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t20src/mxntbl.b36
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module NMUTBL ( ! Table data base manager
ident = 'X00.02'
) =
begin
! COPYRIGHT (c) DIGITAL EQUIPMENT CORPORATION 1985, 1989.
! ALL RIGHTS RESERVED.
!
! THIS SOFTWARE IS FURNISHED UNDER A LICENSE AND MAY BE USED AND COPIED
! ONLY IN ACCORDANCE WITH THE TERMS OF SUCH LICENSE AND WITH THE
! INCLUSION OF THE ABOVE COPYRIGHT NOTICE. THIS SOFTWARE OR ANY OTHER
! COPIES THEREOF MAY NOT BE PROVIDED OR OTHERWISE MADE AVAILABLE TO ANY
! OTHER PERSON. NO TITLE TO AND OWNERSHIP OF THE SOFTWARE IS HEREBY
! TRANSFERRED.
!
! THE INFORMATION IN THIS SOFTWARE IS SUBJECT TO CHANGE WITHOUT NOTICE
! AND SHOULD NOT BE CONSTRUED AS A COMMITMENT BY DIGITAL EQUIPMENT
! CORPORATION.
!
! DIGITAL ASSUMES NO RESPONSIBILITY FOR THE USE OR RELIABILITY OF ITS
! SOFTWARE ON EQUIPMENT THAT IS NOT SUPPLIED BY DIGITAL.
!++
!
! Facility: LSG DECnet Management
!
! Abstract: This set of routines manages a table data base. This data base
! is a linked list of tables. To the outside world it looks like
! a table manager that has a very large (infinite until memory
! runs out) vector.
!
! Insertion - A free cell in any existing table is assigned
! to the specified value. The index (absolute
! from start of the data base) is returned.
!
! Fetch - A index into the data base is used to search
! for a entry in one of the linked tables.
!
! Delete - A index into the data base is used to search
! for a entry that is to be made available for
! subsequent insertions.
!
! Change - A index into the data base is used to search
! for a entry whose value is changed.
!
! Clear - The storage used by a table data base is released
! to the memory manager.
!
! Max - Return the maximum index currently available
! in the table data base (not necessarily used).
!
! Environment: TOPS20, TOPS10 or MCB RSX task
!
! Author: Steven M. Jenness Creation date: 30-Mar-81
!
! Modified by:
!
!--
!
! Include files
!
library 'MXNLIB'; ! Get all required definitions
!
! Global routines
!
forward routine
NMU$TABLE_ROUTINES; ! Declare global entries
!
! Equated symbols
!
literal
MAX_INDEX_PER_BLOCK = 16;
!
! Structure definitions
!
$field
TABLE_BLOCK_FIELDS =
set
TBL_FIRST = [$integer], ! First index in this block
TBL_LAST = [$integer], ! Last index in this block
TBL_FLAGS = [$bits (MAX_INDEX_PER_BLOCK)], ! Entry allocated flags
TBL_NEXT = [$address], ! Address of next table block
TBL_DATA = [$sub_block (0)] ! Beginning of data array
tes;
literal
TABLE_FIELDS_SIZE = $field_set_size,
TABLE_BLOCK_ALLOCATION =
$field_set_units + (MAX_INDEX_PER_BLOCK * %upval);
macro
TABLE_BLOCK = block [TABLE_FIELDS_SIZE] field (TABLE_BLOCK_FIELDS) %;
macro
TABLE_FLAGS = bitvector [16] %;
!
! External references
!
external routine
NMU$MEMORY_MANAGER;
%global_routine ('NMU$TABLE_CLEAR', TABLE_BASE) : novalue =
!++
! Functional description:
!
! This routine clears a table data base. It releases all
! table blocks to the memory manager.
!
! Formal parameters:
!
! .TABLE_BASE Address of table base cell
!
! Implicit inputs: none
! Implicit outputs:
!
! ..TABLE_BASE is set to zero
!
! Routine value: none
! Side effects: none
!
