📄 os_task.lst
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572 /*
573 *********************************************************************************************************
574 * STACK CHECKING
575 *
576 * Description: This function is called to check the amount of free memory left on the specified task's
577 * stack.
578 *
579 * Arguments : prio is the task priority
580 *
581 * pdat is a pointer to a dat structure of type OS_STK_DATA.
582 *
583 * Returns : OS_NO_ERR upon success
584 * OS_PRIO_INVALID if the priority you specify is higher that the maximum allowed
585 * (i.e. > OS_LOWEST_PRIO) or, you have not specified OS_PRIO_SELF.
586 * OS_TASK_NOT_EXIST if the desired task has not been created
587 * OS_TASK_OPT_ERR if you did NOT specified OS_TASK_OPT_STK_CHK when the task was created
588 *********************************************************************************************************
589 */
590 #if OS_TASK_CREATE_EXT_EN > 0
INT8U OSTaskStkChk (INT8U prio, OS_STK_DATA *pdat)KCREENTRANT
{
#if OS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */
OS_CPU_SR cpu_sr;
#endif
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
pdat->OSFree = 0; /* Assume failure, set to 0 size */
pdat->OSUsed = 0;
OS_ENTER_CRITICAL();
if (prio == OS_PRIO_SELF) { /* See if check for SELF */
prio = OSTCBCur->OSTCBPrio;
C51 COMPILER V8.02 OS_TASK 08/05/2007 21:31:19 PAGE 11
}
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;
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
pdat->OSFree = free * sizeof(OS_STK); /* Compute number of free bytes on the stack */
pdat->OSUsed = (size - free) * sizeof(OS_STK); /* Compute number of bytes used on the stack */
return (OS_NO_ERR);
}
#endif
640 /*$PAGE*/
641 /*
642 *********************************************************************************************************
643 * SUSPEND A TASK
644 *
645 * Description: This function is called to suspend a task. The task can be the calling task if the
646 * priority passed to OSTaskSuspend() is the priority of the calling task or OS_PRIO_SELF.
647 *
648 * Arguments : prio is the priority of the task to suspend. If you specify OS_PRIO_SELF, the
649 * calling task will suspend itself and rescheduling will occur.
650 *
651 * Returns : OS_NO_ERR if the requested task is suspended
652 * OS_TASK_SUSPEND_IDLE if you attempted to suspend the idle task which is not allowed.
653 * OS_PRIO_INVALID if the priority you specify is higher that the maximum allowed
654 * (i.e. >= OS_LOWEST_PRIO) or, you have not specified OS_PRIO_SELF.
655 * OS_TASK_SUSPEND_PRIO if the task to suspend does not exist
656 *
657 * Note : You should use this function with great care. If you suspend a task that is waiting for
658 * an event (i.e. a message, a semaphore, a queue ...) you will prevent this task from
659 * running when the event arrives.
660 *********************************************************************************************************
661 */
662
663 #if OS_TASK_SUSPEND_EN > 0
INT8U OSTaskSuspend (INT8U prio)KCREENTRANT
{
#if OS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */
OS_CPU_SR cpu_sr;
#endif
BOOLEAN self;
OS_TCB *ptcb;
#if OS_ARG_CHK_EN > 0
C51 COMPILER V8.02 OS_TASK 08/05/2007 21:31:19 PAGE 12
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;
} else {
self = FALSE; /* No suspending another task */
}
if ((ptcb = OSTCBPrioTbl[prio]) == (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
705 /*$PAGE*/
706 /*
707 *********************************************************************************************************
708 * QUERY A TASK
709 *
710 * Description: This function is called to obtain a copy of the desired task's TCB.
711 *
712 * Arguments : prio is the priority of the task to obtain information from.
713 *
714 * Returns : OS_NO_ERR if the requested task is suspended
715 * OS_PRIO_INVALID if the priority you specify is higher that the maximum allowed
716 * (i.e. > OS_LOWEST_PRIO) or, you have not specified OS_PRIO_SELF.
717 * OS_PRIO_ERR if the desired task has not been created
718 *********************************************************************************************************
719 */
720
721 #if OS_TASK_QUERY_EN > 0
INT8U OSTaskQuery (INT8U prio, OS_TCB *pdat)KCREENTRANT
{
#if OS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */
OS_CPU_SR cpu_sr;
#endif
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();
C51 COMPILER V8.02 OS_TASK 08/05/2007 21:31:19 PAGE 13
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);
}
memcpy(pdat, ptcb, sizeof(OS_TCB)); /* Copy TCB into user storage area */
OS_EXIT_CRITICAL();
return (OS_NO_ERR);
}
#endif
MODULE INFORMATION: STATIC OVERLAYABLE
CODE SIZE = 379 ----
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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