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Names: »sddcsys3«
└─⟦a41ae585a⟧ Bits:30001842 SW-save af projekt 1000, Alarm-system
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>fo @üSD.DCSYS.3/2ü@
>a1 Introduction
>a1 Data Structures
>a1 Program Structure
>a2 Coding Principles
This module consists of a central procedure "utility"
that can be called from the coroutines AMH
(alarm message handler), SOTH (service order terminal
handler), ALOPT (alarm operator handler), and
TIMEOUT_HANDLER.
It is called when some work has to be done on one
of the current task incarnations, e.g. when one of the
coroutines above receives a message containing a task
incarnation number different from 0.
The task incarnation number is passed on to utility as
first actual parameter in the call. It must be stated as
second actual parameter whether the call is caused by
TIMEOUT_HANDLER or by another coroutine.
If a message is involved in the call an integer array
containing this message is passed as third parameter.
>ne 27
>sp 25
>fg Communication with surroundings
Utility fetches the task descriptor (a buffer) corresponding
to the task incarnation. From this description it is decided
which of the local task procedures (create_at, create_ac,
and so on) has to be called. When the task procedure has
been executed the buffer (task descriptor) will be returned and
utility ends.
The utility procedure is structured like this:
>ne23
procedure utility (task_inc_no, timeout, mess, zout);
integer task_inc_no;
boolean timeout;
real array mess;
zone zout;
taskdescr: = wait (sem (task_inc_no));
state: = buf. taskdescr. tdstate;
type: = buf. taskdescr. tdtype;
case type of
1: create_at;
2: create_ac;
3: check_at_ac_conn;
4: internal_test1;
5: internal_test2;
6: dc_start_poll_at;
7: pac_start_poll_at;
8: start_poll_ac;
9: dc_stop_poll;
10: pac_stop_poll;
return_buf (taskdescr)
>a2 Modes
>a2 Submodules
Utility involves the following local procedures for the time being:
>ne9
create_at
create_ac
check_at_ac_conn
internal_test1
internal_test2
dc_start_poll_at
pac_start_poll_at
start_poll_ac
dc_stop_poll
pac_stop_poll
It is common to these task procedures that execution of a
single task incarnation may involve several calls of the
procedure in question. The actual number of calls in each
case depends on both the type of the task and data values
concerning the specific task.
Each call of a task procedure results in execution of a
part of this procedure. The procedures are divided into
a number of parts (states) each of which is identified
by a state-number. Normal execution of a task involves
calls of the task procedure with increasing values of the
state variable.
>a3 Create AT
The task procedure create_at will be called in connection with
TIMEOUT_HANDLER. Third parameter is irrelevant in this case.
When an AT is created SOTH will update the database according to the
information given via the terminal and activate a task number. The
corresponding task descriptor will be initialised with task
type 1 indicating create_at, the state number 1, and the
AT-address.
Then the utility-procedure will be called with the task number
given as first actual parameter. Second parameter with the
value false indicates that the calling coroutine is not
TIMEOUT_HANDLER.
The procedure consists of the following actions:
>ne18
Creation of the subscriber in the database;
Send create message (type 6.0) to the ATs TS;
Wait receipt (type 6.1) from ATs TS;
Send code-address message (10.2) to all involved
ACs;
Wait receipts (10.3) from all involved ACs;
Send VCaVCm-table message (10.10) to ATs TS for
each of the above ACs that are not known by this
TS until now;
Wait receipts (10.11) for each 10.10-message;
Send code-address message (10.0) to AT for each AC;
Wait receipt (10.1) for each of the 10.0-messages;
Print order form and confirmation;
Not all of these actions can be executed at once.
It is necessary to wait for the receipts. For this
reason the procedure is divided into states. When
all work in one state has been executed the state
variable in the task description is increased and the
procedure terminates. In this way each
time the procedure is activated work
will be resumed at the proper place.
