📄 os_task.lst
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return (OS_TASK_NOT_SUSPENDED);
}
}
}
#endif
562 /*$PAGE*/
563 /*
564 *********************************************************************************************************
565 * STACK CHECKING
566 *
567 * Description: This function is called to check the amount of free memory left on the specified task's
568 * stack.
569 *
570 * Arguments : prio is the task priority
571 *
572 * dataptr is a pointer to a data structure of type OS_STK_DATA.
573 *
574 * Returns : OS_NO_ERR upon success
575 * OS_PRIO_INVALID if the priority you specify is higher that the maximum allowed
576 * (i.e. > OS_LOWEST_PRIO) or, you have not specified OS_PRIO_SELF.
577 * OS_TASK_NOT_EXIST if the desired task has not been created
578 * OS_TASK_OPT_ERR if you did NOT specified OS_TASK_OPT_STK_CHK when the task was created
579 *********************************************************************************************************
580 */
581 #if OS_TASK_CREATE_EXT_EN
INT8U OSTaskStkChk (INT8U prio, OS_STK_DATA *dataptr)reentrant
{
OS_TCB *ptcb;
OS_STK *pchk;
INT32U free;
INT32U size;
dataptr->OSFree = 0; /* Assume failure, set to 0 size *
-/
dataptr->OSUsed = 0;
if (prio > OS_LOWEST_PRIO && prio != OS_PRIO_SELF) { /* Make sure task priority is valid */
return (OS_PRIO_INVALID);
}
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;
size = ptcb->OSTCBStkSize;
pchk = ptcb->OSTCBStkBottom;
C51 COMPILER V7.10 OS_TASK 05/10/2005 00:01:53 PAGE 11
OS_EXIT_CRITICAL();
#if OS_STK_GROWTH == 1
while (*pchk++ == 0) { /* Compute the number of zero entries on the stk */
free++;
}
#else
while (*pchk-- == 0) {
free++;
}
#endif
dataptr->OSFree = free * sizeof(OS_STK); /* Compute number of free bytes on the stack *
-/
dataptr->OSUsed = (size - free) * sizeof(OS_STK); /* Compute number of bytes used on the stack *
-/
return (OS_NO_ERR);
}
#endif
626 /*$PAGE*/
627 /*
628 *********************************************************************************************************
629 * SUSPEND A TASK
630 *
631 * Description: This function is called to suspend a task. The task can be the calling task if the
632 * priority passed to OSTaskSuspend() is the priority of the calling task or OS_PRIO_SELF.
633 *
634 * Arguments : prio is the priority of the task to suspend. If you specify OS_PRIO_SELF, the
635 * calling task will suspend itself and rescheduling will occur.
636 *
637 * Returns : OS_NO_ERR if the requested task is suspended
638 * OS_TASK_SUSPEND_IDLE if you attempted to suspend the idle task which is not allowed.
639 * OS_PRIO_INVALID if the priority you specify is higher that the maximum allowed
640 * (i.e. >= OS_LOWEST_PRIO) or, you have not specified OS_PRIO_SELF.
641 * OS_TASK_SUSPEND_PRIO if the task to suspend does not exist
642 *
643 * Note : You should use this function with great care. If you suspend a task that is waiting for
644 * an event (i.e. a message, a semaphore, a queue ...) you will prevent this task from
645 * running when the event arrives.
646 *********************************************************************************************************
647 */
648
649 #if OS_TASK_SUSPEND_EN
INT8U OSTaskSuspend (INT8U prio)reentrant
{
BOOLEAN self;
OS_TCB *ptcb;
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);
}
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;
} else {
self = FALSE; /* No suspending another task */
}
C51 COMPILER V7.10 OS_TASK 05/10/2005 00:01:53 PAGE 12
if ((ptcb = OSTCBPrioTbl[prio]) == (OS_TCB *)0) { /* Task to suspend must exist */
OS_EXIT_CRITICAL();
return (OS_TASK_SUSPEND_PRIO);
} else {
if ((OSRdyTbl[ptcb->OSTCBY] &= ~ptcb->OSTCBBitX) == 0) { /* 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 */
OSSched();
}
return (OS_NO_ERR);
}
}
#endif
687 /*$PAGE*/
688 /*
689 *********************************************************************************************************
690 * QUERY A TASK
691 *
692 * Description: This function is called to obtain a copy of the desired task's TCB.
693 *
694 * Arguments : prio is the priority of the task to obtain information from.
695 *
696 * Returns : OS_NO_ERR if the requested task is suspended
697 * OS_PRIO_INVALID if the priority you specify is higher that the maximum allowed
698 * (i.e. > OS_LOWEST_PRIO) or, you have not specified OS_PRIO_SELF.
699 * OS_PRIO_ERR if the desired task has not been created
700 *********************************************************************************************************
701 */
702 #if OS_Task_Query_EN
INT8U OSTaskQuery (INT8U prio, OS_TCB *dataptr)reentrant
{
OS_TCB *ptcb;
if (prio > OS_LOWEST_PRIO && prio != OS_PRIO_SELF) { /* Task priority valid ? */
return (OS_PRIO_INVALID);
}
OS_ENTER_CRITICAL();
if (prio == OS_PRIO_SELF) { /* See if suspend SELF */
prio = OSTCBCur->OSTCBPrio;
}
if ((ptcb = OSTCBPrioTbl[prio]) == (OS_TCB *)0) { /* Task to query must exist */
OS_EXIT_CRITICAL();
return (OS_PRIO_ERR);
}
*dataptr = *ptcb; /* Copy TCB into user storage area *
-/
OS_EXIT_CRITICAL();
return (OS_NO_ERR);
}
#endif
MODULE INFORMATION: STATIC OVERLAYABLE
CODE SIZE = 347 ----
CONSTANT SIZE = ---- ----
XDATA SIZE = ---- ----
PDATA SIZE = ---- ----
DATA SIZE = ---- ----
C51 COMPILER V7.10 OS_TASK 05/10/2005 00:01:53 PAGE 13
IDATA SIZE = ---- ----
BIT SIZE = ---- ----
END OF MODULE INFORMATION.
C51 COMPILATION COMPLETE. 0 WARNING(S), 0 ERROR(S)
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