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src/nucleus: library C code import from FreeNucleus package
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 15 Jul 2018 20:57:33 +0000
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6:8b2a9a374324 7:0f80e1e4dce4
1 /*************************************************************************/
2 /* */
3 /* Copyright Mentor Graphics Corporation 2002 */
4 /* All Rights Reserved. */
5 /* */
6 /* THIS WORK CONTAINS TRADE SECRET AND PROPRIETARY INFORMATION WHICH IS */
7 /* THE PROPERTY OF MENTOR GRAPHICS CORPORATION OR ITS LICENSORS AND IS */
8 /* SUBJECT TO LICENSE TERMS. */
9 /* */
10 /*************************************************************************/
11
12 /*************************************************************************/
13 /* */
14 /* FILE NAME VERSION */
15 /* */
16 /* csc.c Nucleus PLUS 1.14 */
17 /* */
18 /* COMPONENT */
19 /* */
20 /* CS - Common Services */
21 /* */
22 /* DESCRIPTION */
23 /* */
24 /* This file contains linked list manipulation facilities used */
25 /* throughout the Nucleus PLUS system. These facilities operate */
26 /* on doubly-linked circular lists. */
27 /* */
28 /* DATA STRUCTURES */
29 /* */
30 /* None */
31 /* */
32 /* FUNCTIONS */
33 /* */
34 /* CSC_Place_On_List Place node at the end of a */
35 /* list */
36 /* CSC_Priority_Place_On_List Place node in priority order */
37 /* on a list */
38 /* CSC_Remove_From_List Remove a node from a list */
39 /* */
40 /* DEPENDENCIES */
41 /* */
42 /* nucleus.h Nucleus PLUS constants */
43 /* cs_defs.h Common service definitions */
44 /* */
45 /* HISTORY */
46 /* */
47 /* DATE REMARKS */
48 /* */
49 /* 03-01-1993 Created initial version 1.0 */
50 /* 04-19-1993 Verified version 1.0 */
51 /* 03-01-1994 Changed void to VOID, removed */
52 /* clearing link pointers during */
53 /* removal of a node from a list, */
54 /* resulting in version 1.1 */
55 /* */
56 /* 03-18-1994 Verified version 1.1 */
57 /* 04-17-1996 updated to version 1.2 */
58 /* 03-24-1998 Released version 1.3. */
59 /* 03-26-1999 Released 1.11m (new release */
60 /* numbering scheme) */
61 /* 04-17-2002 Released version 1.13m */
62 /* 11-07-2002 Released version 1.14 */
63 /*************************************************************************/
64 #define NU_SOURCE_FILE
65
66
67 #include "cs_defs.h" /* Include CS definitions */
68 #include "cs_extr.h" /* Common service functions */
69
70
71 /*************************************************************************/
72 /* */
73 /* FUNCTION */
74 /* */
75 /* CSC_Place_On_List */
76 /* */
77 /* DESCRIPTION */
78 /* */
79 /* This function places the specified node at the end of specified */
80 /* linked list. */
81 /* */
82 /* CALLED BY */
83 /* */
84 /* various components */
85 /* */
86 /* CALLS */
87 /* */
88 /* None */
89 /* */
90 /* INPUTS */
91 /* */
92 /* head Pointer to head pointer */
93 /* node Pointer to node to add */
94 /* */
95 /* OUTPUTS */
96 /* */
97 /* modified list */
98 /* */
99 /* HISTORY */
100 /* */
101 /* NAME DATE REMARKS */
102 /* */
103 /* W. Lamie 03-01-1993 Created initial version 1.0 */
104 /* D. Lamie 04-19-1993 Verified version 1.0 */
105 /* */
106 /*************************************************************************/
107
108 #ifndef NU_INLINE
109
110 VOID CSC_Place_On_List(CS_NODE **head, CS_NODE *new_node)
111 {
112 NU_SUPERV_USER_VARIABLES
113
114 /* Switch to supervisor mode */
115 NU_SUPERVISOR_MODE();
116
117 /* Determine if the list in non-empty. */
118 if (*head)
119 {
120
121 /* The list is not empty. Add the new node to the end of
122 the list. */
123 new_node -> cs_previous = (*head) -> cs_previous;
124 (new_node -> cs_previous) -> cs_next = new_node;
125 new_node -> cs_next = (*head);
126 (new_node -> cs_next) -> cs_previous = new_node;
127 }
128 else
129 {
130
131 /* The list is empty, setup the head and the new node. */
132 (*head) = new_node;
133 new_node -> cs_previous = new_node;
134 new_node -> cs_next = new_node;
135 }
136
137 /* Return to user mode */
138 NU_USER_MODE();
139 }
140
141 #endif
142
143 /*************************************************************************/
144 /* */
145 /* FUNCTION */
146 /* */
147 /* CSC_Priority_Place_On_List */
148 /* */
149 /* DESCRIPTION */
150 /* */
151 /* This function places the specified node after all other nodes on */