The procedure is structured like this (a wait is not performed explicitly,
but takes place via a state transition):
>ne55
procedure create_at;
if timeout
then error_reaction
else
case state of
1: initialise buf.taskdescr.dbref;
update the database;
send 6.0-message to ATs TS;
increase buf. taskdescr. tdstate by 1
send timeout;
2: (* 6.1-message received *)
cancel timeout;
for all ACs involved
send 10.2-message to AC;
increase buf. taskdescr. tdstate by 1
send timeout;
3: note receipt of a 10.3-message;
if all 10.3-messages received
then
cancel timeout;
for all ACs not in ATs TSs
VCaVCm-table send 10.10-message
to ATs TS;
increase buf. taskdescr. tdstate by 1
send timeout;
4: note receipt of a 10.11-message;
if all 10.11-messages received
then
cancel timeout;
for all ACs involved
send 10.0-message to AT;
increase buf. taskdescr. tdstate by 1
send timeout;
5: note receipt of a 10.1-message;
if all 10.1-messages received
then
cancel timeout;
print order form;
print confirmation of order;
clear this task
>a3 Create AC
When an alarm centre is to be created AL_OPT updates the
database with information about the new AC and activates
one of the free task incarnations. Then the corresponding task
descriptor is initialised with the task type indicating
create_ac (= 2), state number = 1, and a reference containing
the AC-address.
Utility is called with the task incarnation number as first
actual parameter, and the value false as second actual parameter
indicating that the calling procedure is not TIMEOUT_HANDLER.
Third parameter is irrelevant.
The task procedure has to perform the following jobs:
Update the database;
Send a create-message (7.0) to ACs TS;
Wait receipt (7.1) from TS;
Print result to operator;
Print order form and confirmation;
It is carried out in this way:
>ne20
procedure create_ac;
if timeout
then error_reaction
else
case state of
1: initialise buf.taskdescr.dbref;
update the database;
send 7.0-message to ACs TS;
increase buf. taskdescr. tdstate by 1
send timeout;
2: (* 7.1-message received *)
cancel timeout;
write result to operator;
print order form;
print confirmation of order;
clear this task
>a3 Check AT-AC connection
A task incarnation of type check_at_ac_conn can be
activated by AL_OPT on the operator's request.
One of the free task incarnations is activated and the corresponding
task descriptor initialised with task type 3 indicating
check_at_ac_conn, task state 1, and a reference to the
AT and AC in question as stated by the operator.
Then utility will be called with the actual parameters
task incarnation number and false indicating that the
calling coroutine is not TIMEOUT_HANDLER. Utility calls
the task procedure check_at_ac_conn.
This procedure should:
>ne3
Send 9.2-message to AT;
Wait 9.3-receipt from AT;
Write result to the operator;
Check_at_ac_conn looks like this:
>ne16
procedure check_at_ac_conn;
if timeout
then error_reaction
else
case state of
1: initialise buf. taskdescr. dbref;
send 9.2-message to AT;
increase buf. taskdescr. tdstate by 1
send timeout;
2: (* 9.3-message received *)
cancel timeout;
write result to the operator;
clear this task
>a3 Internal test
Task incarnations performing internal tests (1 or 2)
can also be activated by AL_OPT at the operator's
request. During an activation the task descriptor is
initialised with task type 4 meaning internal test 1
or task type 5 indicating internal test 2. The AT-address
stated by the operator is also placed in the task descriptor.
The procedure internal test 1 sends an 8.0-message to AT,
waits for an 8.1-receipt, and writes the result to the
operator.
The pseudo-code for this is as follows:
>ne16
procedure internal_test 1;
if timeout
then error_reaction
else
case state of
1: initialise buf. taskdescr. dbref;
send 8.0-message to AT;
increase buf. taskdescr. tdstate by 1;
send timeout;
2: (* 8.1-message received *)
cancel timeout;
write result to operator;
clear this task
Analogously, internal test 2 sends an 8.2-message to AT,
waits for an 8.3-receipt, and writes the result:
>ne16
procedure internal_test 2;
if timeout
then error_reaction
else
case state of
1: initialise buf. taskdescr. dbref;
send 8.2-message to AT;
increase buf. taskdescr. tdstate by 1;
send timeout
2: (* 8.3-message received *)
cancel timeout;
write result to operator;
clear this task
>a3 DC-start poll of AT
When the operator at DC gives his permission to start
polling an AT, AL_OPT will activate a task incarnation
with task type 6 indicating dc_start_poll_at.
