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SHeap/SHeap
This website contains an archive of files for the Acorn Electron, BBC Micro, Acorn Archimedes, Commodore 16 and Commodore 64 computers, which Dominic Ford has rescued from his private collection of floppy disks and cassettes.
Some of these files were originally commercial releases in the 1980s and 1990s, but they are now widely available online. I assume that copyright over them is no longer being asserted. If you own the copyright and would like files to be removed, please contact me.
| Tape/disk: | Home » Personal collection » Acorn hard disk » unzip_tools » !Infozip |
| Filename: | SHeap/SHeap |
| Read OK: | ✔ |
| File size: | 1EA7 bytes |
| Load address: | 0000 |
| Exec address: | 0000 |
File contents
1REM Sliding_Heap Library
2REM requires SlidingHeap 2.00
3REM module and PROCs
4REM LEN Steven Haslam 1992
5REM updated LEN Harriet Bazley 19th November 2002
6
7ERROR 255,"This is a library; do not attempt to run it directly!"
8
9DEF PROCinitheaps(heapsize%,slidingblocks%)
10REM Call this procedure to create the empty heap before you do anything else
11REM heapsize% defines the initial size of the fixed heap
12REM slidingblocks% defines the maximum possible number of sliding blocks
13
14REM the fixed heap should be used only for blocks which will never change size
15REM and which the programmer wishes to ensure will never slide
16sh_fixedheapsize%=heapsize%
17sh_heap_trigger%=FN_heap_pageup(HIMEM+sh_fixedheapsize%+20+20*slidingblocks%-&8000)
18PROCsetslotsize(sh_heap_trigger%)
19IF FN_heap_slotsize<sh_heap_trigger% THEN ERROR 130,"Unable to initialise heap"
20sh_fixedheapbase%=HIMEM
21sh_slidingheapbase%=HIMEM+sh_fixedheapsize%
22SYS "OS_Heap",0,sh_fixedheapbase%,,sh_fixedheapsize%
23SYS "SlidingHeap_Create",sh_slidingheapbase%,2,slidingblocks%
24SYS "SlidingHeap_VerifyHeap",sh_slidingheapbase%
25ENDPROC
26:
27DEF FNcreate_anchor(name$)
28REM Every sliding block must have an anchor. The block gets moved around
29REM in memory, but its current address can always be found at !anchor%
30REM This function creates an anchor and returns its address for future reference
31REM The name you supply will be used in error messages and heap info reports
32LOCAL space%
33DIM space% 4+LEN name$+1
34!space%=0
35$(space%+4)=name$
36=space%
37:
38DEF PROCcreate_named_sliding_block(anchor%,size%)
39REM This is the function which actually creates a heap block.
40REM First you must have created an anchor for the block.
41LOCAL trysize%
42size%=FN_heap_wordup(size%)
43trysize%=FN_heap_pageup(FN_heap_nextfree+size%-&7FF4)
44IF trysize%>sh_heap_trigger% THEN
45 PROCsetslotsize(trysize%)
46 IF FN_heap_slotsize<trysize% THEN
47 PROCsetslotsize(sh_heap_trigger%)
48 ERROR 131,"Not enough room to create block """+$(anchor%+4)+""""
49 ELSE
50 sh_heap_trigger%=trysize%
51 ENDIF
52ENDIF
53SYS "SlidingHeap_NewBlock",sh_slidingheapbase%,anchor%,size%,anchor%+4
54SYS "SlidingHeap_VerifyHeap",sh_slidingheapbase%
55ENDPROC
56:
57DEF PROCextend_named_sliding_block(anchor%,newsize%)
58REM This function increases (or decreases - the name is misleading) the size
59REM of a heap block. Other blocks may slide around as the block size changes.
60REM If the block did not previously exist, it will be created - so there's not
61REM really a lot of point using PROCcreate_named_sliding_block, I suppose...
62REM Note that newsize% is the TOTAL size of the resulting block, not the
63REM increase/decrease in size - i.e. you need to keep track of the current size.
