os_task.c
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上传日期:2016-07-26
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- /*
- *********************************************************************************************************
- * uC/OS-II
- * The Real-Time Kernel
- * TASK MANAGEMENT
- *
- * (c) Copyright 1992-2009, Micrium, Weston, FL
- * All Rights Reserved
- *
- * File : OS_TASK.C
- * By : Jean J. Labrosse
- * Version : V2.88
- *
- * LICENSING TERMS:
- * ---------------
- * uC/OS-II is provided in source form for FREE evaluation, for educational use or for peaceful research.
- * If you plan on using uC/OS-II in a commercial product you need to contact Micri祄 to properly license
- * its use in your product. We provide ALL the source code for your convenience and to help you experience
- * uC/OS-II. The fact that the source is provided does NOT mean that you can use it without paying a
- * licensing fee.
- *********************************************************************************************************
- */
- #ifndef OS_MASTER_FILE
- #include <ucos_ii.h>
- #endif
- /*$PAGE*/
- /*
- *********************************************************************************************************
- * CHANGE PRIORITY OF A TASK
- *
- * Description: This function allows you to change the priority of a task dynamically. Note that the new
- * priority MUST be available.
- *
- * Arguments : oldp is the old priority
- *
- * newp is the new priority
- *
- * Returns : OS_ERR_NONE is the call was successful
- * OS_ERR_PRIO_INVALID if the priority you specify is higher that the maximum allowed
- * (i.e. >= OS_LOWEST_PRIO)
- * OS_ERR_PRIO_EXIST if the new priority already exist.
- * OS_ERR_PRIO there is no task with the specified OLD priority (i.e. the OLD task does
- * not exist.
- * OS_ERR_TASK_NOT_EXIST if the task is assigned to a Mutex PIP.
- *********************************************************************************************************
- */
- #if OS_TASK_CHANGE_PRIO_EN > 0
- INT8U OSTaskChangePrio (INT8U oldprio,
- INT8U newprio)
- {
- #if (OS_EVENT_EN)
- OS_EVENT *pevent;
- #if (OS_EVENT_MULTI_EN > 0)
- OS_EVENT **pevents;
- #endif
- #endif
- OS_TCB *ptcb;
- INT8U y_new;
- INT8U x_new;
- INT8U y_old;
- #if OS_LOWEST_PRIO <= 63
- INT8U bity_new;
- INT8U bitx_new;
- INT8U bity_old;
- INT8U bitx_old;
- #else
- INT16U bity_new;
- INT16U bitx_new;
- INT16U bity_old;
- INT16U bitx_old;
- #endif
- #if OS_CRITICAL_METHOD == 3
- OS_CPU_SR cpu_sr = 0; /* Storage for CPU status register */
- #endif
- /*$PAGE*/
- #if OS_ARG_CHK_EN > 0
- if (oldprio >= OS_LOWEST_PRIO) {
- if (oldprio != OS_PRIO_SELF) {
- return (OS_ERR_PRIO_INVALID);
- }
- }
- if (newprio >= OS_LOWEST_PRIO) {
- return (OS_ERR_PRIO_INVALID);
- }
- #endif
- OS_ENTER_CRITICAL();
- if (OSTCBPrioTbl[newprio] != (OS_TCB *)0) { /* New priority must not already exist */
- OS_EXIT_CRITICAL();
- return (OS_ERR_PRIO_EXIST);
- }
- if (oldprio == OS_PRIO_SELF) { /* See if changing self */
- oldprio = OSTCBCur->OSTCBPrio; /* Yes, get priority */
- }
- ptcb = OSTCBPrioTbl[oldprio];
- if (ptcb == (OS_TCB *)0) { /* Does task to change exist? */
- OS_EXIT_CRITICAL(); /* No, can't change its priority! */
- return (OS_ERR_PRIO);
- }
- if (ptcb == OS_TCB_RESERVED) { /* Is task assigned to Mutex */
- OS_EXIT_CRITICAL(); /* No, can't change its priority! */
- return (OS_ERR_TASK_NOT_EXIST);
- }
- #if OS_LOWEST_PRIO <= 63
- y_new = (INT8U)(newprio >> 3); /* Yes, compute new TCB fields */
- x_new = (INT8U)(newprio & 0x07);
- bity_new = (INT8U)(1 << y_new);
- bitx_new = (INT8U)(1 << x_new);
- #else
- y_new = (INT8U)((newprio >> 4) & 0x0F);
- x_new = (INT8U)( newprio & 0x0F);
- bity_new = (INT16U)(1 << y_new);
- bitx_new = (INT16U)(1 << x_new);
- #endif
- OSTCBPrioTbl[oldprio] = (OS_TCB *)0; /* Remove TCB from old priority */
- OSTCBPrioTbl[newprio] = ptcb; /* Place pointer to TCB @ new priority */
- y_old = ptcb->OSTCBY;
- bity_old = ptcb->OSTCBBitY;
- bitx_old = ptcb->OSTCBBitX;
- if ((OSRdyTbl[y_old] & bitx_old) != 0) { /* If task is ready make it not */
- OSRdyTbl[y_old] &= ~bitx_old;
- if (OSRdyTbl[y_old] == 0) {
- OSRdyGrp &= ~bity_old;
- }
- OSRdyGrp |= bity_new; /* Make new priority ready to run */
- OSRdyTbl[y_new] |= bitx_new;
- }
- #if (OS_EVENT_EN)
- pevent = ptcb->OSTCBEventPtr;
- if (pevent != (OS_EVENT *)0) {
- pevent->OSEventTbl[y_old] &= ~bitx_old; /* Remove old task prio from wait list */
- if (pevent->OSEventTbl[y_old] == 0) {
- pevent->OSEventGrp &= ~bity_old;
- }
- pevent->OSEventGrp |= bity_new; /* Add new task prio to wait list */
- pevent->OSEventTbl[y_new] |= bitx_new;
- }
- #if (OS_EVENT_MULTI_EN > 0)
- if (ptcb->OSTCBEventMultiPtr != (OS_EVENT **)0) {
- pevents = ptcb->OSTCBEventMultiPtr;
- pevent = *pevents;
- while (pevent != (OS_EVENT *)0) {
- pevent->OSEventTbl[y_old] &= ~bitx_old; /* Remove old task prio from wait lists */
- if (pevent->OSEventTbl[y_old] == 0) {
- pevent->OSEventGrp &= ~bity_old;
- }
- pevent->OSEventGrp |= bity_new; /* Add new task prio to wait lists */
- pevent->OSEventTbl[y_new] |= bitx_new;
- pevents++;
- pevent = *pevents;
- }
- }
- #endif
- #endif
- ptcb->OSTCBPrio = newprio; /* Set new task priority */
- ptcb->OSTCBY = y_new;
- ptcb->OSTCBX = x_new;
- ptcb->OSTCBBitY = bity_new;
- ptcb->OSTCBBitX = bitx_new;
- OS_EXIT_CRITICAL();
- if (OSRunning == OS_TRUE) {
- OS_Sched(); /* Find new highest priority task */
- }
- return (OS_ERR_NONE);
- }
- #endif
- /*$PAGE*/
- /*
- *********************************************************************************************************
- * CREATE A TASK
- *
- * Description: This function is used to have uC/OS-II manage the execution of a task. Tasks can either
- * be created prior to the start of multitasking or by a running task. A task cannot be
- * created by an ISR.