The task procedure dc_start_poll_at accomplishes the
following:
>ne 6
Set DC-permission to 'start';
Send DC-permission-message (6.4) to PAC;
If PAC-permission is 'start'
then send start-poll message (9.0) to AT
wait 9.1-message from AT
write result to operator
The procedure will be programmed following this structure:
>ne23
procedure dc_start_poll_at;
if timeout
then error_reaction
else
case state of
1: initialise buf. taskdescr. dbref;
set DC-permission bit;
send DC-permission-message (6.4) to PAC;
if PAC-permission is 'start'
then
send start-poll message (9.0) to AT;
increase buf. taskdescr. tdstate by 1;
send timeout
else clear this task
2: (* 9.1-message from AT received *)
cancel timeout;
write result to operator
clear this task
>a3 PAC-start poll of AT
When PAC gives permission to start polling an AT AMH
will receive a PAC-permission message (6.4). On receipt
of this message AMH activates a task incarnation setting
task type to 7 indicating pac_start_poll_at.
Utility is called with 3rd actual parameter referencing the
the 6.4-message.
The object of the task procedure pac_start_poll_at is
to do this:
>ne6
Set PAC-permission to 'start';
Write PAC-permission to DC-operator;
If DC-permission is 'start'
then send start-poll message (9.0) to AT
wait 9.1-message from AT
write result to operator
The procedure will be programmed following this structure:
>ne22
procedure pac_start_poll_at;
if timeout
then error_reaction
else
case state of
1: initialise buf. taskdescr. dbref;
set PAC-permission to 'start';
write PAC-permission to DC-operator;
if DC-permission is 'start'
then
send start-poll message (9.0) to AT;
increase buf. taskdescr. tdstate by 1;
send timeout
else clear this task
2: (* 9.1-message received *)
cancel timeout;
write result to operator;
clear this task
>a3 Start poll of AC
A task incarnation of type start_poll_ac can be started
by AL_OPT at request from the operator. The task type
in the task descriptor gets the value 8.
The task procedure start_poll_ac sends a start-poll
message (9.0) to AC, waits for a receipt (9.1), and
writes the result to the operator:
>ne16
procedure start_poll_ac;
if timeout
then error_reaction
else
case state of
1: initialise buf. taskdescr. dbref;
send start poll message (9.0) to AC;
increase buf. taskdescr. tdstate by 1;
send timeout
2: (* 9.1-message received *)
cancel timeout;
write result to operator;
clear this task
>a3 Service poll and stop poll of AT
When the operator at DC gives permission to stop or service
poll, AL_OPT activates a task incarnation with task type 9
indicating dc_stop_poll.
The method used by the system to stop poll is quite
analogous to the method used for service poll, the
only difference being in the update part of some of the
messages. However, PAC does not distinguish between stop
poll and service poll, so the messages sent between DC
and PAC indicates stop poll in both cases.
DC-stop poll:
set DC-permission to 'stop' or 'service';
if poll-value= 'start'
then send stop-request (6.4) to PAC;
wait a given timeout period
if PAC-permission is still 'start'
then set DC-permission to 'start'
else if poll-value= DC-permission
then write this to operator
else send stop-poll message (9.0) to AT
wait 9.1 answer
update the database
write result to operator
Transition from polling an AT to stop or service poll requires
permission (a 6.4-message) from both DC-operator and PAC. The
stop poll-message from DC should be sent before the stop
poll-message from PAC. Permission to stop poll from PAC
starts a task of type pac_stop_poll.
A 6.4-message from PAC permitting stop poll while DC-persission
has the value 'start' is considered an error. If DC-permission
is 'stop' or 'service' this message will set PAC-permission
to 'stop' and trigger stop or service poll.