64LOCAL trysize%,oldsize%,larger%
65IF !anchor%=0 THEN PROCcreate_named_sliding_block(anchor%,newsize%):ENDPROC
66IF !anchor%>FN_heap_nextfree THEN ERROR 129,"Block beyond heap limits"
67newsize%=FN_heap_wordup(newsize%)
68SYS "SlidingHeap_DescribeBlock",sh_slidingheapbase%,anchor% TO ,,oldsize%
69larger%=newsize%>oldsize%
70IF larger% THEN
71 trysize%=FN_heap_pageup(FN_heap_nextfree+(newsize%-oldsize%)-&7FFC)
72 IF trysize%>sh_heap_trigger% THEN
73 PROCsetslotsize(trysize%)
74 IF FN_heap_slotsize<trysize% THEN
75 PROCsetslotsize(sh_heap_trigger%)
76 ERROR 132,"Not enough room to extend block """+$(anchor%+4)+""""
77 ELSE
78 sh_heap_trigger%=trysize%
79 ENDIF
80 ENDIF
81ENDIF
82SYS "SlidingHeap_ExtendBlock",sh_slidingheapbase%,anchor%,newsize%
83trysize%=FN_heap_pageup(FN_heap_nextfree-&7FFC)
84IF trysize%<>sh_heap_trigger% THEN
85 PROCsetslotsize(trysize%)
86 sh_heap_trigger%=trysize%
87ENDIF
88SYS "SlidingHeap_VerifyHeap",sh_slidingheapbase%
89ENDPROC
90:
91DEF PROCscrap_sliding_block(anchor%)
92LOCAL trysize%
93REM This function discards a sliding block, returning its memory to the heap.
94REM Note that the anchor is NOT deleted and can be reused later.
95REM In fact anchors cannot be deleted.
96IF !anchor%=0 THEN ENDPROC
97SYS "SlidingHeap_ScrapBlock",sh_slidingheapbase%,anchor%
98trysize%=FN_heap_pageup(FN_heap_nextfree-&7FFC)
99IF trysize%<>sh_heap_trigger% THEN
100 PROCsetslotsize(trysize%)
101 sh_heap_trigger%=trysize%
102ENDIF
103!anchor%=0
104SYS "SlidingHeap_VerifyHeap",sh_slidingheapbase%
105ENDPROC
106:
107DEF PROCdestroyheaps
108REM This procedure destroys the entire sliding heap.
109LOCAL ptr%,anchor%,slot%
110ptr%=sh_slidingheapbase%+16
111REM start of slots
112FOR slot%=1 TO (sh_slidingheapbase%!4):REM number of slots
113 anchor%=ptr%!4
114 ptr%+=16
115 IF anchor%<>0 THEN !anchor%=0:REM reset anchors in use
116NEXT slot%
117PROCsetslotsize(HIMEM-&8000)
118ENDPROC
119:
120DEF FNsliding_block_size(anchor%)
121REM This function returns the current size of a sliding block
122LOCAL size%
123SYS "SlidingHeap_DescribeBlock",sh_slidingheapbase%,anchor% TO ,,size%
124=size%
125:
126DEF PROCverify_heap
127SYS "SlidingHeap_VerifyHeap",sh_slidingheapbase%
128ENDPROC
129:
130DEF FNincreaseslots(newmax%)
131LOCAL trysize%,size%,slots%
132SYS "SlidingHeap_IncreaseSlots",sh_slidingheapbase%,0 TO ,slots%
133IF newmax%=0 THEN:=slots%
134REM return current heap size
135size%=newmax%-slots%:REM number of slots to increase by
136size%=size%*16:REM extra space needed by these slots
137trysize%=FN_heap_pageup(FN_heap_nextfree+size%-&7FFC)
138IF trysize%>sh_heap_trigger% THEN
139 PROCsetslotsize(trysize%)
140 IF FN_heap_slotsize<trysize% THEN
141 PROCsetslotsize(sh_heap_trigger%)
142 ERROR 133,"Could not increase number of slots in heap"
143 ELSE
144 sh_heap_trigger%=trysize%
145 ENDIF
146ENDIF
147SYS "SlidingHeap_IncreaseSlots",sh_slidingheapbase%,newmax% TO ,newmax%
148SYS "SlidingHeap_VerifyHeap",sh_slidingheapbase%
149=newmax%
150:
151REM Various procedures called by Sliding Heap Library procedures
152DEF FN_heap_slotsize
153LOCAL R0%
154SYS "Wimp_SlotSize",-1,-1 TO R0%
155=R0%
156:
157DEF FN_heap_pageup(n%)
158LOCAL R0%
159SYS "OS_ReadMemMapInfo" TO R0%
160=(n%+R0%-1) AND NOT (R0%-1)
161:
162DEF PROCsetslotsize(newsize%)
163SYS "Wimp_SlotSize",newsize%,-1
164ENDPROC
165:
166DEF FN_heap_nextfree
167LOCAL nextfree%
168SYS "SlidingHeap_NextFree",sh_slidingheapbase% TO nextfree%
169=nextfree%
170:
171DEF FN_heap_wordup(x%)=(x%+3) AND NOT 3
172:
173 REM Sliding_Heap Library
174
175 DEF PROCheap_store(anchor%,RETURN size%,inc%,RETURN ptr%,L%,string$)
176 IF string$<>"" THEN L%=LEN(string$)
177 IF ptr%-!anchor%+L%+1>size% THEN
178 size%+=inc%
179 PROCextend_named_sliding_block(anchor%,size%)
180 ENDIF
181 IF string$<>"" THEN $ptr%=string$:ptr%+=L%:?ptr%=10
182 ENDPROC
183
184 DEF FN_heap_numtostr(d%,n%)=RIGHT$(STRING$(d%,"0")+STR$~n%,d%)
185 DEF FN_heap_snumtostr(d%,n%)=RIGHT$(STRING$(d%," ")+STR$ n%,d%)
186 :
187 DEF PROCheapsinfo(block%)
188 LOCAL bigbloc%,totfree%
189 SYS "OS_Heap",1,sh_fixedheapbase% TO ,,bigbloc%,totfree%
190 PRINT "Fixed heap"
191 PRINT "----- ----"
192 PRINT "Heap base : &";FN_heap_numtostr(8,sh_fixedheapbase%)
193 PRINT "Heap size : ";FN_heap_bytes2(sh_fixedheapsize%)
194 PRINT "Largest free : ";FN_heap_bytes2(bigbloc%)
195 PRINT "Total free : ";FN_heap_bytes2(totfree%)
196 PRINT
197 PRINT "Sliding heap"
198 PRINT "------- ----"
199 SYS "SlidingHeap_HeapInfo",sh_slidingheapbase%
200 ENDPROC
201 :
202 DEF FN_heap_bytes(b%)
203 LOCAL end%
204 SYS "OS_ConvertFixedFileSize",b%,block%,block%+&100 TO ,end%
205 ?end%=13
206 =$block%
207 :
208 DEF FN_heap_bytes2(b%)
209 LOCAL end%
210 SYS "OS_ConvertFileSize",b%,block%,block%+&100 TO ,end%
211 ?end%=13
212 =$block%
213 :
214 DEF FNcreate_fixed_block(size%)
215 LOCAL pointer%,flag%
216 SYS "XOS_Heap",2,sh_fixedheapbase%,,size% TO ,,pointer%;flag%
217 WHILE flag% AND 1
218 PROCextendfixedheap
219 SYS "XOS_Heap",2,sh_fixedheapbase%,,size% TO ,,pointer%;flag%
220 ENDWHILE
221 =pointer%
222 :
223 DEF PROCextendfixedheap
224 LOCAL nshb%,extend%,trysize%
225 SYS "OS_ReadMemMapInfo" TO extend%
226 trysize%=FN_heap_slotsize+extend%
227 PROCsetslotsize(trysize%)
228 IF FN_heap_slotsize<trysize% THEN ERROR 255,"No room to extend fixed heap"
229 nshb%=sh_slidingheapbase%+extend%
230 SYS "SlidingHeap_ShiftHeap",sh_slidingheapbase%,nshb%
231 SYS "OS_Heap",5,sh_fixedheapbase%,,extend%
232 sh_fixedheapsize%+=extend%
233 sh_slidingheapbase%=nshb%
234 SYS "SlidingHeap_VerifyHeap",sh_slidingheapbase%
235 ENDPROC
236 :
� Sliding_Heap Library
� requires SlidingHeap 2.00
� module and PROCs
� � Steven Haslam 1992
1� updated � Harriet Bazley 19th November 2002
B� 255,"This is a library; do not attempt to run it directly!"