- *
- * Arguments : task is a pointer to the task's code
- *
- * p_arg is a pointer to an optional data area which can be used to pass parameters to
- * the task when the task first executes. Where the task is concerned it thinks
- * it was invoked and passed the argument 'p_arg' as follows:
- *
- * void Task (void *p_arg)
- * {
- * for (;;) {
- * Task code;
- * }
- * }
- *
- * ptos is a pointer to the task's top of stack. If the configuration constant
- * OS_STK_GROWTH is set to 1, the stack is assumed to grow downward (i.e. from high
- * memory to low memory). 'pstk' will thus point to the highest (valid) memory
- * location of the stack. If OS_STK_GROWTH is set to 0, 'pstk' will point to the
- * lowest memory location of the stack and the stack will grow with increasing
- * memory locations.
- *
- * prio is the task's priority. A unique priority MUST be assigned to each task and the
- * lower the number, the higher the priority.
- *
- * Returns : OS_ERR_NONE if the function was successful.
- * OS_PRIO_EXIT if the task priority already exist
- * (each task MUST have a unique priority).
- * OS_ERR_PRIO_INVALID if the priority you specify is higher that the maximum allowed
- * (i.e. >= OS_LOWEST_PRIO)
- * OS_ERR_TASK_CREATE_ISR if you tried to create a task from an ISR.
- *********************************************************************************************************
- */
- #if OS_TASK_CREATE_EN > 0
- INT8U OSTaskCreate (void (*task)(void *p_arg),
- void *p_arg,
- OS_STK *ptos,
- INT8U prio)
- {
- OS_STK *psp;
- INT8U err;
- #if OS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */
- OS_CPU_SR cpu_sr = 0;
- #endif
- #if OS_ARG_CHK_EN > 0
- if (prio > OS_LOWEST_PRIO) { /* Make sure priority is within allowable range */
- return (OS_ERR_PRIO_INVALID);
- }
- #endif
- OS_ENTER_CRITICAL();
- if (OSIntNesting > 0) { /* Make sure we don't create the task from within an ISR */
- OS_EXIT_CRITICAL();
- return (OS_ERR_TASK_CREATE_ISR);
- }
- if (OSTCBPrioTbl[prio] == (OS_TCB *)0) { /* Make sure task doesn't already exist at this priority */
- OSTCBPrioTbl[prio] = OS_TCB_RESERVED;/* Reserve the priority to prevent others from doing ... */
- /* ... the same thing until task is created. */
- OS_EXIT_CRITICAL();
- psp = OSTaskStkInit(task, p_arg, ptos, 0); /* Initialize the task's stack */
- err = OS_TCBInit(prio, psp, (OS_STK *)0, 0, 0, (void *)0, 0);
- if (err == OS_ERR_NONE) {
- if (OSRunning == OS_TRUE) { /* Find highest priority task if multitasking has started */
- OS_Sched();
- }
- } else {
- OS_ENTER_CRITICAL();
- OSTCBPrioTbl[prio] = (OS_TCB *)0;/* Make this priority available to others */
- OS_EXIT_CRITICAL();
- }
- return (err);
- }
- OS_EXIT_CRITICAL();
- return (OS_ERR_PRIO_EXIST);
- }
- #endif
- /*$PAGE*/
- /*
- *********************************************************************************************************
- * CREATE A TASK (Extended Version)
- *
- * Description: This function is used to have uC/OS-II manage the execution of a task. Tasks can either
- * be created prior to the start of multitasking or by a running task. A task cannot be
- * created by an ISR. This function is similar to OSTaskCreate() except that it allows
- * additional information about a task to be specified.
- *
- * Arguments : task is a pointer to the task's code
- *
- * p_arg is a pointer to an optional data area which can be used to pass parameters to
- * the task when the task first executes. Where the task is concerned it thinks
- * it was invoked and passed the argument 'p_arg' as follows:
- *
- * void Task (void *p_arg)
- * {
- * for (;;) {
- * Task code;
- * }
- * }
- *
- * ptos is a pointer to the task's top of stack. If the configuration constant
- * OS_STK_GROWTH is set to 1, the stack is assumed to grow downward (i.e. from high
- * memory to low memory). 'ptos' will thus point to the highest (valid) memory
- * location of the stack. If OS_STK_GROWTH is set to 0, 'ptos' will point to the
- * lowest memory location of the stack and the stack will grow with increasing
- * memory locations. 'ptos' MUST point to a valid 'free' data item.
- *
- * prio is the task's priority. A unique priority MUST be assigned to each task and the
- * lower the number, the higher the priority.
- *
- * id is the task's ID (0..65535)
- *
- * pbos is a pointer to the task's bottom of stack. If the configuration constant
- * OS_STK_GROWTH is set to 1, the stack is assumed to grow downward (i.e. from high
- * memory to low memory). 'pbos' will thus point to the LOWEST (valid) memory
- * location of the stack. If OS_STK_GROWTH is set to 0, 'pbos' will point to the
- * HIGHEST memory location of the stack and the stack will grow with increasing
- * memory locations. 'pbos' MUST point to a valid 'free' data item.