!--
begin
local
TABLE : ref TABLE_BLOCK,
OLD_TABLE;
TABLE = ..TABLE_BASE;
.TABLE_BASE = 0;
while (OLD_TABLE = .TABLE) neq 0
do
begin
TABLE = .TABLE [TBL_NEXT];
NMU$MEMORY_RELEASE (.OLD_TABLE, TABLE_BLOCK_ALLOCATION);
end;
end; ! End of NMU$TABLE_CLEAR
%global_routine ('NMU$TABLE_INSERT', TABLE_BASE, VALUE) =
!++
! Functional description:
!
! This routine inserts a value into a table data base. It searches
! all the linked tables for a free entry to use. If no free entry
! exists, it creates a new table block and links it at the end of the
! table list. The index returned is used for any future reference
! to the table data base entry.
!
! Formal parameters:
!
! .TABLE_BASE Address of cell containing base address of table list
! .VALUE Fullword value to be inserted into list
!
! Routine value:
!
! Index value into table data base
!
! Side effects: none
!
!--
begin
local
TABLE : ref TABLE_BLOCK,
PREV_TABLE : ref TABLE_BLOCK,
INDEX, LOCAL_INDEX;
!
! Point to the first table block in the table list.
! Indicate that there is no previously seen table block.
!
TABLE = ..TABLE_BASE;
PREV_TABLE = 0;
!
! Search list of table blocks for one that hasn't been
! completely filled. If an unallocated entry is found,
! put the specified value into and flag it taken.
!
until .TABLE eql 0
do
if .TABLE [TBL_FLAGS] eql 0
then
begin
PREV_TABLE = .TABLE;
TABLE = .TABLE [TBL_NEXT];
end
else
begin
bind
FLAGS = TABLE [TBL_FLAGS] : TABLE_FLAGS,
TABLE_DATA = TABLE [TBL_DATA] : vector [MAX_INDEX_PER_BLOCK];
incr I from 1 to MAX_INDEX_PER_BLOCK
do
if .FLAGS [.I - 1] eql 1
then
begin
FLAGS [.I - 1] = 0;
TABLE_DATA [.I - 1] = .VALUE;
return (.TABLE [TBL_FIRST] + .I - 1);
end;
end;
TABLE = NMU$MEMORY_GET (TABLE_BLOCK_ALLOCATION);
if .PREV_TABLE eql 0
then
begin
TABLE [TBL_FIRST] = 1;
.TABLE_BASE = .TABLE;
end
else
begin
TABLE [TBL_FIRST] = .PREV_TABLE [TBL_FIRST] + MAX_INDEX_PER_BLOCK;
PREV_TABLE [TBL_NEXT] = .TABLE;
end;
TABLE [TBL_LAST] = .TABLE [TBL_FIRST] + MAX_INDEX_PER_BLOCK - 1;
TABLE [TBL_FLAGS] = -1;
begin
bind
FLAGS = TABLE [TBL_FLAGS] : TABLE_FLAGS,
TABLE_DATA = TABLE [TBL_DATA] : vector [MAX_INDEX_PER_BLOCK];
FLAGS [0] = 0;
TABLE_DATA [0] = .VALUE;
end;
.TABLE [TBL_FIRST]
end; ! End of NMU$TABLE_INSERT
%global_routine ('NMU$TABLE_FETCH', TABLE_BASE, INDEX, VALUE) =
!++
! Functional description:
!
! This routine gets a fullword value from the specified table data
! base. The index passed is used to search the data base for the
! appropriate value.
!
! Formal parameters:
!
! .TABLE_BASE Address of cell containing base address of table
! .INDEX Index number into data base
!
! Implicit inputs: none
! Implicit outputs:
!
! VALUE Value found in data base
!
! Routine value:
!
! $true Index is valid, output register VALUE contains value
! $false Index is invalid
!
! Side effects: none
!