*� �initheaps(heapsize%,slidingblocks%)
N� Call this procedure to create the empty heap before you do anything else
:� heapsize% defines the initial size of the fixed heap
J� slidingblocks% defines the maximum possible number of sliding blocks
P� the fixed heap should be used only for blocks which will never change size
@� and which the programmer wishes to ensure will never slide
sh_fixedheapsize%=heapsize%
Rsh_heap_trigger%=�_heap_pageup(�+sh_fixedheapsize%+20+20*slidingblocks%-&8000)
"�setslotsize(sh_heap_trigger%)
J� �_heap_slotsize<sh_heap_trigger% � � 130,"Unable to initialise heap"
sh_fixedheapbase%=�
+sh_slidingheapbase%=�+sh_fixedheapsize%
7ș "OS_Heap",0,sh_fixedheapbase%,,sh_fixedheapsize%
@ș "SlidingHeap_Create",sh_slidingheapbase%,2,slidingblocks%
3ș "SlidingHeap_VerifyHeap",sh_slidingheapbase%
�
:
� �create_anchor(name$)
L� Every sliding block must have an anchor. The block gets moved around
H� in memory, but its current address can always be found at !anchor%
R� This function creates an anchor and returns its address for future reference
N� The name you supply will be used in error messages and heap info reports
� space%
!� space% 4+� name$+1
"
!space%=0
#$(space%+4)=name$
$ =space%
%:
&0� �create_named_sliding_block(anchor%,size%)
'?� This is the function which actually creates a heap block.
(:� First you must have created an anchor for the block.
)� trysize%
* size%=�_heap_wordup(size%)
+7trysize%=�_heap_pageup(�_heap_nextfree+size%-&7FF4)
,!� trysize%>sh_heap_trigger% �
- �setslotsize(trysize%)
." � �_heap_slotsize<trysize% �
/& �setslotsize(sh_heap_trigger%)
0D � 131,"Not enough room to create block """+$(anchor%+4)+""""
1 �
2! sh_heap_trigger%=trysize%
3 �
4�
5Iș "SlidingHeap_NewBlock",sh_slidingheapbase%,anchor%,size%,anchor%+4
63ș "SlidingHeap_VerifyHeap",sh_slidingheapbase%
7�
8:
93� �extend_named_sliding_block(anchor%,newsize%)
:N� This function increases (or decreases - the name is misleading) the size
;P� of a heap block. Other blocks may slide around as the block size changes.
<P� If the block did not previously exist, it will be created - so there's not
=N� really a lot of point using PROCcreate_named_sliding_block, I suppose...
>J� Note that newsize% is the TOTAL size of the resulting block, not the
?R� increase/decrease in size - i.e. you need to keep track of the current size.
