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comparison src/nucleus/mbf.c @ 0:92470e5d0b9e

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src: partial import from FC Selenite
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 15 May 2020 01:28:16 +0000
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-1:000000000000 0:92470e5d0b9e
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 /* mbf.c Nucleus PLUS 1.14 */
17 /* */
18 /* COMPONENT */
19 /* */
20 /* MB - Mailbox Management */
21 /* */
22 /* DESCRIPTION */
23 /* */
24 /* This file contains routines to obtain facts about the Mailbox */
25 /* management component. */
26 /* */
27 /* DATA STRUCTURES */
28 /* */
29 /* None */
30 /* */
31 /* FUNCTIONS */
32 /* */
33 /* MBF_Established_Mailboxes Number of created mailboxes */
34 /* MBF_Mailbox_Pointers Build mailbox pointer list */
35 /* MBF_Mailbox_Information Retrieve mailbox information */
36 /* */
37 /* DEPENDENCIES */
38 /* */
39 /* cs_extr.h Common Service functions */
40 /* tc_extr.h Thread Control functions */
41 /* mb_extr.h Mailbox functions */
42 /* hi_extr.h History functions */
43 /* */
44 /* HISTORY */
45 /* */
46 /* DATE REMARKS */
47 /* */
48 /* 03-01-1994 Initial version of mailbox fact */
49 /* service file, version 1.1 */
50 /* */
51 /* 03-18-1994 Verified version 1.1 */
52 /* 04-17-1996 updated to version 1.2 */
53 /* 11-18-1996 Protected Informational service */
54 /* from NULL Control Block pointers */
55 /* creating 1.2a. (SPR220) */
56 /* 03-24-1998 Released version 1.3 */
57 /* 03-26-1999 Released 1.11m (new release */
58 /* numbering scheme) */
59 /* 04-17-2002 Released version 1.13m */
60 /* 11-07-2002 Released version 1.14 */
61 /*************************************************************************/
62 #define NU_SOURCE_FILE
63
64
65 #include "cs_extr.h" /* Common service functions */
66 #include "tc_extr.h" /* Thread control functions */
67 #include "mb_extr.h" /* Mailbox functions */
68 #include "hi_extr.h" /* History functions */
69
70
71 /* Define external inner-component global data references. */
72
73 extern CS_NODE *MBD_Created_Mailboxes_List;
74 extern UNSIGNED MBD_Total_Mailboxes;
75 extern TC_PROTECT MBD_List_Protect;
76
77
78 /* Define internal component function prototypes. */
79
80 VOID MBC_Cleanup(VOID *information);
81
82
83 /*************************************************************************/
84 /* */
85 /* FUNCTION */
86 /* */
87 /* MBF_Established_Mailboxes */
88 /* */
89 /* DESCRIPTION */
90 /* */
91 /* This function returns the current number of established */
92 /* mailboxes. Mailboxes previously deleted are no longer */
93 /* considered established. */
94 /* */
95 /* CALLED BY */
96 /* */
97 /* Application */
98 /* */
99 /* CALLS */
100 /* */
101 /* [TCT_Check_Stack] Stack checking function */
102 /* */
103 /* INPUTS */
104 /* */
105 /* None */
106 /* */
107 /* OUTPUTS */
108 /* */
109 /* MBD_Total_Mailboxes Number of established */
110 /* mailboxes */
111 /* */
112 /* HISTORY */
113 /* */
114 /* DATE REMARKS */
115 /* */
116 /* 03-01-1993 Created initial version 1.0 */
117 /* 04-19-1993 Verified version 1.0 */
118 /* */
119 /*************************************************************************/
120 UNSIGNED MBF_Established_Mailboxes(VOID)
121 {
122
123
124 #ifdef NU_ENABLE_STACK_CHECK
125
126 /* Call stack checking function to check for an overflow condition. */
127 TCT_Check_Stack();
128
129 #endif
130
