to
logically
include
a
specific
domain
in
the
432
address
space.
The
execution
p:>int Iroves,
of
course,
as
each
instruction
is
executed
because
a
new
instruction
is
autanatically
specified.
Occasionally,
as
the
result
of
instruction
execution,
a
new
instruction
stream
within
the
Attached
Processor
software
is
specified.
Unless
the
AP
process
should
indicate
its
termination,
the
execution
point
continues
to
Irove
in
this
manner
forever.
There
is
thus
a
close
and
long-term
association
between
the
environment
provided
by an
interface
process
and a
particular
AP
process.
When
a
new
AP
process
specifies
a
function
request,
an
Interface
Processor
makes
the
associated
interface
process'
execution
environment
available.
A
process
obj
ect
is
represented
by
a
process
access
segment and
an
associated
process
data
segment.
Process
Access
Segments
The
hardware-recognized
internal
structure
of
a
process
access
segment
is
shown below.
A-3