?? os_mbox.lst
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127 2 return ((void *)0);
128 2 }
129 1 msg = pevent->OSEventPtr;
130 1 if (msg != (void *)0) { /* See if there is already a message */
131 2 pevent->OSEventPtr = (void *)0; /* Clear the mailbox */
132 2 OS_EXIT_CRITICAL();
133 2 *err = OS_NO_ERR;
134 2 } else if (OSIntNesting > 0) { /* See if called from ISR ... */
135 2 OS_EXIT_CRITICAL(); /* ... can't PEND from an ISR */
136 2 *err = OS_ERR_PEND_ISR;
137 2 } else {
138 2 OSTCBCur->OSTCBStat |= OS_STAT_MBOX; /* Message not available, task will pend */
139 2 OSTCBCur->OSTCBDly = timeout; /* Load timeout in TCB */
140 2 OSEventTaskWait(pevent); /* Suspend task until event or timeout occurs */
141 2 OS_EXIT_CRITICAL();
142 2 OSSched(); /* Find next highest priority task ready to run */
143 2 OS_ENTER_CRITICAL();
144 2 if ((msg = OSTCBCur->OSTCBMsg) != (void *)0) { /* See if we were given the message */
145 3 OSTCBCur->OSTCBMsg = (void *)0; /* Yes, clear message received */
146 3 OSTCBCur->OSTCBStat = OS_STAT_RDY;
147 3 OSTCBCur->OSTCBEventPtr = (OS_EVENT *)0; /* No longer waiting for event */
148 3 OS_EXIT_CRITICAL();
149 3 *err = OS_NO_ERR;
150 3 } else if (OSTCBCur->OSTCBStat & OS_STAT_MBOX) { /* If status is not OS_STAT_RDY, timed out */
151 3 OSEventTO(pevent); /* Make task ready */
152 3 OS_EXIT_CRITICAL();
153 3 msg = (void *)0; /* Set message contents to NULL */
154 3 *err = OS_TIMEOUT; /* Indicate that a timeout occured */
155 3 } else {
156 3 msg = pevent->OSEventPtr; /* Message received */
157 3 pevent->OSEventPtr = (void *)0; /* Clear the mailbox */
158 3 OSTCBCur->OSTCBEventPtr = (OS_EVENT *)0;
159 3 OS_EXIT_CRITICAL();
160 3 *err = OS_NO_ERR;
161 3 }
162 2 }
163 1 return (msg); /* Return the message received (or NULL) */
164 1 }
165 /*$PAGE*/
166 /*
167 *********************************************************************************************************
168 * POST MESSAGE TO A MAILBOX
169 *
170 * Description: This function sends a message to a mailbox
171 *
172 * Arguments : pevent is a pointer to the event control block associated with the desired mailbox
173 *
174 * msg is a pointer to the message to send. You MUST NOT send a NULL pointer.
175 *
176 * Returns : OS_NO_ERR The call was successful and the message was sent
177 * OS_MBOX_FULL If the mailbox already contains a message. You can can only send one
178 * message at a time and thus, the message MUST be consumed before you are
C51 COMPILER V6.12 OS_MBOX 04/12/2004 19:13:37 PAGE 4
179 * allowed to send another one.
180 * OS_ERR_EVENT_TYPE If you are attempting to post to a non mailbox.
181 *********************************************************************************************************
182 */
183
184 INT8U OSMboxPost (OS_EVENT *pevent, void *msg) reentrant
185 {
186 1 OS_ENTER_CRITICAL();
187 1 if (pevent->OSEventType != OS_EVENT_TYPE_MBOX) { /* Validate event block type */
188 2 OS_EXIT_CRITICAL();
189 2 return (OS_ERR_EVENT_TYPE);
190 2 }
191 1 if (pevent->OSEventGrp) { /* See if any task pending on mailbox */
192 2 OSEventTaskRdy(pevent, msg, OS_STAT_MBOX); /* Ready highest priority task waiting on event */
193 2 OS_EXIT_CRITICAL();
194 2 OSSched(); /* Find highest priority task ready to run */
195 2 return (OS_NO_ERR);
196 2 } else {
197 2 if (pevent->OSEventPtr != (void *)0) { /* Make sure mailbox doesn't already have a msg */
198 3 OS_EXIT_CRITICAL();
199 3 return (OS_MBOX_FULL);
200 3 } else {
201 3 pevent->OSEventPtr = msg; /* Place message in mailbox */
202 3 OS_EXIT_CRITICAL();
203 3 return (OS_NO_ERR);
204 3 }
205 2 }
206 1 }
207 /*$PAGE*/
208 /*
209 *********************************************************************************************************
210 * QUERY A MESSAGE MAILBOX
211 *
212 * Description: This function obtains information about a message mailbox.
213 *
214 * Arguments : pevent is a pointer to the event control block associated with the desired mailbox
215 *
216 * pdata is a pointer to a structure that will contain information about the message
217 * mailbox.
218 *
219 * Returns : OS_NO_ERR The call was successful and the message was sent
220 * OS_ERR_EVENT_TYPE If you are attempting to obtain data from a non mailbox.
221 *********************************************************************************************************
222 */
223
224 INT8U OSMboxQuery (OS_EVENT *pevent, OS_MBOX_DATA *ppdata) reentrant
225 {
226 1 INT8U i;
227 1 INT8U *psrc;
228 1 INT8U *pdest;
229 1
230 1
231 1 OS_ENTER_CRITICAL();
232 1 if (pevent->OSEventType != OS_EVENT_TYPE_MBOX) { /* Validate event block type */
233 2 OS_EXIT_CRITICAL();
234 2 return (OS_ERR_EVENT_TYPE);
235 2 }
236 1 ppdata->OSEventGrp = pevent->OSEventGrp; /* Copy message mailbox wait list */
237 1 psrc = &pevent->OSEventTbl[0];
238 1 pdest = &ppdata->OSEventTbl[0];
239 1 for (i = 0; i < OS_EVENT_TBL_SIZE; i++) {
240 2 *pdest++ = *psrc++;
C51 COMPILER V6.12 OS_MBOX 04/12/2004 19:13:37 PAGE 5
241 2 }
242 1 ppdata->OSMsg = pevent->OSEventPtr; /* Get message from mailbox */
243 1 OS_EXIT_CRITICAL();
244 1 return (OS_NO_ERR);
245 1 }
246 #endif
MODULE INFORMATION: STATIC OVERLAYABLE
CODE SIZE = 1447 ----
CONSTANT SIZE = ---- ----
XDATA SIZE = ---- ----
PDATA SIZE = ---- ----
DATA SIZE = ---- ----
IDATA SIZE = ---- ----
BIT SIZE = ---- ----
END OF MODULE INFORMATION.
C51 COMPILATION COMPLETE. 0 WARNING(S), 0 ERROR(S)
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