📄 os_task.lst
字号:
OSSched();
} else {
OS_EXIT_CRITICAL();
}
return (OS_NO_ERR);
} else {
OS_EXIT_CRITICAL();
return (OS_TASK_NOT_SUSPENDED);
}
}
}
#endif
558 /*$PAGE*/
559 /*
560 *********************************************************************************************************
561 * STACK CHECKING
562 *
563 * Description: This function is called to check the amount of free memory left on the specified task's
564 * stack.
565 *
566 * Arguments : prio is the task priority
567 *
568 * ppdata is a pointer to a data structure of type OS_STK_DATA.
569 *
570 * Returns : OS_NO_ERR upon success
571 * OS_PRIO_INVALID if the priority you specify is higher that the maximum allowed
572 * (i.e. > OS_LOWEST_PRIO) or, you have not specified OS_PRIO_SELF.
573 * OS_TASK_NOT_EXIST if the desired task has not been created
574 * OS_TASK_OPT_ERR if you did NOT specified OS_TASK_OPT_STK_CHK when the task was created
575 *********************************************************************************************************
576 */
577 #if OS_TASK_CREATE_EXT_EN
INT8U OSTaskStkChk (INT8U prio, OS_STK_DATA DT_XDATA *ppdata) REENTRANT
{
OS_TCB DT_XDATA *ptcb;
OS_STK DT_XDATA *pchk;
INT32U free;
INT32U size;
ppdata->OSFree = 0; /* Assume failure, set to 0 size */
ppdata->OSUsed = 0;
if (prio > OS_LOWEST_PRIO && prio != OS_PRIO_SELF) { /* Make sure task priority is valid */
return (OS_PRIO_INVALID);
}
OS_ENTER_CRITICAL();
C51 COMPILER V7.02a OS_TASK 10/16/2006 15:27:52 PAGE 11
if (prio == OS_PRIO_SELF) { /* See if check for SELF */
prio = OSTCBCur->OSTCBPrio;
}
ptcb = OSTCBPrioTbl[prio];
if (ptcb == (OS_TCB DT_XDATA *)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++ == 0) { /* Compute the number of zero entries on the stk */
free++;
}
#else
while (*pchk-- == 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
622 /*$PAGE*/
623 /*
624 *********************************************************************************************************
625 * SUSPEND A TASK
626 *
627 * Description: This function is called to suspend a task. The task can be the calling task if the
628 * priority passed to OSTaskSuspend() is the priority of the calling task or OS_PRIO_SELF.
629 *
630 * Arguments : prio is the priority of the task to suspend. If you specify OS_PRIO_SELF, the
631 * calling task will suspend itself and rescheduling will occur.
632 *
633 * Returns : OS_NO_ERR if the requested task is suspended
634 * OS_TASK_SUSPEND_IDLE if you attempted to suspend the idle task which is not allowed.
635 * OS_PRIO_INVALID if the priority you specify is higher that the maximum allowed
636 * (i.e. >= OS_LOWEST_PRIO) or, you have not specified OS_PRIO_SELF.
637 * OS_TASK_SUSPEND_PRIO if the task to suspend does not exist
638 *
639 * Note : You should use this function with great care. If you suspend a task that is waiting for
640 * an event (i.e. a message, a semaphore, a queue ...) you will prevent this task from
641 * running when the event arrives.
642 *********************************************************************************************************
643 */
644
645 #if OS_TASK_SUSPEND_EN
INT8U OSTaskSuspend (INT8U prio) REENTRANT
{
BOOLEAN self;
OS_TCB DT_XDATA *ptcb;
if (prio == OS_IDLE_PRIO) { /* Not allowed to suspend idle task */
C51 COMPILER V7.02a OS_TASK 10/16/2006 15:27:52 PAGE 12
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 */
}
if ((ptcb = OSTCBPrioTbl[prio]) == (OS_TCB DT_XDATA *)0) { /* Task to suspend must exis
-t */
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
683 /*$PAGE*/
684 /*
685 *********************************************************************************************************
686 * QUERY A TASK
687 *
688 * Description: This function is called to obtain a copy of the desired task's TCB.
689 *
690 * Arguments : prio is the priority of the task to obtain information from.
691 *
692 * Returns : OS_NO_ERR if the requested task is suspended
693 * OS_PRIO_INVALID if the priority you specify is higher that the maximum allowed
694 * (i.e. > OS_LOWEST_PRIO) or, you have not specified OS_PRIO_SELF.
695 * OS_PRIO_ERR if the desired task has not been created
696 *********************************************************************************************************
697 */
698
699 INT8U OSTaskQuery (INT8U prio, OS_TCB DT_XDATA *ppdata) REENTRANT
700 {
701 1 OS_TCB DT_XDATA *ptcb;
702 1
703 1
704 1 if (prio > OS_LOWEST_PRIO && prio != OS_PRIO_SELF) { /* Task priority valid ? */
705 2 return (OS_PRIO_INVALID);
706 2 }
707 1 OS_ENTER_CRITICAL();
708 1 if (prio == OS_PRIO_SELF) { /* See if suspend SELF */
709 2 prio = OSTCBCur->OSTCBPrio;
710 2 }
711 1 if ((ptcb = OSTCBPrioTbl[prio]) == (OS_TCB DT_XDATA *)0) { /* Task to query must exist
- */
712 2 OS_EXIT_CRITICAL();
C51 COMPILER V7.02a OS_TASK 10/16/2006 15:27:52 PAGE 13
713 2 return (OS_PRIO_ERR);
714 2 }
715 1 *ppdata = *ptcb; /* Copy TCB into user storage area */
716 1 OS_EXIT_CRITICAL();
717 1 return (OS_NO_ERR);
718 1 }
MODULE INFORMATION: STATIC OVERLAYABLE
CODE SIZE = 469 ----
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)
⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -