📄 os_task.lst
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}
#endif
564 /*$PAGE*/
565 /*
566 *********************************************************************************************************
567 * STACK CHECKING
568 *
569 * Description: This function is called to check the amount of free memory left on the specified task's
570 * stack.
571 *
572 * Arguments : prio is the task priority
573 *
574 * pdata is a pointer to a data structure of type OS_STK_DATA.
575 *
576 * Returns : OS_NO_ERR upon success
577 * OS_PRIO_INVALID if the priority you specify is higher that the maximum allowed
578 * (i.e. > OS_LOWEST_PRIO) or, you have not specified OS_PRIO_SELF.
579 * OS_TASK_NOT_EXIST if the desired task has not been created
580 * OS_TASK_OPT_ERR if you did NOT specified OS_TASK_OPT_STK_CHK when the task was created
581 *********************************************************************************************************
582 */
583 #if OS_TASK_CREATE_EXT_EN > 0
INT8U OSTaskStkChk (INT8U prio, OS_STK_DATA *ppdata)
{
OS_TCB *ptcb;
OS_STK *pchk;
INT32U free;
INT32U size;
#if OS_ARG_CHK_EN > 0
if (prio > OS_LOWEST_PRIO && prio != OS_PRIO_SELF) { /* Make sure task priority is valid */
return (OS_PRIO_INVALID);
}
#endif
ppdata->OSFree = 0; /* Assume failure, set to 0 size */
ppdata->OSUsed = 0;
OS_ENTER_CRITICAL();
if (prio == OS_PRIO_SELF) { /* See if check for SELF */
prio = OSTCBCur->OSTCBPrio;
}
ptcb = OSTCBPrioTbl[prio];
if (ptcb == (OS_TCB *)0) { /* Make sure task exist */
OS_EXIT_CRITICAL();
return (OS_TASK_NOT_EXIST);
}
if ((ptcb->OSTCBOpt & OS_TASK_OPT_STK_CHK) == 0) { /* Make sure stack checking option is set */
OS_EXIT_CRITICAL();
return (OS_TASK_OPT_ERR);
}
free = 0;
C51 COMPILER V7.50 OS_TASK 08/08/2005 11:36:54 PAGE 11
size = ptcb->OSTCBStkSize;
pchk = ptcb->OSTCBStkBottom;
OS_EXIT_CRITICAL();
#if OS_STK_GROWTH == 1
while (*pchk++ == (OS_STK)0) { /* Compute the number of zero entries on the stk */
free++;
}
#else
while (*pchk-- == (OS_STK)0) {
free++;
}
#endif
ppdata->OSFree = free * sizeof(OS_STK); /* Compute number of free bytes on the stack */
ppdata->OSUsed = (size - free) * sizeof(OS_STK); /* Compute number of bytes used on the stack */
return (OS_NO_ERR);
}
#endif
631 /*$PAGE*/
632 /*
633 *********************************************************************************************************
634 * SUSPEND A TASK
635 *
636 * Description: This function is called to suspend a task. The task can be the calling task if the
637 * priority passed to OSTaskSuspend() is the priority of the calling task or OS_PRIO_SELF.
638 *
639 * Arguments : prio is the priority of the task to suspend. If you specify OS_PRIO_SELF, the
640 * calling task will suspend itself and rescheduling will occur.
641 *
642 * Returns : OS_NO_ERR if the requested task is suspended
643 * OS_TASK_SUSPEND_IDLE if you attempted to suspend the idle task which is not allowed.
644 * OS_PRIO_INVALID if the priority you specify is higher that the maximum allowed
645 * (i.e. >= OS_LOWEST_PRIO) or, you have not specified OS_PRIO_SELF.
646 * OS_TASK_SUSPEND_PRIO if the task to suspend does not exist
647 *
648 * Note : You should use this function with great care. If you suspend a task that is waiting for
649 * an event (i.e. a message, a semaphore, a queue ...) you will prevent this task from
650 * running when the event arrives.
651 *********************************************************************************************************
652 */
653
654 #if OS_TASK_SUSPEND_EN > 0
INT8U OSTaskSuspend (INT8U prio)
{
BOOLEAN self;
OS_TCB *ptcb;
#if OS_ARG_CHK_EN > 0
if (prio == OS_IDLE_PRIO) { /* Not allowed to suspend idle task */
return (OS_TASK_SUSPEND_IDLE);
}
if (prio >= OS_LOWEST_PRIO && prio != OS_PRIO_SELF) { /* Task priority valid ? */
return (OS_PRIO_INVALID);
}
#endif
OS_ENTER_CRITICAL();
if (prio == OS_PRIO_SELF) { /* See if suspend SELF */
prio = OSTCBCur->OSTCBPrio;
self = TRUE;
} else if (prio == OSTCBCur->OSTCBPrio) { /* See if suspending self */
self = TRUE;
C51 COMPILER V7.50 OS_TASK 08/08/2005 11:36:54 PAGE 12
} else {
self = FALSE; /* No suspending another task */
}
ptcb = OSTCBPrioTbl[prio];
if (ptcb == (OS_TCB *)0) { /* Task to suspend must exist */
OS_EXIT_CRITICAL();
return (OS_TASK_SUSPEND_PRIO);
}
if ((OSRdyTbl[ptcb->OSTCBY] &= ~ptcb->OSTCBBitX) == 0x00) { /* Make task not ready */
OSRdyGrp &= ~ptcb->OSTCBBitY;
}
ptcb->OSTCBStat |= OS_STAT_SUSPEND; /* Status of task is 'SUSPENDED' */
OS_EXIT_CRITICAL();
if (self == TRUE) { /* Context switch only if SELF */
OS_Sched();
}
return (OS_NO_ERR);
}
#endif
695 /*$PAGE*/
696 /*
697 *********************************************************************************************************
698 * QUERY A TASK
699 *
700 * Description: This function is called to obtain a copy of the desired task's TCB.
701 *
702 * Arguments : prio is the priority of the task to obtain information from.
703 *
704 * Returns : OS_NO_ERR if the requested task is suspended
705 * OS_PRIO_INVALID if the priority you specify is higher that the maximum allowed
706 * (i.e. > OS_LOWEST_PRIO) or, you have not specified OS_PRIO_SELF.
707 * OS_PRIO_ERR if the desired task has not been created
708 *********************************************************************************************************
709 */
710
711 #if OS_TASK_QUERY_EN > 0
INT8U OSTaskQuery (INT8U prio, OS_TCB *ppdata)
{
OS_TCB *ptcb;
#if OS_ARG_CHK_EN > 0
if (prio > OS_LOWEST_PRIO && prio != OS_PRIO_SELF) { /* Task priority valid ? */
return (OS_PRIO_INVALID);
}
#endif
OS_ENTER_CRITICAL();
if (prio == OS_PRIO_SELF) { /* See if suspend SELF */
prio = OSTCBCur->OSTCBPrio;
}
ptcb = OSTCBPrioTbl[prio];
if (ptcb == (OS_TCB *)0) { /* Task to query must exist */
OS_EXIT_CRITICAL();
return (OS_PRIO_ERR);
}
memcpy(ppdata, ptcb, sizeof(OS_TCB)); /* Copy TCB into user storage area */
OS_EXIT_CRITICAL();
return (OS_NO_ERR);
}
#endif
C51 COMPILER V7.50 OS_TASK 08/08/2005 11:36:54 PAGE 13
MODULE INFORMATION: STATIC OVERLAYABLE
CODE SIZE = 252 ----
CONSTANT SIZE = ---- ----
XDATA SIZE = ---- 11
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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