- *
- * stk_size is the size of the stack in number of elements. If OS_STK is set to INT8U,
- * 'stk_size' corresponds to the number of bytes available. If OS_STK is set to
- * INT16U, 'stk_size' contains the number of 16-bit entries available. Finally, if
- * OS_STK is set to INT32U, 'stk_size' contains the number of 32-bit entries
- * available on the stack.
- *
- * pext is a pointer to a user supplied memory location which is used as a TCB extension.
- * For example, this user memory can hold the contents of floating-point registers
- * during a context switch, the time each task takes to execute, the number of times
- * the task has been switched-in, etc.
- *
- * opt contains additional information (or options) about the behavior of the task. The
- * LOWER 8-bits are reserved by uC/OS-II while the upper 8 bits can be application
- * specific. See OS_TASK_OPT_??? in uCOS-II.H. Current choices are:
- *
- * OS_TASK_OPT_STK_CHK Stack checking to be allowed for the task
- * OS_TASK_OPT_STK_CLR Clear the stack when the task is created
- * OS_TASK_OPT_SAVE_FP If the CPU has floating-point registers, save them
- * during a context switch.
- *
- * Returns : OS_ERR_NONE if the function was successful.
- * OS_PRIO_EXIT if the task priority already exist
- * (each task MUST have a unique priority).
- * OS_ERR_PRIO_INVALID if the priority you specify is higher that the maximum allowed
- * (i.e. > OS_LOWEST_PRIO)
- * OS_ERR_TASK_CREATE_ISR if you tried to create a task from an ISR.
- *********************************************************************************************************
- */
- /*$PAGE*/
- #if OS_TASK_CREATE_EXT_EN > 0
- INT8U OSTaskCreateExt (void (*task)(void *p_arg),
- void *p_arg,
- OS_STK *ptos,
- INT8U prio,
- INT16U id,
- OS_STK *pbos,
- INT32U stk_size,
- void *pext,
- INT16U opt)
- {
- OS_STK *psp;
- INT8U err;
- #if OS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */
- OS_CPU_SR cpu_sr = 0;
- #endif
- #if OS_ARG_CHK_EN > 0
- if (prio > OS_LOWEST_PRIO) { /* Make sure priority is within allowable range */
- return (OS_ERR_PRIO_INVALID);
- }
- #endif
- OS_ENTER_CRITICAL();
- if (OSIntNesting > 0) { /* Make sure we don't create the task from within an ISR */
- OS_EXIT_CRITICAL();
- return (OS_ERR_TASK_CREATE_ISR);
- }
- if (OSTCBPrioTbl[prio] == (OS_TCB *)0) { /* Make sure task doesn't already exist at this priority */
- OSTCBPrioTbl[prio] = OS_TCB_RESERVED;/* Reserve the priority to prevent others from doing ... */
- /* ... the same thing until task is created. */
- OS_EXIT_CRITICAL();
- #if (OS_TASK_STAT_STK_CHK_EN > 0)
- OS_TaskStkClr(pbos, stk_size, opt); /* Clear the task stack (if needed) */
- #endif
- psp = OSTaskStkInit(task, p_arg, ptos, opt); /* Initialize the task's stack */
- err = OS_TCBInit(prio, psp, pbos, id, stk_size, pext, opt);
- if (err == OS_ERR_NONE) {
- if (OSRunning == OS_TRUE) { /* Find HPT if multitasking has started */
- OS_Sched();
- }
- } else {
- OS_ENTER_CRITICAL();
- OSTCBPrioTbl[prio] = (OS_TCB *)0; /* Make this priority avail. to others */
- OS_EXIT_CRITICAL();
- }
- return (err);
- }
- OS_EXIT_CRITICAL();
- return (OS_ERR_PRIO_EXIST);
- }
- #endif
- /*$PAGE*/
- /*
- *********************************************************************************************************
- * DELETE A TASK
- *
- * Description: This function allows you to delete a task. The calling task can delete itself by
- * its own priority number. The deleted task is returned to the dormant state and can be
- * re-activated by creating the deleted task again.
- *
- * Arguments : prio is the priority of the task to delete. Note that you can explicitely delete
- * the current task without knowing its priority level by setting 'prio' to
- * OS_PRIO_SELF.
- *
- * Returns : OS_ERR_NONE if the call is successful
- * OS_ERR_TASK_DEL_IDLE if you attempted to delete uC/OS-II's idle task
- * OS_ERR_PRIO_INVALID if the priority you specify is higher that the maximum allowed
- * (i.e. >= OS_LOWEST_PRIO) or, you have not specified OS_PRIO_SELF.
- * OS_ERR_TASK_DEL if the task is assigned to a Mutex PIP.
- * OS_ERR_TASK_NOT_EXIST if the task you want to delete does not exist.
- * OS_ERR_TASK_DEL_ISR if you tried to delete a task from an ISR
- *
- * Notes : 1) To reduce interrupt latency, OSTaskDel() 'disables' the task:
- * a) by making it not ready
- * b) by removing it from any wait lists
- * c) by preventing OSTimeTick() from making the task ready to run.
- * The task can then be 'unlinked' from the miscellaneous structures in uC/OS-II.
- * 2) The function OS_Dummy() is called after OS_EXIT_CRITICAL() because, on most processors,
- * the next instruction following the enable interrupt instruction is ignored.
- * 3) An ISR cannot delete a task.
- * 4) The lock nesting counter is incremented because, for a brief instant, if the current
- * task is being deleted, the current task would not be able to be rescheduled because it
- * is removed from the ready list. Incrementing the nesting counter prevents another task
- * from being schedule. This means that an ISR would return to the current task which is
- * being deleted. The rest of the deletion would thus be able to be completed.