131 /* Return the number of established mailboxes. */
132 return(MBD_Total_Mailboxes);
133 }
134
135
136 /*************************************************************************/
137 /* */
138 /* FUNCTION */
139 /* */
140 /* MBF_Mailbox_Pointers */
141 /* */
142 /* DESCRIPTION */
143 /* */
144 /* This function builds a list of mailbox pointers, starting at the */
145 /* specified location. The number of mailbox pointers placed in */
146 /* the list is equivalent to the total number of mailboxes or the */
147 /* maximum number of pointers specified in the call. */
148 /* */
149 /* CALLED BY */
150 /* */
151 /* Application */
152 /* */
153 /* CALLS */
154 /* */
155 /* [TCT_Check_Stack] Stack checking function */
156 /* TCT_Protect Protect created list */
157 /* TCT_Unprotect Release protection */
158 /* */
159 /* INPUTS */
160 /* */
161 /* pointer_list Pointer to the list area */
162 /* maximum_pointers Maximum number of pointers */
163 /* */
164 /* OUTPUTS */
165 /* */
166 /* pointers Number of mailboxes placed */
167 /* in the list */
168 /* HISTORY */
169 /* */
170 /* DATE REMARKS */
171 /* */
172 /* 03-01-1993 Created initial version 1.0 */
173 /* 04-19-1993 Verified version 1.0 */
174 /* 08-09-1993 Corrected pointer retrieval */
175 /* loop, resulting in version 1.0a */
176 /* 08-09-1993 Verified version 1.0a */
177 /* 03-01-1994 Changed function interface to */
178 /* match the prototype, */
179 /* resulting in version 1.1 */
180 /* */
181 /* 03-18-1994 Verified version 1.1 */
182 /* */
183 /*************************************************************************/
184 UNSIGNED MBF_Mailbox_Pointers(NU_MAILBOX **pointer_list,
185 UNSIGNED maximum_pointers)
186 {
187 CS_NODE *node_ptr; /* Pointer to each MCB */
188 UNSIGNED pointers; /* Number of pointers in list*/
189 NU_SUPERV_USER_VARIABLES
190
191 /* Switch to supervisor mode */
192 NU_SUPERVISOR_MODE();
193
194 #ifdef NU_ENABLE_STACK_CHECK
195
196 /* Call stack checking function to check for an overflow condition. */
197 TCT_Check_Stack();
198
199 #endif
200
201 /* Initialize the number of pointers returned. */
202 pointers = 0;
203
204 /* Protect against access to the list of created mailboxes. */
205 TCT_Protect(&MBD_List_Protect);
206
207 /* Loop until all mailbox pointers are in the list or until the maximum
208 list size is reached. */
209 node_ptr = MBD_Created_Mailboxes_List;
210 while ((node_ptr) && (pointers < maximum_pointers))
211 {
212
213 /* Place the node into the destination list. */
214 *pointer_list++ = (NU_MAILBOX *) node_ptr;
215
216 /* Increment the pointers variable. */
217 pointers++;
218
219 /* Position the node pointer to the next node. */
220 node_ptr = node_ptr -> cs_next;
221
222 /* Determine if the pointer is at the head of the list. */
223 if (node_ptr == MBD_Created_Mailboxes_List)
224
225 /* The list search is complete. */
226 node_ptr = NU_NULL;
227 }
228
229 /* Release protection against access to the list of created mailboxes. */
230 TCT_Unprotect();
231
232 /* Return to user mode */
233 NU_USER_MODE();
234
235 /* Return the number of pointers in the list. */
236 return(pointers);
237 }
238
239
240 /*************************************************************************/
241 /* */
242 /* FUNCTION */
243 /* */
244 /* MBF_Mailbox_Information */
245 /* */
246 /* DESCRIPTION */
247 /* */
248 /* This function returns information about the specified mailbox. */
249 /* However, if the supplied mailbox pointer is invalid, the */