PAC-stop poll:
if DC-permission= 'stop' or 'service'
then set PAC-permission to 'stop';
send stop poll-message (9.0) to AT;
wait 9.1-answer;
update the database;
write result to operator
else write error message to operator
The tasks are programmed according to this structure:
>ne 30
procedure dc_stop_poll;
if timeout
then if state= 1
then if PAC-permission is 'start'
then set DC-permission to 'start';
write result to operator;
clear this task
else error_reaction
else
case state of
1: initialise buf.taskdescr.dbref;
set DC-permission to 'stop' or 'service';
if ATs poll-value= 'start'
then send 6.4-message to PAC;
send timeout
else if AT's poll-value= DC-permission
then write this to operator
else send stop-poll message (9.0) to AT;
increase buf. taskdescr. tdstate by 1;
send timeout
2: (* 9.1-message received *)
cancel timeout;
update the database;
write result to operator
clear this task
>ne22
procedure pac_stop_poll;
if timeout
then error_reaction
else
case state of
1: initialise buf. taskdescr. dbref;
if DC-permission= 'stop' or 'service'
then set PAC-permission to 'stop';
send stop poll-message (9.0) to AT;
increase buf. taskdescr. tdstate by 1;
send timeout;
else write error message to operator;
clear this task
2: (* 9.1-message received *)
cancel timeout;
update the database;
write result to operator;
clear this task
>a3 Connect AT-AAC
The task for connecting an AT to an alternative AC can be started
from AL_OPT initia_lizing the task descriptor with task type
connect_at_aac (=11) and task state 1.
AT must be created already. Information about AT-address,
AAC-address, AC-code, block length, and steer permission must be
supplied by the operator.
The following will be performed:
>ne15
Database operations;
Send 10.4-message til AAC to update AACs
ATTS-table; wait receipt;
If AAC was not in ACaACm-table for ATs TS
then send 10.10-message to ATs TS; wait
receipt;
Send 10.0-message to AT to insert AAC in
the AC-address-table; wait receipt;
If AT is not in AACs AT-address-table then
send 10.2-message to AAC to insert AT in
AACs AT-address-table; wait receipt;
It is programmed in this way:
procedure connect_at_acc;
>ne6
if timeout
then error_reaction
else
case state of
>ne12
1: if AC is not in ACaACm-table for ATs TS
then insert AC;
modify/insert in ACs ATTS-table;
insert AC in ATs ACaddr-table;
if AT is not in ACs ATaddr-table
then insert it;
send 10.4-message to AC to modify/insert
a record in ACs ATTS-table;
send timeout;
increase buf.taskdescr.tdstate by 1;
>ne13
2: <* 10.5-message received *>
cancel timeout;
if AC was not in ACaACm-table for ATs TS
then
send 10.10-message to ATs TS to insert AC
in ACaACm-table;
increase buf.taskdescr.tdstate by 1
else
send 10.0-message to AT to insert AC
in ATs ACaddr-table;
increase buf.taskdescr.tdstate by 2;
send timeout;
>ne8
3: <* 10.11-message received *>
cancel timeout;
send 10.0-message to AT to insert AC
in ATs ACaddr-table;
send timeout;
increase buf.taskdescr.tdstate by 1;
>ne13
4: <* 10.1-message received *>
cancel timeout;
if AT was not in ACs ATaddr-table then
send 10.2-message to AC to insert AT
in ACs ATaddr-table;
send timeout;
increase buf.taskdescr.tdstate by 1;
else
update database;
write result to operator;
clear this task;
>ne6
5: <* 10.3-message received *>
cancel timeout;
update database;
write result to operator;
clear this task;
>a3 Disconnect AT-AAC
The operator at DC can activate a disconnection of an AT from
an entry of an alternative AC. Then AL_OPT initializes task descriptor with task
type disconnect_at_aac (=20) and task state 1.
The AT-address and the AC-code must be stated in the call. It is
necessary to state the AC-code instead of AC-address in order to identify
the entry in ATs ACaddr-table to be removed.