- *********************************************************************************************************
- */
- #if OS_TASK_DEL_EN > 0
- INT8U OSTaskDel (INT8U prio)
- {
- #if (OS_FLAG_EN > 0) && (OS_MAX_FLAGS > 0)
- OS_FLAG_NODE *pnode;
- #endif
- OS_TCB *ptcb;
- #if OS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */
- OS_CPU_SR cpu_sr = 0;
- #endif
- if (OSIntNesting > 0) { /* See if trying to delete from ISR */
- return (OS_ERR_TASK_DEL_ISR);
- }
- if (prio == OS_TASK_IDLE_PRIO) { /* Not allowed to delete idle task */
- return (OS_ERR_TASK_DEL_IDLE);
- }
- #if OS_ARG_CHK_EN > 0
- if (prio >= OS_LOWEST_PRIO) { /* Task priority valid ? */
- if (prio != OS_PRIO_SELF) {
- return (OS_ERR_PRIO_INVALID);
- }
- }
- #endif
- /*$PAGE*/
- OS_ENTER_CRITICAL();
- if (prio == OS_PRIO_SELF) { /* See if requesting to delete self */
- prio = OSTCBCur->OSTCBPrio; /* Set priority to delete to current */
- }
- ptcb = OSTCBPrioTbl[prio];
- if (ptcb == (OS_TCB *)0) { /* Task to delete must exist */
- OS_EXIT_CRITICAL();
- return (OS_ERR_TASK_NOT_EXIST);
- }
- if (ptcb == OS_TCB_RESERVED) { /* Must not be assigned to Mutex */
- OS_EXIT_CRITICAL();
- return (OS_ERR_TASK_DEL);
- }
- OSRdyTbl[ptcb->OSTCBY] &= ~ptcb->OSTCBBitX;
- if (OSRdyTbl[ptcb->OSTCBY] == 0) { /* Make task not ready */
- OSRdyGrp &= ~ptcb->OSTCBBitY;
- }
-
- #if (OS_EVENT_EN)
- if (ptcb->OSTCBEventPtr != (OS_EVENT *)0) {
- OS_EventTaskRemove(ptcb, ptcb->OSTCBEventPtr); /* Remove this task from any event wait list */
- }
- #if (OS_EVENT_MULTI_EN > 0)
- if (ptcb->OSTCBEventMultiPtr != (OS_EVENT **)0) { /* Remove this task from any events' wait lists*/
- OS_EventTaskRemoveMulti(ptcb, ptcb->OSTCBEventMultiPtr);
- }
- #endif
- #endif
- #if (OS_FLAG_EN > 0) && (OS_MAX_FLAGS > 0)
- pnode = ptcb->OSTCBFlagNode;
- if (pnode != (OS_FLAG_NODE *)0) { /* If task is waiting on event flag */
- OS_FlagUnlink(pnode); /* Remove from wait list */
- }
- #endif
- ptcb->OSTCBDly = 0; /* Prevent OSTimeTick() from updating */
- ptcb->OSTCBStat = OS_STAT_RDY; /* Prevent task from being resumed */
- ptcb->OSTCBStatPend = OS_STAT_PEND_OK;
- if (OSLockNesting < 255u) { /* Make sure we don't context switch */
- OSLockNesting++;
- }
- OS_EXIT_CRITICAL(); /* Enabling INT. ignores next instruc. */
- OS_Dummy(); /* ... Dummy ensures that INTs will be */
- OS_ENTER_CRITICAL(); /* ... disabled HERE! */
- if (OSLockNesting > 0) { /* Remove context switch lock */
- OSLockNesting--;
- }
- OSTaskDelHook(ptcb); /* Call user defined hook */
- OSTaskCtr--; /* One less task being managed */
- OSTCBPrioTbl[prio] = (OS_TCB *)0; /* Clear old priority entry */
- if (ptcb->OSTCBPrev == (OS_TCB *)0) { /* Remove from TCB chain */
- ptcb->OSTCBNext->OSTCBPrev = (OS_TCB *)0;
- OSTCBList = ptcb->OSTCBNext;
- } else {
- ptcb->OSTCBPrev->OSTCBNext = ptcb->OSTCBNext;
- ptcb->OSTCBNext->OSTCBPrev = ptcb->OSTCBPrev;
- }
- ptcb->OSTCBNext = OSTCBFreeList; /* Return TCB to free TCB list */
- OSTCBFreeList = ptcb;
- #if OS_TASK_NAME_EN > 0
- ptcb->OSTCBTaskName = "?"; /* Unknown name */
- #endif
- OS_EXIT_CRITICAL();
- if (OSRunning == OS_TRUE) {
- OS_Sched(); /* Find new highest priority task */
- }
- return (OS_ERR_NONE);
- }
- #endif
- /*$PAGE*/
- /*
- *********************************************************************************************************
- * REQUEST THAT A TASK DELETE ITSELF
- *
- * Description: This function is used to:
- * a) notify a task to delete itself.
- * b) to see if a task requested that the current task delete itself.
- * This function is a little tricky to understand. Basically, you have a task that needs
- * to be deleted however, this task has resources that it has allocated (memory buffers,
- * semaphores, mailboxes, queues etc.). The task cannot be deleted otherwise these
- * resources would not be freed. The requesting task calls OSTaskDelReq() to indicate that
- * the task needs to be deleted. Deleting of the task is however, deferred to the task to
- * be deleted. For example, suppose that task #10 needs to be deleted. The requesting task
- * example, task #5, would call OSTaskDelReq(10). When task #10 gets to execute, it calls
- * this function by specifying OS_PRIO_SELF and monitors the returned value. If the return
- * value is OS_ERR_TASK_DEL_REQ, another task requested a task delete. Task #10 would look like
- * this:
- *
- * void Task(void *p_arg)
- * {
- * .
- * .
- * while (1) {
- * OSTimeDly(1);
- * if (OSTaskDelReq(OS_PRIO_SELF) == OS_ERR_TASK_DEL_REQ) {
- * Release any owned resources;
- * De-allocate any dynamic memory;
- * OSTaskDel(OS_PRIO_SELF);
- * }
- * }
- * }
- *
- * Arguments : prio is the priority of the task to request the delete from
- *
- * Returns : OS_ERR_NONE if the task exist and the request has been registered
- * OS_ERR_TASK_NOT_EXIST if the task has been deleted. This allows the caller to know whether
- * the request has been executed.
- * OS_ERR_TASK_DEL if the task is assigned to a Mutex.
