📄 os_sem.lst
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#endif
211
212 /*$PAGE*/
213 /*
214 *********************************************************************************************************
215 * PEND ON SEMAPHORE
216 *
217 * Description: This function waits for a semaphore.
218 *
219 * Arguments : pevent is a pointer to the event control block associated with the desired
220 * semaphore.
221 *
222 * timeout is an optional timeout period (in clock ticks). If non-zero, your task will
223 * wait for the resource up to the amount of time specified by this argument.
224 * If you specify 0, however, your task will wait forever at the specified
225 * semaphore or, until the resource becomes available (or the event occurs).
226 *
227 * err is a pointer to where an error message will be deposited. Possible error
228 * messages are:
229 *
230 * OS_NO_ERR The call was successful and your task owns the resource
231 * or, the event you are waiting for occurred.
232 * OS_TIMEOUT The semaphore was not received within the specified
233 * timeout.
234 * OS_ERR_EVENT_TYPE If you didn't pass a pointer to a semaphore.
235 * OS_ERR_PEND_ISR If you called this function from an ISR and the result
236 * would lead to a suspension.
237 * OS_ERR_PEVENT_NULL If 'pevent' is a NULL pointer.
238 *
239 * Returns : none
240 *********************************************************************************************************
C51 COMPILER V7.06 OS_SEM 03/05/2008 20:23:55 PAGE 5
241 */
242
243 void OSSemPend (OS_EVENT *pevent, INT16U timeout, INT8U *err) reentrant
244 {
245 1 #if OS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */
OS_CPU_SR cpu_sr;
#endif
248 1
249 1
250 1 if (OSIntNesting > 0) { /* See if called from ISR ... */
251 2 *err = OS_ERR_PEND_ISR; /* ... can't PEND from an ISR */
252 2 return;
253 2 }
254 1 #if OS_ARG_CHK_EN > 0
255 1 if (pevent == (OS_EVENT *)0) { /* Validate 'pevent' */
256 2 *err = OS_ERR_PEVENT_NULL;
257 2 return;
258 2 }
259 1 if (pevent->OSEventType != OS_EVENT_TYPE_SEM) { /* Validate event block type */
260 2 *err = OS_ERR_EVENT_TYPE;
261 2 return;
262 2 }
263 1 #endif
264 1 OS_ENTER_CRITICAL();
265 1 if (pevent->OSEventCnt > 0) { /* If sem. is positive, resource available ... */
266 2 pevent->OSEventCnt--; /* ... decrement semaphore only if positive. */
267 2 OS_EXIT_CRITICAL();
268 2 *err = OS_NO_ERR;
269 2 return;
270 2 }
271 1 /* Otherwise, must wait until event occurs */
272 1 OSTCBCur->OSTCBStat |= OS_STAT_SEM; /* Resource not available, pend on semaphore */
273 1 OSTCBCur->OSTCBDly = timeout; /* Store pend timeout in TCB */
274 1 OS_EventTaskWait(pevent); /* Suspend task until event or timeout occurs */
275 1 OS_EXIT_CRITICAL();
276 1 OS_Sched(); /* Find next highest priority task ready */
277 1 OS_ENTER_CRITICAL();
278 1 if (OSTCBCur->OSTCBStat & OS_STAT_SEM) { /* Must have timed out if still waiting for event*/
279 2 OS_EventTO(pevent);
280 2 OS_EXIT_CRITICAL();
281 2 *err = OS_TIMEOUT; /* Indicate that didn't get event within TO */
282 2 return;
283 2 }
284 1 OSTCBCur->OSTCBEventPtr = (OS_EVENT *)0;
285 1 OS_EXIT_CRITICAL();
286 1 *err = OS_NO_ERR;
287 1 }
288 /*$PAGE*/
289 /*
290 *********************************************************************************************************
291 * POST TO A SEMAPHORE
292 *
293 * Description: This function signals a semaphore
294 *
295 * Arguments : pevent is a pointer to the event control block associated with the desired
296 * semaphore.
297 *
298 * Returns : OS_NO_ERR The call was successful and the semaphore was signaled.
299 * OS_SEM_OVF If the semaphore count exceeded its limit. In other words, you have
300 * signalled the semaphore more often than you waited on it with either
301 * OSSemAccept() or OSSemPend().
302 * OS_ERR_EVENT_TYPE If you didn't pass a pointer to a semaphore
C51 COMPILER V7.06 OS_SEM 03/05/2008 20:23:55 PAGE 6
303 * OS_ERR_PEVENT_NULL If 'pevent' is a NULL pointer.
