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comparison src/nucleus/sms.c @ 0:4e78acac3d88

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src/{condat,cs,gpf,nucleus}: import from Selenite
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 16 Oct 2020 06:23:26 +0000
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-1:000000000000 0:4e78acac3d88
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 /* sms.c Nucleus PLUS 1.14 */
17 /* */
18 /* COMPONENT */
19 /* */
20 /* SM - Semaphore Management */
21 /* */
22 /* DESCRIPTION */
23 /* */
24 /* This file contains the supplemental routines for the Semaphore */
25 /* Management component. */
26 /* */
27 /* DATA STRUCTURES */
28 /* */
29 /* None */
30 /* */
31 /* FUNCTIONS */
32 /* */
33 /* SMS_Reset_Semaphore Reset semaphore */
34 /* terminate condition */
35 /* */
36 /* DEPENDENCIES */
37 /* */
38 /* cs_extr.h Common Service functions */
39 /* tc_extr.h Thread Control functions */
40 /* sm_extr.h Semaphore functions */
41 /* hi_extr.h History functions */
42 /* */
43 /* HISTORY */
44 /* */
45 /* DATE REMARKS */
46 /* */
47 /* 03-01-1994 Created initial version 1.1 from */
48 /* routines originally in core */
49 /* */
50 /* 03-18-1994 Verified version 1.1 */
51 /* 04-17-1996 updated to version 1.2 */
52 /* 03-24-1998 Released version 1.3. */
53 /* 03-26-1999 Released 1.11m (new release */
54 /* numbering scheme) */
55 /* 04-17-2002 Released version 1.13m */
56 /* 11-07-2002 Released version 1.14 */
57 /*************************************************************************/
58 #define NU_SOURCE_FILE
59
60
61 #include "cs_extr.h" /* Common service functions */
62 #include "tc_extr.h" /* Thread control functions */
63 #include "sm_extr.h" /* Semaphore functions */
64 #include "hi_extr.h" /* History functions */
65 #include "profiler.h" /* ProView interface */
66
67
68
69 /*************************************************************************/
70 /* */
71 /* FUNCTION */
72 /* */
73 /* SMS_Reset_Semaphore */
74 /* */
75 /* DESCRIPTION */
76 /* */
77 /* This function resets a semaphore back to the initial state. All */
78 /* tasks suspended on the semaphore are resumed with the reset */
79 /* completion status. */
80 /* */
81 /* CALLED BY */
82 /* */
83 /* Application */
84 /* SMSE_Reset_Semaphore Error checking shell */
85 /* */
86 /* CALLS */
87 /* */
88 /* [HIC_Make_History_Entry] Make entry in history log */
89 /* TCC_Resume_Task Resume a suspended task */
90 /* [TCT_Check_Stack] Stack checking function */
91 /* TCT_Control_To_System Transfer control to system */
92 /* TCT_System_Protect Protect semaphore */
93 /* TCT_Unprotect Release protection */
94 /* */
95 /* INPUTS */
96 /* */
97 /* semaphore_ptr Semaphore control block ptr */
98 /* initial_count Initial count to reset the */
99 /* semaphore to */
100 /* */
101 /* OUTPUTS */
102 /* */
103 /* NU_SUCCESS */
104 /* */
105 /* HISTORY */
106 /* */
107 /* DATE REMARKS */
108 /* */
109 /* 03-01-1993 Created initial version 1.0 */
110 /* 04-19-1993 Verified version 1.0 */
111 /* 03-01-1994 Changed function interface to */
112 /* match the prototype, added */
113 /* register variable logic, */
114 /* optimized protection logic, */
115 /* resulting in version 1.1 */
116 /* */
117 /* 03-18-1994 Verified version 1.1 */
118 /* */
119 /*************************************************************************/
120 STATUS SMS_Reset_Semaphore(NU_SEMAPHORE *semaphore_ptr,
121 UNSIGNED initial_count)
122 {
123
124 R1 SM_SCB *semaphore; /* Semaphore control blk ptr */
125 R2 SM_SUSPEND *suspend_ptr; /* Suspend block pointer */
126 R3 SM_SUSPEND *next_ptr; /* Next suspend block pointer*/
127 STATUS preempt; /* Status for resume call */
128 NU_SUPERV_USER_VARIABLES
129
130 /* Switch to supervisor mode */
131 NU_SUPERVISOR_MODE();
132
133 /* Move input semaphore pointer into internal pointer. */
134 semaphore = (SM_SCB *) semaphore_ptr;
135
136 #ifdef NU_ENABLE_STACK_CHECK
137
138 /* Call stack checking function to check for an overflow condition. */
139 TCT_Check_Stack();
140
141 #endif
142
143 #ifdef NU_ENABLE_HISTORY
144
145 /* Make an entry that corresponds to this function in the system history
146 log. */
147 HIC_Make_History_Entry(NU_RESET_SEMAPHORE_ID, (UNSIGNED) semaphore,
148 (UNSIGNED) initial_count, (UNSIGNED) 0);
149
150 #endif
151
152 /* Protect against access to the semaphore. */
153 TCT_System_Protect();
154
155 /* Pickup the suspended task pointer list. */
156 suspend_ptr = semaphore -> sm_suspension_list;
157
158 /* Walk the chain task(s) currently suspended on the semaphore. */
159 preempt = 0;
160 while (suspend_ptr)
161 {
162
163 /* Resume the suspended task. Insure that the status returned is
164 NU_SEMAPHORE_RESET. */
165 suspend_ptr -> sm_return_status = NU_SEMAPHORE_RESET;
166
167 /* Point to the next suspend structure in the link. */
168 next_ptr = (SM_SUSPEND *) (suspend_ptr -> sm_suspend_link.cs_next);
169
170 /* Resume the specified task. */
171 preempt = preempt |
172 TCC_Resume_Task((NU_TASK *) suspend_ptr -> sm_suspended_task,
173 NU_SEMAPHORE_SUSPEND);
174
175 /* Determine if the next is the same as the current pointer. */
176 if (next_ptr == semaphore -> sm_suspension_list)
177
178 /* Clear the suspension pointer to signal the end of the list
179 traversal. */
180 suspend_ptr = NU_NULL;
181 else
182
183 /* Move the next pointer into the suspend block pointer. */
184 suspend_ptr = next_ptr;
185 }
186
187 /* Initialize the semaphore. */
188 semaphore -> sm_semaphore_count = initial_count;
189 semaphore -> sm_tasks_waiting = 0;
190 semaphore -> sm_suspension_list = NU_NULL;
191
192 #ifdef INCLUDE_PROVIEW
193 _RTProf_DumpSema(RT_PROF_RESET_SEMAPHORE,(SM_SCB *) semaphore, RT_PROF_OK);
194 #endif
195
196 /* Determine if preemption needs to occur. */
197 if (preempt)
198
199 /* Transfer control to system to facilitate preemption. */
200 TCT_Control_To_System();
201
202 /* Release protection against access to the semaphore. */
203 TCT_Unprotect();
204
205 /* Return to user mode */
206 NU_USER_MODE();
207
208 /* Return a successful completion. */
209 return(NU_SUCCESS);
210 }
211
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