@ � trysize%,oldsize%,larger%
AB� !anchor%=0 � �create_named_sliding_block(anchor%,newsize%):�
BA� !anchor%>�_heap_nextfree � � 129,"Block beyond heap limits"
C$newsize%=�_heap_wordup(newsize%)
DKș "SlidingHeap_DescribeBlock",sh_slidingheapbase%,anchor% � ,,oldsize%
E larger%=newsize%>oldsize%
F� larger% �
GG trysize%=�_heap_pageup(�_heap_nextfree+(newsize%-oldsize%)-&7FFC)
H# � trysize%>sh_heap_trigger% �
I �setslotsize(trysize%)
J$ � �_heap_slotsize<trysize% �
K( �setslotsize(sh_heap_trigger%)
LF � 132,"Not enough room to extend block """+$(anchor%+4)+""""
M �
N# sh_heap_trigger%=trysize%
O �
P �
Q�
REș "SlidingHeap_ExtendBlock",sh_slidingheapbase%,anchor%,newsize%
S1trysize%=�_heap_pageup(�_heap_nextfree-&7FFC)
T"� trysize%<>sh_heap_trigger% �
U �setslotsize(trysize%)
V sh_heap_trigger%=trysize%
W�
X3ș "SlidingHeap_VerifyHeap",sh_slidingheapbase%
Y�
Z:
[#� �scrap_sliding_block(anchor%)
\� trysize%
]O� This function discards a sliding block, returning its memory to the heap.
^B� Note that the anchor is NOT deleted and can be reused later.
_(� In fact anchors cannot be deleted.
`� !anchor%=0 � �
a;ș "SlidingHeap_ScrapBlock",sh_slidingheapbase%,anchor%
b1trysize%=�_heap_pageup(�_heap_nextfree-&7FFC)
c"� trysize%<>sh_heap_trigger% �
d �setslotsize(trysize%)
e sh_heap_trigger%=trysize%
f�
g!anchor%=0
h3ș "SlidingHeap_VerifyHeap",sh_slidingheapbase%
i�
j:
k� �destroyheaps
l6� This procedure destroys the entire sliding heap.
m� ptr%,anchor%,slot%
n ptr%=sh_slidingheapbase%+16
o� start of slots
p9� slot%=1 � (sh_slidingheapbase%!4):� number of slots
q anchor%=ptr%!4
r ptr%+=16
s6 � anchor%<>0 � !anchor%=0:� reset anchors in use
t � slot%
u�setslotsize(�-&8000)
v�
w:
x"� �sliding_block_size(anchor%)
y?� This function returns the current size of a sliding block
z � size%
{Hș "SlidingHeap_DescribeBlock",sh_slidingheapbase%,anchor% � ,,size%
|
=size%
}:
~� �verify_heap
3ș "SlidingHeap_VerifyHeap",sh_slidingheapbase%
��
�:
� � �increaseslots(newmax%)
�� trysize%,size%,slots%
�Bș "SlidingHeap_IncreaseSlots",sh_slidingheapbase%,0 � ,slots%
�� newmax%=0 �:=slots%
� � return current heap size
�9size%=newmax%-slots%:� number of slots to increase by
�6size%=size%*16:� extra space needed by these slots
�7trysize%=�_heap_pageup(�_heap_nextfree+size%-&7FFC)
�!� trysize%>sh_heap_trigger% �
� �setslotsize(trysize%)
�" � �_heap_slotsize<trysize% �
�' �setslotsize(sh_heap_trigger%)
�; � 133,"Could not increase number of slots in heap"
� �
�" sh_heap_trigger%=trysize%
� �
��
�Iș "SlidingHeap_IncreaseSlots",sh_slidingheapbase%,newmax% � ,newmax%
�3ș "SlidingHeap_VerifyHeap",sh_slidingheapbase%
� =newmax%
�:
�B� Various procedures called by Sliding Heap Library procedures