- * OS_ERR_TASK_DEL_IDLE if you requested to delete uC/OS-II's idle task
- * OS_ERR_PRIO_INVALID if the priority you specify is higher that the maximum allowed
- * (i.e. >= OS_LOWEST_PRIO) or, you have not specified OS_PRIO_SELF.
- * OS_ERR_TASK_DEL_REQ if a task (possibly another task) requested that the running task be
- * deleted.
- *********************************************************************************************************
- */
- /*$PAGE*/
- #if OS_TASK_DEL_EN > 0
- INT8U OSTaskDelReq (INT8U prio)
- {
- INT8U stat;
- OS_TCB *ptcb;
- #if OS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */
- OS_CPU_SR cpu_sr = 0;
- #endif
- if (prio == OS_TASK_IDLE_PRIO) { /* Not allowed to delete idle task */
- return (OS_ERR_TASK_DEL_IDLE);
- }
- #if OS_ARG_CHK_EN > 0
- if (prio >= OS_LOWEST_PRIO) { /* Task priority valid ? */
- if (prio != OS_PRIO_SELF) {
- return (OS_ERR_PRIO_INVALID);
- }
- }
- #endif
- if (prio == OS_PRIO_SELF) { /* See if a task is requesting to ... */
- OS_ENTER_CRITICAL(); /* ... this task to delete itself */
- stat = OSTCBCur->OSTCBDelReq; /* Return request status to caller */
- OS_EXIT_CRITICAL();
- return (stat);
- }
- OS_ENTER_CRITICAL();
- ptcb = OSTCBPrioTbl[prio];
- if (ptcb == (OS_TCB *)0) { /* Task to delete must exist */
- OS_EXIT_CRITICAL();
- return (OS_ERR_TASK_NOT_EXIST); /* Task must already be deleted */
- }
- if (ptcb == OS_TCB_RESERVED) { /* Must NOT be assigned to a Mutex */
- OS_EXIT_CRITICAL();
- return (OS_ERR_TASK_DEL);
- }
- ptcb->OSTCBDelReq = OS_ERR_TASK_DEL_REQ; /* Set flag indicating task to be DEL. */
- OS_EXIT_CRITICAL();
- return (OS_ERR_NONE);
- }
- #endif
- /*$PAGE*/
- /*
- *********************************************************************************************************
- * GET THE NAME OF A TASK
- *
- * Description: This function is called to obtain the name of a task.
- *
- * Arguments : prio is the priority of the task that you want to obtain the name from.
- *
- * pname is a pointer to an ASCII string that will receive the name of the task.
- *
- * perr is a pointer to an error code that can contain one of the following values:
- *
- * OS_ERR_NONE if the requested task is resumed
- * OS_ERR_TASK_NOT_EXIST if the task has not been created or is assigned to a Mutex
- * OS_ERR_PRIO_INVALID if you specified an invalid priority:
- * A higher value than the idle task or not OS_PRIO_SELF.
- * OS_ERR_PNAME_NULL You passed a NULL pointer for 'pname'
- * OS_ERR_NAME_GET_ISR You called this function from an ISR
- *
- *
- * Returns : The length of the string or 0 if the task does not exist.
- *********************************************************************************************************
- */
- #if OS_TASK_NAME_EN > 0
- INT8U OSTaskNameGet (INT8U prio,
- INT8U *pname,
- INT8U *perr)
- {
- OS_TCB *ptcb;
- INT8U len;
- #if OS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */
- OS_CPU_SR cpu_sr = 0;
- #endif
- #if OS_ARG_CHK_EN > 0
- if (perr == (INT8U *)0) { /* Validate 'perr' */
- return (0);
- }
- if (prio > OS_LOWEST_PRIO) { /* Task priority valid ? */
- if (prio != OS_PRIO_SELF) {
- *perr = OS_ERR_PRIO_INVALID; /* No */
- return (0);
- }
- }
- if (pname == (INT8U *)0) { /* Is 'pname' a NULL pointer? */
- *perr = OS_ERR_PNAME_NULL; /* Yes */
- return (0);
- }
- #endif
- if (OSIntNesting > 0) { /* See if trying to call from an ISR */
- *perr = OS_ERR_NAME_GET_ISR;
- return (0);
- }
- OS_ENTER_CRITICAL();
- if (prio == OS_PRIO_SELF) { /* See if caller desires it's own name */
- prio = OSTCBCur->OSTCBPrio;
- }
- ptcb = OSTCBPrioTbl[prio];
- if (ptcb == (OS_TCB *)0) { /* Does task exist? */
- OS_EXIT_CRITICAL(); /* No */
- *perr = OS_ERR_TASK_NOT_EXIST;
- return (0);
- }
- if (ptcb == OS_TCB_RESERVED) { /* Task assigned to a Mutex? */
- OS_EXIT_CRITICAL(); /* Yes */
- *perr = OS_ERR_TASK_NOT_EXIST;
- return (0);
- }
- pname = ptcb->OSTCBTaskName;
- len = OS_StrLen(pname);
- OS_EXIT_CRITICAL();
- *perr = OS_ERR_NONE;
- return (len);
- }
- #endif
- /*$PAGE*/
- /*
- *********************************************************************************************************
- * ASSIGN A NAME TO A TASK
- *
- * Description: This function is used to set the name of a task.
- *
- * Arguments : prio is the priority of the task that you want the assign a name to.
- *
- * pname is a pointer to an ASCII string that contains the name of the task.
- *
- * perr is a pointer to an error code that can contain one of the following values:
- *
- * OS_ERR_NONE if the requested task is resumed
- * OS_ERR_TASK_NOT_EXIST if the task has not been created or is assigned to a Mutex
- * OS_ERR_PNAME_NULL You passed a NULL pointer for 'pname'
- * OS_ERR_PRIO_INVALID if you specified an invalid priority:
- * A higher value than the idle task or not OS_PRIO_SELF.
