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Resumen del manual
Rescheduling
a
Process
(PH
Capability
Required)
If
y
our
program
has
PH
capabilit y
,
it
can
call
the
GETPRIORITY
in
trinsic
to
c
hange
its
priority
class
or
the
priorit y
class
of
a
c
hild
pro cess.
A
pro cess
is
sc
heduled
on
the
basis
of
a
particular
priority
class
when
it
is
created.
Generally
,
MPE/iX
sc
hedules
pro cesses
in
linear
or
circular
sub queues:
AS
sub queue,
a
linear
sub queue
con
taining
system
pro cesses
only
BS
sub queue,
a
linear
sub queue
con
taining
pro cesses
of
v
ery
high
priority
CS
sub queue,
a
circular
sub queue
recommended
for
in
teractiv
e
pro cesses
DS
sub queue,
a
circular
sub queue
a
v
ailable
for
general
use
at
a
low
er
priority
than
the
CS
sub queue
and
recommended
for
batc
h
jobs
ES
sub queue,
a
circular
sub queue
op erating
at
a
v
ery
low
priority
(bac
kground)
The
follo wing
is
an
example
of
a
GETPRIORITY
in
trinsic
call:
GETPRIORITY
(PIN,PRIORITYCLASS);
The
parameters
sp ecied
in
the
ab o
v
e
example
are
describ ed
b elow.
PIN
P
asses
the
Pro
cess
Iden
tication
Num
b er
of
the
pro cess
whose
priority
class
is
to
c
hange.
F
or
example,
a
v
alue
of
zero
indicates
the
calling
pro cess.
PRIORITY-
P
asses
a
v
alue
indicating
the
priorit
y
class
in
whic
h
the
sp ecied
pro cess
CLASS
is
resc
heduled.
F
or
example,
the
v
alue
17,235
indicates
that
the
pro cess
is
resc
heduled
in
the
CS
priorit y
class.
Pro
viding
Communication
Betw
een
Processes
Dierent
pro cesses
can
pass
information
among
themselv
es
using
a
sp ecial
feature
of
the
op erating
system,
referred
to
as
In
terpro
cess
Communication
(IPC).
Large
tasks
that
ha
v
e
b een
brok
en
in
to
indep enden
t
pro cesses
can
use
IPC
to
sync
hronize
their
actions
and
exc
hange
data
with
other
pro cesses.
There
are
sev
eral
w
a
ys
y
ou
can
implemen
t
IPC
on
MPE/iX:
Using
le
system
in
trinsics
and
message
les
Using
session-level
v
ariables
and
Job
Con
trol
W
ords
(JCWs)
Using
pro cess
managemen
t
mail
in
trinsics
The
le
system
in
trinsics
HPFOPEN , FOPEN, FREAD,and
FWRITE
pro
vide
the
most
p o
w
erful
metho d
of
p erforming
IPC.
These
in
trinsics
can
b e
used
to
comm
unicate
b et
w
een
an
y
user
pro cess;
the
pro cesses
do
not
need
to
b e
in
the
same
pro cess
tree,
or
running
in
the
same
job
or
session.
Pro
cesses
executing
in
the
same
job
or
session
can
use
a
session-level
v
ariable
or
JCW
to
pass
smaller
amoun
ts
of
data
more
ecien
tly
than
using
message
les.
Some
older
applications
use
the
\mail"
facility
to
comm
unicate
b et
w
een
pro cesses
in
the
same
pro cess
tree
(same
job
or
session).
Eac
h
pro cess
in
the
pro cess
tree
can
use
this
facility
to
pass
information
b et
w
een
itself
and
either
its
paren
t
or
c
hild
pro cess.
F
or
more
information
ab out
using
IPC
features
to
pro
vide
comm
unication
b et
w
een
pro cesses,
refer
to
Interpr
o
c
ess
Communic
ation
Pr
o
gr
ammer's
Guide
(32650-90019).
Process
Management
T
asks
2-11
...Otros modelos de este manual:
Software - MPE/iX 6.5 Operating System (143.08 kb)
Software - MPE/iX 7.0 Operating System (143.08 kb)
Software - MPE/iX 7.5 Operating System (143.08 kb)