📄 os_sem.lst
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110 }
111 OS_EXIT_CRITICAL();
\ ??OSSemCreate_1:
\ 00000020 ........ _BLF OS_CPU_SR_Restore,??OS_CPU_SR_Restore??rT
112 if (pevent != (OS_EVENT *)0) { /* Get an event control block */
\ 00000024 002C CMP R4,#+0
\ 00000026 0AD0 BEQ.N ??OSSemCreate_2
113 pevent->OSEventType = OS_EVENT_TYPE_SEM;
\ 00000028 0320 MOVS R0,#+3
\ 0000002A 2070 STRB R0,[R4, #+0]
114 pevent->OSEventCnt = cnt; /* Set semaphore value */
\ 0000002C 2581 STRH R5,[R4, #+8]
115 pevent->OSEventPtr = (void *)0; /* Unlink from ECB free list */
\ 0000002E 0020 MOVS R0,#+0
\ 00000030 6060 STR R0,[R4, #+4]
116 #if OS_EVENT_NAME_SIZE > 1
117 pevent->OSEventName[0] = '?'; /* Unknown name */
\ 00000032 3F21 MOVS R1,#+63
\ 00000034 E173 STRB R1,[R4, #+15]
118 pevent->OSEventName[1] = OS_ASCII_NUL;
\ 00000036 2074 STRB R0,[R4, #+16]
119 #endif
120 OS_EventWaitListInit(pevent); /* Initialize to 'nobody waiting' on sem. */
\ 00000038 2000 MOVS R0,R4
\ 0000003A ........ _BLF OS_EventWaitListInit,??OS_EventWaitListInit??rT
121 }
122 return (pevent);
\ ??OSSemCreate_2:
\ 0000003E 2000 MOVS R0,R4
\ 00000040 30BD POP {R4,R5,PC} ;; return
123 }
124
125 /*$PAGE*/
126 /*
127 *********************************************************************************************************
128 * DELETE A SEMAPHORE
129 *
130 * Description: This function deletes a semaphore and readies all tasks pending on the semaphore.
131 *
132 * Arguments : pevent is a pointer to the event control block associated with the desired
133 * semaphore.
134 *
135 * opt determines delete options as follows:
136 * opt == OS_DEL_NO_PEND Delete semaphore ONLY if no task pending
137 * opt == OS_DEL_ALWAYS Deletes the semaphore even if tasks are waiting.
138 * In this case, all the tasks pending will be readied.
139 *
140 * perr is a pointer to an error code that can contain one of the following values:
141 * OS_ERR_NONE The call was successful and the semaphore was deleted
142 * OS_ERR_DEL_ISR If you attempted to delete the semaphore from an ISR
143 * OS_ERR_INVALID_OPT An invalid option was specified
144 * OS_ERR_TASK_WAITING One or more tasks were waiting on the semaphore
145 * OS_ERR_EVENT_TYPE If you didn't pass a pointer to a semaphore
146 * OS_ERR_PEVENT_NULL If 'pevent' is a NULL pointer.
147 *
148 * Returns : pevent upon error
149 * (OS_EVENT *)0 if the semaphore was successfully deleted.
150 *
151 * Note(s) : 1) This function must be used with care. Tasks that would normally expect the presence of
152 * the semaphore MUST check the return code of OSSemPend().
153 * 2) OSSemAccept() callers will not know that the intended semaphore has been deleted unless
154 * they check 'pevent' to see that it's a NULL pointer.
155 * 3) This call can potentially disable interrupts for a long time. The interrupt disable
156 * time is directly proportional to the number of tasks waiting on the semaphore.
157 * 4) Because ALL tasks pending on the semaphore will be readied, you MUST be careful in
158 * applications where the semaphore is used for mutual exclusion because the resource(s)
159 * will no longer be guarded by the semaphore.
160 *********************************************************************************************************
161 */
162
163 #if OS_SEM_DEL_EN > 0
\ In segment CODE, align 4, keep-with-next
164 OS_EVENT *OSSemDel (OS_EVENT *pevent, INT8U opt, INT8U *perr)
165 {
\ OSSemDel:
\ 00000000 2DE9F04F PUSH {R4-R11,LR}
\ 00000004 8846 MOV R8,R1
\ 00000006 0400 MOVS R4,R0
\ 00000008 1500 MOVS R5,R2
166 BOOLEAN tasks_waiting;
167 OS_EVENT *pevent_return;
168 #if OS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */
169 OS_CPU_SR cpu_sr = 0;
170 #endif
171
172
173
174 #if OS_ARG_CHK_EN > 0
175 if (perr == (INT8U *)0) { /* Validate 'perr' */
176 return (pevent);
177 }
178 if (pevent == (OS_EVENT *)0) { /* Validate 'pevent' */