�� �_heap_slotsize
� � R0%
�"ș "Wimp_SlotSize",-1,-1 � R0%
�=R0%
�:
�� �_heap_pageup(n%)
� � R0%
� ș "OS_ReadMemMapInfo" � R0%
�=(n%+R0%-1) � � (R0%-1)
�:
� � �setslotsize(newsize%)
�"ș "Wimp_SlotSize",newsize%,-1
��
�:
�� �_heap_nextfree
�� nextfree%
�=ș "SlidingHeap_NextFree",sh_slidingheapbase% � nextfree%
�=nextfree%
�:
�$� �_heap_wordup(x%)=(x%+3) � � 3
�:
� � Sliding_Heap Library
�
�: � �heap_store(anchor%,� size%,inc%,� ptr%,L%,string$)
�" � string$<>"" � L%=�(string$)
�! � ptr%-!anchor%+L%+1>size% �
� size%+=inc%
�1 �extend_named_sliding_block(anchor%,size%)
� �
�4 � string$<>"" � $ptr%=string$:ptr%+=L%:?ptr%=10
� �
�
�0 � �_heap_numtostr(d%,n%)=��d%,"0")+�~n%,d%)
�1 � �_heap_snumtostr(d%,n%)=��d%," ")+� n%,d%)
� :
� � �heapsinfo(block%)
� � bigbloc%,totfree%
�; ș "OS_Heap",1,sh_fixedheapbase% � ,,bigbloc%,totfree%
� � "Fixed heap"
� � "----- ----"
�> � "Heap base : &";�_heap_numtostr(8,sh_fixedheapbase%)
�9 � "Heap size : ";�_heap_bytes2(sh_fixedheapsize%)
�0 � "Largest free : ";�_heap_bytes2(bigbloc%)
�0 � "Total free : ";�_heap_bytes2(totfree%)
� �
� � "Sliding heap"
� � "------- ----"
�2 ș "SlidingHeap_HeapInfo",sh_slidingheapbase%
� �
� :
� � �_heap_bytes(b%)
� � end%
�? ș "OS_ConvertFixedFileSize",b%,block%,block%+&100 � ,end%
�
?end%=13
�
=$block%
� :
� � �_heap_bytes2(b%)
� � end%
�: ș "OS_ConvertFileSize",b%,block%,block%+&100 � ,end%
�
?end%=13
�
=$block%
� :
�! � �create_fixed_block(size%)
� � pointer%,flag%
�@ ș "XOS_Heap",2,sh_fixedheapbase%,,size% � ,,pointer%;flag%
� ȕ flag% � 1
� �extendfixedheap
�@ ș "XOS_Heap",2,sh_fixedheapbase%,,size% � ,,pointer%;flag%
� �
� =pointer%
� :
� � �extendfixedheap
� � nshb%,extend%,trysize%
�% ș "OS_ReadMemMapInfo" � extend%
�% trysize%=�_heap_slotsize+extend%
� �setslotsize(trysize%)
�F � �_heap_slotsize<trysize% � � 255,"No room to extend fixed heap"
�& nshb%=sh_slidingheapbase%+extend%
�9 ș "SlidingHeap_ShiftHeap",sh_slidingheapbase%,nshb%
�. ș "OS_Heap",5,sh_fixedheapbase%,,extend%
� sh_fixedheapsize%+=extend%
� sh_slidingheapbase%=nshb%
�4 ș "SlidingHeap_VerifyHeap",sh_slidingheapbase%
� �
� :
� 00000000 0d 00 01 1a f4 20 53 6c 69 64 69 6e 67 5f 48 65 |..... Sliding_He|
00000010 61 70 20 4c 69 62 72 61 72 79 0d 00 02 1f f4 20 |ap Library..... |
00000020 72 65 71 75 69 72 65 73 20 53 6c 69 64 69 6e 67 |requires Sliding|
00000030 48 65 61 70 20 32 2e 30 30 0d 00 03 16 f4 20 6d |Heap 2.00..... m|
00000040 6f 64 75 6c 65 20 61 6e 64 20 50 52 4f 43 73 0d |odule and PROCs.|
00000050 00 04 1a f4 20 a9 20 53 74 65 76 65 6e 20 48 61 |.... . Steven Ha|
00000060 73 6c 61 6d 20 31 39 39 32 0d 00 05 31 f4 20 75 |slam 1992...1. u|