152 /* the list of equal or greater priority. Note that lower */
153 /* numerical values indicate greater priority. */
154 /* */
155 /* CALLED BY */
156 /* */
157 /* various components */
158 /* */
159 /* CALLS */
160 /* */
161 /* None */
162 /* */
163 /* INPUTS */
164 /* */
165 /* head Pointer to head pointer */
166 /* node Pointer to node to add */
167 /* */
168 /* OUTPUTS */
169 /* */
170 /* modified list */
171 /* */
172 /* HISTORY */
173 /* */
174 /* NAME DATE REMARKS */
175 /* */
176 /* W. Lamie 03-01-1993 Created initial version 1.0 */
177 /* D. Lamie 04-19-1993 Verified version 1.0 */
178 /* */
179 /*************************************************************************/
180
181 VOID CSC_Priority_Place_On_List(CS_NODE **head, CS_NODE *new_node)
182 {
183
184 CS_NODE *search_ptr; /* List search pointer */
185 NU_SUPERV_USER_VARIABLES
186
187 /* Switch to supervisor mode */
188 NU_SUPERVISOR_MODE();
189
190 /* Determine if the list in non-empty. */
191 if (*head)
192 {
193
194 /* Search the list to find the proper place for the new node. */
195 search_ptr = (*head);
196
197 /* Check for insertion before the first node on the list. */
198 if (search_ptr -> cs_priority > new_node -> cs_priority)
199 {
200
201 /* Update the head pointer to point at the new node. */
202 (*head) = new_node;
203 }
204 else
205 {
206
207 /* We know that the new node is not the highest priority and
208 must be placed somewhere after the head pointer. */
209
210 /* Move search pointer up to the next node since we are trying
211 to find the proper node to insert in front of. */
212 search_ptr = search_ptr -> cs_next;
213 while ((search_ptr -> cs_priority <= new_node -> cs_priority) &&
214 (search_ptr != (*head)))
215 {
216
217 /* Move along to the next node. */
218 search_ptr = search_ptr -> cs_next;
219 }
220 }
221
222 /* Insert before search pointer. */
223 new_node -> cs_previous = search_ptr -> cs_previous;
224 (new_node -> cs_previous) -> cs_next = new_node;
225 new_node -> cs_next = search_ptr;
226 (new_node -> cs_next) -> cs_previous = new_node;
227 }
228 else
229 {
230
231 /* The list is empty, setup the head and the new node. */
232 (*head) = new_node;
233 new_node -> cs_previous = new_node;
234 new_node -> cs_next = new_node;
235 }
236
237 /* Return to user mode */
238 NU_USER_MODE();
239 }
240
241 /*************************************************************************/
242 /* */
243 /* FUNCTION */
244 /* */
245 /* CSC_Remove_From_List */
246 /* */
247 /* DESCRIPTION */
248 /* */
249 /* This function removes the specified node from the specified */
250 /* linked list. */
251 /* */
252 /* CALLED BY */
253 /* */
254 /* various components */
255 /* */
256 /* CALLS */
257 /* */
258 /* None */
259 /* */
260 /* INPUTS */
261 /* */
262 /* head Pointer to head pointer */
263 /* node Pointer to node to add */
264 /* */
265 /* OUTPUTS */
266 /* */
267 /* modified list */
268 /* */
269 /* HISTORY */
270 /* */
271 /* NAME DATE REMARKS */
272 /* */
273 /* W. Lamie 03-01-1993 Created initial version 1.0 */
274 /* D. Lamie 04-19-1993 Verified version 1.0 */
275 /* W. Lamie 03-01-1994 Removed clearing link pointers */
276 /* during removal of a node from */
277 /* list, resulting in version 1.1 */
278 /* R. Pfaff - */
279 /* D. Lamie 03-18-1994 Verified version 1.1 */
280 /* */
281 /*************************************************************************/
282
283 #ifndef NU_INLINE
284
285 VOID CSC_Remove_From_List(CS_NODE **head, CS_NODE *node)
286 {
287 NU_SUPERV_USER_VARIABLES
288
289 /* Switch to supervisor mode */
290 NU_SUPERVISOR_MODE();
291
292 /* Determine if this is the only node in the system. */
293 if (node -> cs_previous == node)
294 {
295
296 /* Yes, this is the only node in the system. Clear the node's
297 pointers and the head pointer. */
298 (*head) = NU_NULL;
299 }
300 else
301 {
302
303 /* Unlink the node from a multiple node list. */
304 (node -> cs_previous) -> cs_next = node -> cs_next;
305 (node -> cs_next) -> cs_previous = node -> cs_previous;
306
307 /* Check to see if the node to delete is at the head of the
308 list. */
309 if (node == *head)
310
311 /* Move the head pointer to the node after. */
312 *head = node -> cs_next;
313 }
314
315 /* Return to user mode */
316 NU_USER_MODE();
317 }
318
319 #endif
320
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