179 *perr = OS_ERR_PEVENT_NULL;
180 return (pevent);
181 }
182 #endif
183 if (pevent->OSEventType != OS_EVENT_TYPE_SEM) { /* Validate event block type */
\ 0000000A 0127 MOVS R7,#+1
\ 0000000C 2078 LDRB R0,[R4, #+0]
\ 0000000E 0328 CMP R0,#+3
\ 00000010 02D0 BEQ.N ??OSSemDel_0
184 *perr = OS_ERR_EVENT_TYPE;
\ 00000012 2F70 STRB R7,[R5, #+0]
185 return (pevent);
\ 00000014 2000 MOVS R0,R4
\ 00000016 51E0 B.N ??OSSemDel_1
186 }
187 if (OSIntNesting > 0) { /* See if called from ISR ... */
\ ??OSSemDel_0:
\ 00000018 .... LDR.N R0,??DataTable4 ;; OSIntNesting
\ 0000001A 0078 LDRB R0,[R0, #+0]
\ 0000001C 0028 CMP R0,#+0
\ 0000001E 03D0 BEQ.N ??OSSemDel_2
188 *perr = OS_ERR_DEL_ISR; /* ... can't DELETE from an ISR */
\ 00000020 0F20 MOVS R0,#+15
\ 00000022 2870 STRB R0,[R5, #+0]
189 return (pevent);
\ 00000024 2000 MOVS R0,R4
\ 00000026 49E0 B.N ??OSSemDel_1
190 }
191 OS_ENTER_CRITICAL();
\ ??OSSemDel_2:
\ 00000028 ........ _BLF OS_CPU_SR_Save,??OS_CPU_SR_Save??rT
\ 0000002C 8146 MOV R9,R0
192 if (pevent->OSEventGrp != 0) { /* See if any tasks waiting on semaphore */
\ 0000002E 0020 MOVS R0,#+0
\ 00000030 8246 MOV R10,R0
\ 00000032 A07A LDRB R0,[R4, #+10]
\ 00000034 0028 CMP R0,#+0
\ 00000036 00D1 BNE.N ??OSSemDel_3
193 tasks_waiting = OS_TRUE; /* Yes */
194 } else {
195 tasks_waiting = OS_FALSE; /* No */
\ 00000038 5746 MOV R7,R10
196 }
197 switch (opt) {
\ ??OSSemDel_3:
\ 0000003A .... LDR.N R6,??DataTable3 ;; OSEventFreeList
\ 0000003C 3F20 MOVS R0,#+63
\ 0000003E 8346 MOV R11,R0
\ 00000040 4046 MOV R0,R8
\ 00000042 0028 CMP R0,#+0
\ 00000044 02D0 BEQ.N ??OSSemDel_4
\ 00000046 0128 CMP R0,#+1
\ 00000048 1CD0 BEQ.N ??OSSemDel_5
\ 0000004A 31E0 B.N ??OSSemDel_6
198 case OS_DEL_NO_PEND: /* Delete semaphore only if no task waiting */
199 if (tasks_waiting == OS_FALSE) {
\ ??OSSemDel_4:
\ 0000004C 002F CMP R7,#+0
\ 0000004E 0CD1 BNE.N ??OSSemDel_7
200 #if OS_EVENT_NAME_SIZE > 1
201 pevent->OSEventName[0] = '?'; /* Unknown name */
\ 00000050 84F80FB0 STRB R11,[R4, #+15]
202 pevent->OSEventName[1] = OS_ASCII_NUL;
\ 00000054 2074 STRB R0,[R4, #+16]
203 #endif
204 pevent->OSEventType = OS_EVENT_TYPE_UNUSED;
\ 00000056 2070 STRB R0,[R4, #+0]
205 pevent->OSEventPtr = OSEventFreeList; /* Return Event Control Block to free list */
\ 00000058 3068 LDR R0,[R6, #+0]
\ 0000005A 6060 STR R0,[R4, #+4]
206 pevent->OSEventCnt = 0;
\ 0000005C 5046 MOV R0,R10
\ 0000005E 2081 STRH R0,[R4, #+8]
207 OSEventFreeList = pevent; /* Get next free event control block */
\ 00000060 3460 STR R4,[R6, #+0]
208 OS_EXIT_CRITICAL();
\ 00000062 4846 MOV R0,R9
\ 00000064 ........ _BLF OS_CPU_SR_Restore,??OS_CPU_SR_Restore??rT
\ 00000068 1FE0 B.N ??OSSemDel_8
209 *perr = OS_ERR_NONE;
210 pevent_return = (OS_EVENT *)0; /* Semaphore has been deleted */
211 } else {
212 OS_EXIT_CRITICAL();
\ ??OSSemDel_7:
\ 0000006A 4846 MOV R0,R9
\ 0000006C ........ _BLF OS_CPU_SR_Restore,??OS_CPU_SR_Restore??rT
213 *perr = OS_ERR_TASK_WAITING;
\ 00000070 4920 MOVS R0,#+73
\ 00000072 2870 STRB R0,[R5, #+0]
214 pevent_return = pevent;
\ 00000074 2000 MOVS R0,R4
\ 00000076 21E0 B.N ??OSSemDel_1
215 }
216 break;
217
218 case OS_DEL_ALWAYS: /* Always delete the semaphore */
219 while (pevent->OSEventGrp != 0) { /* Ready ALL tasks waiting for semaphore */
220 (void)OS_EventTaskRdy(pevent, (void *)0, OS_STAT_SEM, OS_STAT_PEND_OK);
\ ??OSSemDel_9:
\ 00000078 5346 MOV R3,R10
\ 0000007A 0122 MOVS R2,#+1
\ 0000007C 1946 MOV R1,R3
\ 0000007E 2000 MOVS R0,R4
\ 00000080 ........ _BLF OS_EventTaskRdy,??OS_EventTaskRdy??rT
221 }
\ ??OSSemDel_5:
\ 00000084 A07A LDRB R0,[R4, #+10]
\ 00000086 0028 CMP R0,#+0
\ 00000088 F6D1 BNE.N ??OSSemDel_9
222 #if OS_EVENT_NAME_SIZE > 1
223 pevent->OSEventName[0] = '?'; /* Unknown name */
\ 0000008A 84F80FB0 STRB R11,[R4, #+15]
224 pevent->OSEventName[1] = OS_ASCII_NUL;
\ 0000008E 2074 STRB R0,[R4, #+16]
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