250 /* function simply returns an error status. */
251 /* */
252 /* CALLED BY */
253 /* */
254 /* Application */
255 /* */
256 /* CALLS */
257 /* */
258 /* [TCT_Check_Stack] Stack checking function */
259 /* TCT_System_Protect Protect mailbox */
260 /* TCT_Unprotect Release protection */
261 /* */
262 /* INPUTS */
263 /* */
264 /* mailbox_ptr Pointer to the mailbox */
265 /* name Destination for the name */
266 /* suspend_type Destination for the type of */
267 /* suspension */
268 /* message_present Destination for the message */
269 /* present flag */
270 /* tasks_waiting Destination for the tasks */
271 /* waiting count */
272 /* first_task Destination for the pointer */
273 /* to the first task waiting */
274 /* */
275 /* OUTPUTS */
276 /* */
277 /* NU_SUCCESS If a valid mailbox pointer */
278 /* is supplied */
279 /* NU_INVALID_MAILBOX If mailbox pointer invalid */
280 /* */
281 /* HISTORY */
282 /* */
283 /* DATE REMARKS */
284 /* */
285 /* 03-01-1993 Created initial version 1.0 */
286 /* 04-19-1993 Verified version 1.0 */
287 /* 03-01-1994 Changed function interface to */
288 /* match the prototype, */
289 /* resulting in version 1.1 */
290 /* */
291 /* 03-18-1994 Verified version 1.1 */
292 /* 11-18-1996 Corrected SPR220. */
293 /* */
294 /*************************************************************************/
295 STATUS MBF_Mailbox_Information(NU_MAILBOX *mailbox_ptr, CHAR *name,
296 OPTION *suspend_type, DATA_ELEMENT *message_present,
297 UNSIGNED *tasks_waiting, NU_TASK **first_task)
298 {
299
300 MB_MCB *mailbox; /* Mailbox control block ptr */
301 int i; /* Working integer variable */
302 STATUS completion; /* Completion status */
303 NU_SUPERV_USER_VARIABLES
304
305 /* Switch to supervisor mode */
306 NU_SUPERVISOR_MODE();
307
308 /* Move input mailbox pointer into internal pointer. */
309 mailbox = (MB_MCB *) mailbox_ptr;
310
311
312 #ifdef NU_ENABLE_STACK_CHECK
313
314 /* Call stack checking function to check for an overflow condition. */
315 TCT_Check_Stack();
316
317 #endif
318
319 /* Determine if this mailbox id is valid. */
320 if ((mailbox != NU_NULL) && (mailbox -> mb_id == MB_MAILBOX_ID))
321 {
322
323 /* Setup protection of the mailbox. */
324 TCT_System_Protect();
325
326 /* The mailbox pointer is valid. Reflect this in the completion
327 status and fill in the actual information. */
328 completion = NU_SUCCESS;
329
330 /* Copy the mailbox's name. */
331 for (i = 0; i < NU_MAX_NAME; i++)
332 *name++ = mailbox -> mb_name[i];
333
334 /* Determine the suspension type. */
335 if (mailbox -> mb_fifo_suspend)
336 *suspend_type = NU_FIFO;
337 else
338 *suspend_type = NU_PRIORITY;
339
340 /* Indicate whether or not there is a message in the mailbox. */
341 *message_present = mailbox -> mb_message_present;
342
343 /* Retrieve the number of tasks waiting and the pointer to the
344 first task waiting. */
345 *tasks_waiting = mailbox -> mb_tasks_waiting;
346 if (mailbox -> mb_suspension_list)
347
348 /* There is a task waiting. */
349 *first_task = (NU_TASK *)
350 (mailbox -> mb_suspension_list) -> mb_suspended_task;
351 else
352
353 /* There are no tasks waiting. */
354 *first_task = NU_NULL;
355
356 /* Release protection. */
357 TCT_Unprotect();
358 }
359 else
360
361 /* Indicate that the mailbox pointer is invalid. */
362 completion = NU_INVALID_MAILBOX;
363
364 /* Return to user mode */
365 NU_USER_MODE();
366
367 /* Return the appropriate completion status. */
368 return(completion);
369 }
370
371
372
373
374