If the entry exists in ATs ACaddress-table the following will
be performed:
>ne18
Database operations;
Send 10.0-message to ATs TS removing the
entry in ATs ACaddress-table; wait receipt;
Send 10.4-message to AAC to modify or remove
the record describing ATs TS in the ATTS-table;
wait receipt;
If all AC-addresses in ATs ACaddress-table <>
this AAC-address then
Send 10.2-message to AAC to remove ATs
record in ACs ATaddress-table; wait
receipt;
If this was ACs only AT at that TS then
send 10.10-message to ATs TS to remove
ACs record in the ACaACm-table; wait
receipt;
>ne 18
procedure disconnect_at_aac;
if timeout
then error_reaction
else
case state of
1: delete AT from ACs ATaddr-table;
delete ACcode from ATs ACaddr-table;
modify/delete ATs TSs record in ACs ATTS-table;
if ATs TSs record is deleted above
then delete AC in ACaACm-table for ATs TS;
send 10.0-message to AT to delete AC-code
from ATs ACaddr-table;
send timeout;
increase buf.taskdescr.tdstate by 1;
>ne8
2: <* 10.1-message received *>
cancel timeout;
send 10.4-message to AC to modify/delete the
entry for ATs TS in ACs ATTS-table;
send timeout;
increase buf.taskdescr.tdstate by 1;
>ne14
3: <* 10.5-message received *>
cancel timeout;
if all AC-addresses in ATs ACaddr-table
<> this AC-address
then
send 10.2-message to AC to remove ATs
entry in ACs ATaddr-table;
send timeout;
increase buf.taskdescr.tdstate by 1;
else
update database;
write result to operator;
clear this task;
>ne14
4: <* 10.3-message received *>
cancel timeout;
if the entry for ATs TS in ACs ATTS-table
is deleted
then
send 10.10-message to ATs TS to delete
ACs record in the ACaACm-table;
send timeout;
increase buf.taskdescr.tdstate by 1;
else
update database;
write result to operator;
clear this task;
>ne6
5: <* 10.11-message received *>
cancel timeout;
update database;
write result to operator;
clear this task;
>a3 Close down AT
A task incarnation of type close_down_at (=12) can be
acti_vated by AL_OPT.
The AT-address is supplied by the operator. The AT must be created
and it must not be con_nected to any alter_native ACs.
If these conditions are satisfied, the following will be per_formed:
Dataoperations;
Send 6.6-message to PAC asking for per_mission to close down;
wait receipt;
if permission granted then
Send 6.8-message to ATs TS to close
down the AT; wait receipt;
Send 10.4-message to PAC to update/
remove an entry to the ATTS-table;
wait receipt;
Send 10.2-message to PAC to remove
the AT from the ATaddress-table;
wait receipt;
If AT was PAC's only AT at that TS
then
Send 10.10-message to AT's TS to
remove PAC from the ACaACm-table;
wait receipt;
The procedure is structured like this:
>ne22
procedure close_down_at;
if timeout
then error_reaction
else
case state of
1: delete AT from PACs ATaddr-table;
delete AT from TSs AT-table;
delete AT from TSs lamportable;
delete PAC from ATs ACaddr-table;
modify/delete ATs TSs record in
PACs ATTS-table;
if AT is PACs only AT at that TS
then delete PAC in ACaACm-table
for ATs TS;
send 6.6-message to PAC;
send timeout;
increase buf.taskdescr.tdstate by 1
2: <* 6.7-message received *>
cancel timeout;
if permission granted
then
send 6.8-message to ATs TS to
close down AT;
send timeout;
increase buf.taskdescr.tdstate by 1
else
write result to operator;
clear this task;
3: <* 6.9-message received *>
cancel timeout;
send 10.4-message to PAC to
update/delete an entry in ATTS-table;
send timeout;
increase buf.taskdescr.tdstate by 1
4: <* 10.5-message received *>
cancel timeout;
send 10.2-message to PAC to remove AT from
the ATaddr-table
send timeout;
increase buf.taskdescr.tdstate by 1;
5: <* 10.3-message received *>
cancel timeout;
if AT was PAC's only AT at that TS
then
send 10.10-message to ATs TS to
remove PAC from the
ACaACm-table;
send timeout;
increase buf.taskdescr.tdstate by 1;
else
write result to operator;
clear this task;
6: <* 10.11-message received *>
cancel timeout;
update the database;
write result to operator;
clear this task;
>a3 Close down AC
A task incarnation of type close_down_ac (=13)
is acti_vated by AL_OPT.