00000070 70 64 61 74 65 64 20 a9 20 48 61 72 72 69 65 74 |pdated . Harriet|
00000080 20 42 61 7a 6c 65 79 20 31 39 74 68 20 4e 6f 76 | Bazley 19th Nov|
00000090 65 6d 62 65 72 20 32 30 30 32 0d 00 06 04 0d 00 |ember 2002......|
000000a0 07 42 85 20 32 35 35 2c 22 54 68 69 73 20 69 73 |.B. 255,"This is|
000000b0 20 61 20 6c 69 62 72 61 72 79 3b 20 20 64 6f 20 | a library; do |
000000c0 6e 6f 74 20 61 74 74 65 6d 70 74 20 74 6f 20 72 |not attempt to r|
000000d0 75 6e 20 69 74 20 64 69 72 65 63 74 6c 79 21 22 |un it directly!"|
000000e0 0d 00 08 04 0d 00 09 2a dd 20 f2 69 6e 69 74 68 |.......*. .inith|
000000f0 65 61 70 73 28 68 65 61 70 73 69 7a 65 25 2c 73 |eaps(heapsize%,s|
00000100 6c 69 64 69 6e 67 62 6c 6f 63 6b 73 25 29 0d 00 |lidingblocks%)..|
00000110 0a 4e f4 20 43 61 6c 6c 20 74 68 69 73 20 70 72 |.N. Call this pr|
00000120 6f 63 65 64 75 72 65 20 74 6f 20 63 72 65 61 74 |ocedure to creat|
00000130 65 20 74 68 65 20 65 6d 70 74 79 20 68 65 61 70 |e the empty heap|
00000140 20 62 65 66 6f 72 65 20 79 6f 75 20 64 6f 20 61 | before you do a|
00000150 6e 79 74 68 69 6e 67 20 65 6c 73 65 0d 00 0b 3a |nything else...:|
00000160 f4 20 68 65 61 70 73 69 7a 65 25 20 64 65 66 69 |. heapsize% defi|
00000170 6e 65 73 20 74 68 65 20 69 6e 69 74 69 61 6c 20 |nes the initial |
00000180 73 69 7a 65 20 6f 66 20 74 68 65 20 66 69 78 65 |size of the fixe|
00000190 64 20 68 65 61 70 0d 00 0c 4a f4 20 73 6c 69 64 |d heap...J. slid|
000001a0 69 6e 67 62 6c 6f 63 6b 73 25 20 64 65 66 69 6e |ingblocks% defin|
000001b0 65 73 20 74 68 65 20 6d 61 78 69 6d 75 6d 20 70 |es the maximum p|
000001c0 6f 73 73 69 62 6c 65 20 6e 75 6d 62 65 72 20 6f |ossible number o|
000001d0 66 20 73 6c 69 64 69 6e 67 20 62 6c 6f 63 6b 73 |f sliding blocks|
000001e0 0d 00 0d 04 0d 00 0e 50 f4 20 74 68 65 20 66 69 |.......P. the fi|
000001f0 78 65 64 20 68 65 61 70 20 73 68 6f 75 6c 64 20 |xed heap should |
00000200 62 65 20 75 73 65 64 20 6f 6e 6c 79 20 66 6f 72 |be used only for|
00000210 20 62 6c 6f 63 6b 73 20 77 68 69 63 68 20 77 69 | blocks which wi|
00000220 6c 6c 20 6e 65 76 65 72 20 63 68 61 6e 67 65 20 |ll never change |
00000230 73 69 7a 65 0d 00 0f 40 f4 20 61 6e 64 20 77 68 |size...@. and wh|
00000240 69 63 68 20 74 68 65 20 70 72 6f 67 72 61 6d 6d |ich the programm|
00000250 65 72 20 77 69 73 68 65 73 20 74 6f 20 65 6e 73 |er wishes to ens|
00000260 75 72 65 20 77 69 6c 6c 20 6e 65 76 65 72 20 73 |ure will never s|
00000270 6c 69 64 65 0d 00 10 1f 73 68 5f 66 69 78 65 64 |lide....sh_fixed|
00000280 68 65 61 70 73 69 7a 65 25 3d 68 65 61 70 73 69 |heapsize%=heapsi|
00000290 7a 65 25 0d 00 11 52 73 68 5f 68 65 61 70 5f 74 |ze%...Rsh_heap_t|
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