- * OS_ERR_NAME_SET_ISR if you called this function from an ISR
- *
- * Returns : None
- *********************************************************************************************************
- */
- #if OS_TASK_NAME_EN > 0
- void OSTaskNameSet (INT8U prio,
- INT8U *pname,
- INT8U *perr)
- {
- OS_TCB *ptcb;
- #if OS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */
- OS_CPU_SR cpu_sr = 0;
- #endif
- #if OS_ARG_CHK_EN > 0
- if (perr == (INT8U *)0) { /* Validate 'perr' */
- return;
- }
- if (prio > OS_LOWEST_PRIO) { /* Task priority valid ? */
- if (prio != OS_PRIO_SELF) {
- *perr = OS_ERR_PRIO_INVALID; /* No */
- return;
- }
- }
- if (pname == (INT8U *)0) { /* Is 'pname' a NULL pointer? */
- *perr = OS_ERR_PNAME_NULL; /* Yes */
- return;
- }
- #endif
- if (OSIntNesting > 0) { /* See if trying to call from an ISR */
- *perr = OS_ERR_NAME_SET_ISR;
- return;
- }
- OS_ENTER_CRITICAL();
- if (prio == OS_PRIO_SELF) { /* See if caller desires to set it's own name */
- prio = OSTCBCur->OSTCBPrio;
- }
- ptcb = OSTCBPrioTbl[prio];
- if (ptcb == (OS_TCB *)0) { /* Does task exist? */
- OS_EXIT_CRITICAL(); /* No */
- *perr = OS_ERR_TASK_NOT_EXIST;
- return;
- }
- if (ptcb == OS_TCB_RESERVED) { /* Task assigned to a Mutex? */
- OS_EXIT_CRITICAL(); /* Yes */
- *perr = OS_ERR_TASK_NOT_EXIST;
- return;
- }
- ptcb->OSTCBTaskName = pname;
- OS_EXIT_CRITICAL();
- *perr = OS_ERR_NONE;
- }
- #endif
- /*$PAGE*/
- /*
- *********************************************************************************************************
- * RESUME A SUSPENDED TASK
- *
- * Description: This function is called to resume a previously suspended task. This is the only call that
- * will remove an explicit task suspension.
- *
- * Arguments : prio is the priority of the task to resume.
- *
- * Returns : OS_ERR_NONE if the requested task is resumed
- * OS_ERR_PRIO_INVALID if the priority you specify is higher that the maximum allowed
- * (i.e. >= OS_LOWEST_PRIO)
- * OS_ERR_TASK_RESUME_PRIO if the task to resume does not exist
- * OS_ERR_TASK_NOT_EXIST if the task is assigned to a Mutex PIP
- * OS_ERR_TASK_NOT_SUSPENDED if the task to resume has not been suspended
- *********************************************************************************************************
- */
- #if OS_TASK_SUSPEND_EN > 0
- INT8U OSTaskResume (INT8U prio)
- {
- OS_TCB *ptcb;
- #if OS_CRITICAL_METHOD == 3 /* Storage for CPU status register */
- OS_CPU_SR cpu_sr = 0;
- #endif
- #if OS_ARG_CHK_EN > 0
- if (prio >= OS_LOWEST_PRIO) { /* Make sure task priority is valid */
- return (OS_ERR_PRIO_INVALID);
- }
- #endif
- OS_ENTER_CRITICAL();
- ptcb = OSTCBPrioTbl[prio];
- if (ptcb == (OS_TCB *)0) { /* Task to suspend must exist */
- OS_EXIT_CRITICAL();
- return (OS_ERR_TASK_RESUME_PRIO);
- }
- if (ptcb == OS_TCB_RESERVED) { /* See if assigned to Mutex */
- OS_EXIT_CRITICAL();
- return (OS_ERR_TASK_NOT_EXIST);
- }
- if ((ptcb->OSTCBStat & OS_STAT_SUSPEND) != OS_STAT_RDY) { /* Task must be suspended */
- ptcb->OSTCBStat &= ~(INT8U)OS_STAT_SUSPEND; /* Remove suspension */
- if (ptcb->OSTCBStat == OS_STAT_RDY) { /* See if task is now ready */
- if (ptcb->OSTCBDly == 0) {
- OSRdyGrp |= ptcb->OSTCBBitY; /* Yes, Make task ready to run */
- OSRdyTbl[ptcb->OSTCBY] |= ptcb->OSTCBBitX;
- OS_EXIT_CRITICAL();
- if (OSRunning == OS_TRUE) {
- OS_Sched(); /* Find new highest priority task */
- }
- } else {
- OS_EXIT_CRITICAL();
- }
- } else { /* Must be pending on event */
- OS_EXIT_CRITICAL();
- }
- return (OS_ERR_NONE);
- }
- OS_EXIT_CRITICAL();
- return (OS_ERR_TASK_NOT_SUSPENDED);
- }
- #endif
- /*$PAGE*/
- /*
- *********************************************************************************************************
- * STACK CHECKING
- *
- * Description: This function is called to check the amount of free memory left on the specified task's
- * stack.
- *
- * Arguments : prio is the task priority
- *
- * p_stk_data is a pointer to a data structure of type OS_STK_DATA.
- *
- * Returns : OS_ERR_NONE upon success
- * OS_ERR_PRIO_INVALID if the priority you specify is higher that the maximum allowed
- * (i.e. > OS_LOWEST_PRIO) or, you have not specified OS_PRIO_SELF.