The AC-address is supplied by the operator. The AC must be
created and must not be primary or alternative AC for any AT.
The following is performed:
Databaseoperations;
Send 7.2-message to AC asking for
permission to close down; wait
receipt;
If permission granted then
Send 7.4-message to ACs TS to
close down AC; wait receipt;
The procedure is structured like this:
>ne15
procedure close_down_ac;
if timeout
then error_reaction
else
case state of
1: delete AC from ACAT-table;
delete AC from lamportable;
check that ACs ATADDR-table is empty;
send 7.2-message to AC;
send timeout;
increase buf.taskdescr.tdstate by 1
>ne11
2: <* 7.3-message received *>
cancel timeout;
if permission granted
then
send 7.4-message to ACs TS
send timeout;
increase buf.taskdescr.tdstate by 1
else
write result to operator;
clear this task;
>ne 5
3: <* 7.5-message received *>
cancel timeout;
update database;
write result to operator;
clear this task;
>a3 Create TS
A task incarnation with task type create_ts (=14) is started as a
result of typing the command "<altso" on the operator console.
The task descriptor should be initialized with the alarm macro
address of the logical TS and the alarm macro address of the physical
machine for this TS.
The operations to be performed depend on whether the physical machine
contains a logical machine (DC, NC, or TS) already. This is the case
if and only if the macro addresses of the two machines differ.
The task procedure performs the following:
Update the database;
Send a 10.12-message conc. the TS to DC's
netconnector; wait receipt;
If DC <> physical machine for the TS then
send a 10.12-message to netconnector in
physical machine concerning TS's alarm and
paxnet addresses; wait receipt;
If logical machine = physical machine then
Send 10.12-message to DC's netconnector
to modify the TS-address; wait receipt;
Send 10.12-message to TS's netconnector
describing DC as global exit; wait receipt;
If NC is not in paxtable of physical machine
for TS, then send 10.12-message to netconnector
in physical machine concerning NC; wait receipt;
If TS is not in paxtable of NC's physical
machine, then send 10.12-message to netconnector
in NC's physical machine concerning TS; wait receipt;
Send 11.0-message to TS-supervisor; wait receipt;
It is programmed like this:
>ne10
procedure create_ts;
if timeout
then error_reaction
else
case state of
>ne 26
1: insert tsid-record in the database;
insert TS as global/local record in paxtable
for DC;
if physical TS <> DC then
if physical TS = logical TS then
insert TS as own record in paxtable for TS;
insert DC as global exit in paxtable for TS
else insert TS as local record in paxtable for
physical TS;
if <*physical TS <> physical NC and *> NC is not
in paxtable of physical TS
then insert NC as global record in physical TS;
if physical NC <> DC and physical NC <> physical TS
then insert TS as global record in physical NC;
<* insert TS in DC's paxtable *>
send 10.12-message to DC's netcon describing TS
as next global/local record stating log_macro as
0-0-0 if logical macro = physical macro and logical
macro otherwise;
send timeout;
buf.taskdescr.td_state:= if physical TS <> DC
then 2
else if physical NC <> DC and physical NC <> physical TS
then 6
else 7
>ne 17
2: <* physical TS <> DC *>
<* insert TS as own or local record in physical TS *>
cancel timeout;
send 10.12-message to physical TS describing TS as
own if logical TS = physical TS and local record
otherwise. If logical TS = physical TS then receiver
of this message is 0-0-0-3;
send timeout;
buf.taskdescr.td_state:= if logical TS = physical TS
then 3
else if physical TS <> physical NC
then if NC is not in paxtable of physical TS
then 5
else 6
else 7;
>ne9
3: <* physical TS <> DC and logical TS = physical TS *>
<* modify TS record in DC's paxtable *>
cancel timeout;
send 10.12-message to DC's netcon modifying
TS's log_macro from 0-0-0 to logical TS_macro;
send timeout;
buf.taskdescr.td_state:= 4;
>ne15