!--
begin
local
TABLE : ref TABLE_BLOCK;
TABLE = ..TABLE_BASE;
until .TABLE eql 0
do
if (.INDEX geq .TABLE [TBL_FIRST]) and (.INDEX leq .TABLE [TBL_LAST])
then
begin
bind
FLAGS = TABLE [TBL_FLAGS] : TABLE_FLAGS,
TABLE_DATA = TABLE [TBL_DATA] : vector [MAX_INDEX_PER_BLOCK];
if .FLAGS [.INDEX - .TABLE [TBL_FIRST]] eql 0
then
begin
.VALUE = .TABLE_DATA [.INDEX - .TABLE [TBL_FIRST]];
return $true;
end
else
return $false;
end
else
TABLE = .TABLE [TBL_NEXT];
$false
end; ! End of NMU$TABLE_FETCH
%global_routine ('NMU$TABLE_DELETE', TABLE_BASE, INDEX) =
!++
! Functional description:
!
! This routine frees up a specified table data base entry.
!
! Formal parameters:
!
! .TABLE_BASE Address of cell containing base address of table
! .INDEX Index number into data base
!
! Routine value:
!
! $true Index was valid, entry deleted
! $false Index was invalid
!
! Side effects: none
!
!--
begin
local
TABLE : ref TABLE_BLOCK;
TABLE = ..TABLE_BASE;
until .TABLE eql 0
do
if (.INDEX geq .TABLE [TBL_FIRST]) and (.INDEX leq .TABLE [TBL_LAST])
then
begin
bind
FLAGS = TABLE [TBL_FLAGS] : TABLE_FLAGS;
FLAGS [.INDEX - .TABLE [TBL_FIRST]] = 1;
return $true;
end
else
TABLE = .TABLE [TBL_NEXT];
$false
end; ! End of NMU$TABLE_DELETE
%global_routine ('NMU$TABLE_CHANGE', TABLE_BASE, INDEX, VALUE) =
!++
! Functional description:
!
! This routine changes a value associated with a particular
! index in the table data base. It assumes that a value
! was previously inserted and assigned the specified index.
!
! Formal parameters:
!
! .TABLE_BASE Address of cell containing base address of table
! .INDEX Index number into data base
! .VALUE New value to insert
!
! Routine value:
!
! $true Index was valid, value changed
! $false Index was invalid, no change made
!
! Side effects: none
!
!--
begin
local
TABLE : ref TABLE_BLOCK;
TABLE = ..TABLE_BASE;
until .TABLE eql 0
do
if (.INDEX geq .TABLE [TBL_FIRST]) and (.INDEX leq .TABLE [TBL_LAST])
then
begin
bind
FLAGS = TABLE [TBL_FLAGS] : TABLE_FLAGS,
TABLE_DATA = TABLE [TBL_DATA] : vector [MAX_INDEX_PER_BLOCK];
if .FLAGS [.INDEX - .TABLE [TBL_FIRST]] eql 0
then
begin
TABLE_DATA [.INDEX - .TABLE [TBL_FIRST]] = .VALUE;
return $true;
end
else
return $false;
end
else
TABLE = .TABLE [TBL_NEXT];
$false
end; ! End of NMU$TABLE_CHANGE
%global_routine ('NMU$TABLE_MAX', TABLE_BASE) =
!++
! Functional description:
!
! This routine returns the maximum table index currently
! available. It does not imply that the returned value
! is the maximum allocated index.
!
! Formal parameters:
!
! .TABLE_BASE Address of cell containing base address of table
!
! Routine value:
!
! <>0 Maximum table index
! =0 No table yet
!
! Side effects: none
!
!--
begin
local
TABLE : ref TABLE_BLOCK,
HIGHEST_TABLE : ref TABLE_BLOCK;
!
! Start at the beginning table block in the table.
! If no table has been started return a zero max index.
!
if (TABLE = ..TABLE_BASE) eql 0
then return 0;
!
! Search to the end of the table
!
until .TABLE eql 0
do
begin
HIGHEST_TABLE = .TABLE;
TABLE = .TABLE [TBL_NEXT];
end;
!
! Return highest index from last found table block
!
.HIGHEST_TABLE [TBL_LAST]
end; ! End of NMU$TABLE_MAX
end ! End of NMUTBL
eludom