- * OS_ERR_TASK_NOT_EXIST if the desired task has not been created or is assigned to a Mutex PIP
- * OS_ERR_TASK_OPT if you did NOT specified OS_TASK_OPT_STK_CHK when the task was created
- * OS_ERR_PDATA_NULL if 'p_stk_data' is a NULL pointer
- *********************************************************************************************************
- */
- #if (OS_TASK_STAT_STK_CHK_EN > 0) && (OS_TASK_CREATE_EXT_EN > 0)
- INT8U OSTaskStkChk (INT8U prio,
- OS_STK_DATA *p_stk_data)
- {
- OS_TCB *ptcb;
- OS_STK *pchk;
- INT32U nfree;
- INT32U size;
- #if OS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */
- OS_CPU_SR cpu_sr = 0;
- #endif
- #if OS_ARG_CHK_EN > 0
- if (prio > OS_LOWEST_PRIO) { /* Make sure task priority is valid */
- if (prio != OS_PRIO_SELF) {
- return (OS_ERR_PRIO_INVALID);
- }
- }
- if (p_stk_data == (OS_STK_DATA *)0) { /* Validate 'p_stk_data' */
- return (OS_ERR_PDATA_NULL);
- }
- #endif
- p_stk_data->OSFree = 0; /* Assume failure, set to 0 size */
- p_stk_data->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_ERR_TASK_NOT_EXIST);
- }
- if (ptcb == OS_TCB_RESERVED) {
- OS_EXIT_CRITICAL();
- return (OS_ERR_TASK_NOT_EXIST);
- }
- if ((ptcb->OSTCBOpt & OS_TASK_OPT_STK_CHK) == 0) { /* Make sure stack checking option is set */
- OS_EXIT_CRITICAL();
- return (OS_ERR_TASK_OPT);
- }
- nfree = 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 */
- nfree++;
- }
- #else
- while (*pchk-- == (OS_STK)0) {
- nfree++;
- }
- #endif
- p_stk_data->OSFree = nfree * sizeof(OS_STK); /* Compute number of free bytes on the stack */
- p_stk_data->OSUsed = (size - nfree) * sizeof(OS_STK); /* Compute number of bytes used on the stack */
- return (OS_ERR_NONE);
- }
- #endif
- /*$PAGE*/
- /*
- *********************************************************************************************************
- * SUSPEND A TASK
- *
- * Description: This function is called to suspend a task. The task can be the calling task if the
- * priority passed to OSTaskSuspend() is the priority of the calling task or OS_PRIO_SELF.
- *
- * Arguments : prio is the priority of the task to suspend. If you specify OS_PRIO_SELF, the
- * calling task will suspend itself and rescheduling will occur.
- *
- * Returns : OS_ERR_NONE if the requested task is suspended
- * OS_ERR_TASK_SUSPEND_IDLE if you attempted to suspend the idle task which is not allowed.
- * OS_ERR_PRIO_INVALID if the priority you specify is higher that the maximum allowed
- * (i.e. >= OS_LOWEST_PRIO) or, you have not specified OS_PRIO_SELF.
- * OS_ERR_TASK_SUSPEND_PRIO if the task to suspend does not exist
- * OS_ERR_TASK_NOT_EXITS if the task is assigned to a Mutex PIP
- *
- * Note : You should use this function with great care. If you suspend a task that is waiting for
- * an event (i.e. a message, a semaphore, a queue ...) you will prevent this task from
- * running when the event arrives.
- *********************************************************************************************************
- */
- #if OS_TASK_SUSPEND_EN > 0
- INT8U OSTaskSuspend (INT8U prio)
- {
- BOOLEAN self;
- OS_TCB *ptcb;
- INT8U y;
- #if OS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */
- OS_CPU_SR cpu_sr = 0;
- #endif
- #if OS_ARG_CHK_EN > 0
- if (prio == OS_TASK_IDLE_PRIO) { /* Not allowed to suspend idle task */
- return (OS_ERR_TASK_SUSPEND_IDLE);
- }
- if (prio >= OS_LOWEST_PRIO) { /* Task priority valid ? */
- if (prio != OS_PRIO_SELF) {
- return (OS_ERR_PRIO_INVALID);
- }
- }
- #endif
- OS_ENTER_CRITICAL();
- if (prio == OS_PRIO_SELF) { /* See if suspend SELF */
- prio = OSTCBCur->OSTCBPrio;
- self = OS_TRUE;
- } else if (prio == OSTCBCur->OSTCBPrio) { /* See if suspending self */
- self = OS_TRUE;
- } else {
- self = OS_FALSE; /* No suspending another task */
- }
- ptcb = OSTCBPrioTbl[prio];
- if (ptcb == (OS_TCB *)0) { /* Task to suspend must exist */
- OS_EXIT_CRITICAL();
- return (OS_ERR_TASK_SUSPEND_PRIO);
- }
- if (ptcb == OS_TCB_RESERVED) { /* See if assigned to Mutex */
- OS_EXIT_CRITICAL();
- return (OS_ERR_TASK_NOT_EXIST);
- }
- y = ptcb->OSTCBY;
- OSRdyTbl[y] &= ~ptcb->OSTCBBitX; /* Make task not ready */
- if (OSRdyTbl[y] == 0) {
- OSRdyGrp &= ~ptcb->OSTCBBitY;
- }
- ptcb->OSTCBStat |= OS_STAT_SUSPEND; /* Status of task is 'SUSPENDED' */
- OS_EXIT_CRITICAL();
- if (self == OS_TRUE) { /* Context switch only if SELF */
- OS_Sched(); /* Find new highest priority task */
- }
- return (OS_ERR_NONE);
- }
- #endif
- /*$PAGE*/
- /*
- *********************************************************************************************************
- * QUERY A TASK
- *
- * Description: This function is called to obtain a copy of the desired task's TCB.
- *
- * Arguments : prio is the priority of the task to obtain information from.
- *
- * p_task_data is a pointer to where the desired task's OS_TCB will be stored.
- *
- * Returns : OS_ERR_NONE if the requested task is suspended
- * OS_ERR_PRIO_INVALID if the priority you specify is higher that the maximum allowed
- * (i.e. > OS_LOWEST_PRIO) or, you have not specified OS_PRIO_SELF.