304 *********************************************************************************************************
305 */
306
307 INT8U OSSemPost (OS_EVENT *pevent) reentrant
308 {
309 1 #if OS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */
OS_CPU_SR cpu_sr;
#endif
312 1
313 1
314 1 #if OS_ARG_CHK_EN > 0
315 1 if (pevent == (OS_EVENT *)0) { /* Validate 'pevent' */
316 2 return (OS_ERR_PEVENT_NULL);
317 2 }
318 1 if (pevent->OSEventType != OS_EVENT_TYPE_SEM) { /* Validate event block type */
319 2 return (OS_ERR_EVENT_TYPE);
320 2 }
321 1 #endif
322 1 OS_ENTER_CRITICAL();
323 1 if (pevent->OSEventGrp != 0x00) { /* See if any task waiting for semaphore */
324 2 OS_EventTaskRdy(pevent, (void *)0, OS_STAT_SEM); /* Ready highest prio task waiting on event */
325 2 OS_EXIT_CRITICAL();
326 2 OS_Sched(); /* Find highest priority task ready to run */
327 2 return (OS_NO_ERR);
328 2 }
329 1 if (pevent->OSEventCnt < 65535) { /* Make sure semaphore will not overflow */
330 2 pevent->OSEventCnt++; /* Increment semaphore count to register event */
331 2 OS_EXIT_CRITICAL();
332 2 return (OS_NO_ERR);
333 2 }
334 1 OS_EXIT_CRITICAL(); /* Semaphore value has reached its maximum */
335 1 return (OS_SEM_OVF);
336 1 }
337 /*
338 *********************************************************************************************************
339 * QUERY A SEMAPHORE
340 *
341 * Description: This function obtains information about a semaphore
342 *
343 * Arguments : pevent is a pointer to the event control block associated with the desired
344 * semaphore
345 *
346 * ppdata is a pointer to a structure that will contain information about the
347 * semaphore.
348 *
349 * Returns : OS_NO_ERR The call was successful and the message was sent
350 * OS_ERR_EVENT_TYPE If you are attempting to obtain data from a non semaphore.
351 * OS_ERR_PEVENT_NULL If 'pevent' is a NULL pointer.
352 *********************************************************************************************************
353 */
354
355 #if OS_SEM_QUERY_EN > 0
INT8U OSSemQuery (OS_EVENT *pevent, OS_SEM_DATA *ppdata) reentrant
{
#if OS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */
OS_CPU_SR cpu_sr;
#endif
INT8U *psrc;
INT8U *pdest;
C51 COMPILER V7.06 OS_SEM 03/05/2008 20:23:55 PAGE 7
#if OS_ARG_CHK_EN > 0
if (pevent == (OS_EVENT *)0) { /* Validate 'pevent' */
return (OS_ERR_PEVENT_NULL);
}
if (pevent->OSEventType != OS_EVENT_TYPE_SEM) { /* Validate event block type */
return (OS_ERR_EVENT_TYPE);
}
#endif
OS_ENTER_CRITICAL();
ppdata->OSEventGrp = pevent->OSEventGrp; /* Copy message mailbox wait list */
psrc = &pevent->OSEventTbl[0];
pdest = &ppdata->OSEventTbl[0];
#if OS_EVENT_TBL_SIZE > 0
*pdest++ = *psrc++;
#endif
#if OS_EVENT_TBL_SIZE > 1
*pdest++ = *psrc++;
#endif
#if OS_EVENT_TBL_SIZE > 2
*pdest++ = *psrc++;
#endif
#if OS_EVENT_TBL_SIZE > 3
*pdest++ = *psrc++;
#endif
#if OS_EVENT_TBL_SIZE > 4
*pdest++ = *psrc++;
#endif
#if OS_EVENT_TBL_SIZE > 5
*pdest++ = *psrc++;
#endif
#if OS_EVENT_TBL_SIZE > 6
*pdest++ = *psrc++;
#endif
#if OS_EVENT_TBL_SIZE > 7
*pdest = *psrc;
#endif
ppdata->OSCnt = pevent->OSEventCnt; /* Get semaphore count */
OS_EXIT_CRITICAL();
return (OS_NO_ERR);
}
#endif /* OS_SEM_QUERY_EN */
413 #endif /* OS_SEM_EN */
MODULE INFORMATION: STATIC OVERLAYABLE
CODE SIZE = 774 ----
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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