4: <* physical TS <> DC and logical TS = physical TS *>
<* insert DC as global exit in (physical) TS's
paxtable *>
cancel timeout;
send 10.12-message to TS's netcon describing
DC as global exit;
send timeout;
buf.taskdescr.tdstate:= if physical TS <>
physical NC
then
if NC is not in paxtable of physical TS
then 5
else 6
else 7;
>ne13
5: <* physical TS <> DC and physical TS <> physical
NC and NC is not in paxtable of physical TS *>
<* insert NC as global record in physical
TS's paxtable *>
cancel timeout;
send 10.12-message to physical TS's netcon
describing NC as global record;
send timeout;
buf.taskdescr.tdstate:= if physical NC <> DC
then 6
else 7;
>ne11
6: <* physical NC <> DC and physical NC <>
physical TS *>
<* insert TS as global record in physical
NC's paxtable *>
cancel timeout;
send 10.12-message to physical NC's netcon
describing TS as global record;
send timeout;
buf.taskdescr.tdstate:= 7;
>ne 6
7: <* send TS-address *>
cancel timeout;
send 11.0-message to TS-supervisor;
send timeout;
buf.taskdescr.tdstate:= 8;
>ne6
8: <* 11.1-message from TS received *>
cancel timeout;
write result to operator;
update database;
clear this task;
>a3 Create NC
When a DC-operator types the command for NC-creation a task
in_carnation with type create_nc (=15) will be started.
The task descriptor should be initialized with the alarm macro
address of the new NC (logical machine) and the alarm macro
address of the physical machine for this NC.
The operations to be performed depend on whether the physical
machine contains a logical machine (DC, NC, or TS) already. This
is the case if and only if the macro addresses of the two
machines differ.
The task procedure performs the following:
Update the database;
Send a 10.12-message (update paxtable) to DC's
netconnector; wait receipt.
If DC <> physical machine then
send a 10.12-message to netconnector
in physical machine containing NC's
addresses; wait receipt.
If the logical macro address = the
physical macro address then
send 10.12-message to DC's netconnector
to modify NC's record in paxtable; wait receipt;
send 10.12-message to NC's netconnector
containing DC-address; wait receipt;
Send 11.0-message to NC-supervisor; wait receipt;
Write result to operator;
It is programmed according to this structure:
>np
procedure create_nc;
if timeout
then error_reaction
else
case state of
1: insert ncid-record in the database;
insert NC as next global/local record in paxtable
for DC;
if logical macro = physical macro
insert NC as own record in paxtable for NC;
insert DC as global exit in paxtable for NC
else if physical macro <> DC macro then
insert NC as local record in paxtable for
physical machine;
send 10.12-message to DC's netcon describing NC
as next global or local record stating log_macro
as 0-0-0 if logical macro = physical macro and
as NC-macro otherwise;
send timeout;
buf.taskdescr.tdstate:= if DC macro <> physical
macro then 2 else 5;
2: <* 10.13-message from DC's netcon received *>
cancel timeout;
send 10.12-message to physical machine describing
NC as own if logical macro = physical macro, and
local otherwise. Receiver of this message is
0-0-0-3, if logical macro = physical macro;
send timeout;
buf.taskdescr.tdstate:= if logical macro = physical
macro then 3 else 5;
>ne8
3: <* 10.13-message from physical machine received *>
<* logical macro = physical macro *>
cancel timeout;
send 10.12-message to DC's netcon modifying
NC's log_macro from 0-0-0 to NC-macro;
send timeout;
buf.taskdescr.tdstate:= 4;
>ne9
4: <* 10.13-message from DC's netcon received *>
<* logical macro = physical macro *>
cancel timeout;
send 10.12-message to NC's netcon describing
DC as global exit;
send timeout;
buf.taskdescr.tdstate:= 5;
>ne5
5: <* 10.13-message from physical machine received *>
cancel timeout;
send 11.0-message to NC-supervisor;
send timeout;
buf.taskdescr.tdstate:= 6;
6: <* 11.1-message from NC received *>
cancel timeout;
write result to operator;
update database;
clear this task;
▶EOF◀