- * OS_ERR_PRIO if the desired task has not been created
- * OS_ERR_TASK_NOT_EXIST if the task is assigned to a Mutex PIP
- * OS_ERR_PDATA_NULL if 'p_task_data' is a NULL pointer
- *********************************************************************************************************
- */
- #if OS_TASK_QUERY_EN > 0
- INT8U OSTaskQuery (INT8U prio,
- OS_TCB *p_task_data)
- {
- OS_TCB *ptcb;
- #if OS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */
- OS_CPU_SR cpu_sr = 0;
- #endif
- #if OS_ARG_CHK_EN > 0
- if (prio > OS_LOWEST_PRIO) { /* Task priority valid ? */
- if (prio != OS_PRIO_SELF) {
- return (OS_ERR_PRIO_INVALID);
- }
- }
- if (p_task_data == (OS_TCB *)0) { /* Validate 'p_task_data' */
- return (OS_ERR_PDATA_NULL);
- }
- #endif
- OS_ENTER_CRITICAL();
- if (prio == OS_PRIO_SELF) { /* See if suspend SELF */
- prio = OSTCBCur->OSTCBPrio;
- }
- ptcb = OSTCBPrioTbl[prio];
- if (ptcb == (OS_TCB *)0) { /* Task to query must exist */
- OS_EXIT_CRITICAL();
- return (OS_ERR_PRIO);
- }
- if (ptcb == OS_TCB_RESERVED) { /* Task to query must not be assigned to a Mutex */
- OS_EXIT_CRITICAL();
- return (OS_ERR_TASK_NOT_EXIST);
- }
- /* Copy TCB into user storage area */
- OS_MemCopy((INT8U *)p_task_data, (INT8U *)ptcb, sizeof(OS_TCB));
- OS_EXIT_CRITICAL();
- return (OS_ERR_NONE);
- }
- #endif
- /*$PAGE*/
- /*
- *********************************************************************************************************
- * GET THE CURRENT VALUE OF A TASK REGISTER
- *
- * Description: This function is called to obtain the current value of a task register. Task registers
- * are application specific and can be used to store task specific values such as 'error
- * numbers' (i.e. errno), statistics, etc. Each task register can hold a 32-bit value.
- *
- * Arguments : prio is the priority of the task you want to get the task register from. If you
- * specify OS_PRIO_SELF then the task register of the current task will be obtained.
- *
- * id is the 'id' of the desired task register. Note that the 'id' must be less
- * than OS_TASK_REG_TBL_SIZE
- *
- * perr is a pointer to a variable that will hold an error code related to this call.
- *
- * OS_ERR_NONE if the call was successful
- * OS_ERR_PRIO_INVALID if you specified an invalid priority
- * OS_ERR_ID_INVALID if the 'id' is not between 0 and OS_TASK_REG_TBL_SIZE-1
- *
- * Returns : The current value of the task's register or 0 if an error is detected.
- *
- * Note(s) : The maximum number of task variables is 254
- *********************************************************************************************************
- */
- #if OS_TASK_REG_TBL_SIZE > 0
- INT32U OSTaskRegGet (INT8U prio,
- INT8U id,
- INT8U *perr)
- {
- #if OS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */
- OS_CPU_SR cpu_sr = 0;
- #endif
- INT32U value;
- OS_TCB *ptcb;
- #if OS_ARG_CHK_EN > 0
- if (prio >= OS_LOWEST_PRIO) {
- if (prio != OS_PRIO_SELF) {
- *perr = OS_ERR_PRIO_INVALID;
- return (0);
- }
- }
- if (id >= OS_TASK_REG_TBL_SIZE) {
- *perr = OS_ERR_ID_INVALID;
- return (0);
- }
- #endif
- OS_ENTER_CRITICAL();
- if (prio == OS_PRIO_SELF) { /* See if need to get register from current task */
- ptcb = OSTCBCur;
- } else {
- ptcb = OSTCBPrioTbl[prio];
- }
- value = ptcb->OSTCBRegTbl[id];
- OS_EXIT_CRITICAL();
- *perr = OS_ERR_NONE;
- return (value);
- }
- #endif
-
- /*$PAGE*/
- /*
- *********************************************************************************************************
- * SET THE CURRENT VALUE OF A TASK VARIABLE
- *
- * Description: This function is called to change the current value of a task register. Task registers
- * are application specific and can be used to store task specific values such as 'error
- * numbers' (i.e. errno), statistics, etc. Each task register can hold a 32-bit value.
- *
- * Arguments : prio is the priority of the task you want to set the task register for. If you
- * specify OS_PRIO_SELF then the task register of the current task will be obtained.
- *
- * var_id is the 'id' of the desired task register. Note that the 'id' must be less
- * than OS_TASK_REG_TBL_SIZE
- *
- * value is the desired value for the task register.
- *
- * perr is a pointer to a variable that will hold an error code related to this call.
- *
- * OS_ERR_NONE if the call was successful
- * OS_ERR_PRIO_INVALID if you specified an invalid priority
- * OS_ERR_ID_INVALID if the 'id' is not between 0 and OS_TASK_REG_TBL_SIZE-1
- *
- * Returns : The current value of the task's variable or 0 if an error is detected.
- *
- * Note(s) : The maximum number of task variables is 254
- *********************************************************************************************************
- */
- #if OS_TASK_REG_TBL_SIZE > 0
- void OSTaskRegSet (INT8U prio,
- INT8U id,
- INT32U value,
- INT8U *perr)
- {
- #if OS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */
- OS_CPU_SR cpu_sr = 0;
- #endif
- OS_TCB *ptcb;
- #if OS_ARG_CHK_EN > 0
- if (prio >= OS_LOWEST_PRIO) {
- if (prio != OS_PRIO_SELF) {
- *perr = OS_ERR_PRIO_INVALID;
- return;
- }
- }
- if (id >= OS_TASK_REG_TBL_SIZE) {
- *perr = OS_ERR_ID_INVALID;
- return;
- }
- #endif
- OS_ENTER_CRITICAL();
- if (prio == OS_PRIO_SELF) { /* See if need to get register from current task */
- ptcb = OSTCBCur;
- } else {
- ptcb = OSTCBPrioTbl[prio];
- }
- ptcb->OSTCBRegTbl[id] = value;
- OS_EXIT_CRITICAL();
- *perr = OS_ERR_NONE;
- }
- #endif
-
- /*
- *********************************************************************************************************
- * CLEAR TASK STACK
- *
- * Description: This function is used to clear the stack of a task (i.e. write all zeros)
- *
- * Arguments : pbos is a pointer to the task's bottom of stack. If the configuration constant
- * OS_STK_GROWTH is set to 1, the stack is assumed to grow downward (i.e. from high
- * memory to low memory). 'pbos' will thus point to the lowest (valid) memory
- * location of the stack. If OS_STK_GROWTH is set to 0, 'pbos' will point to the
- * highest memory location of the stack and the stack will grow with increasing
- * memory locations. 'pbos' MUST point to a valid 'free' data item.
- *
- * size is the number of 'stack elements' to clear.
- *
- * opt contains additional information (or options) about the behavior of the task. The
- * LOWER 8-bits are reserved by uC/OS-II while the upper 8 bits can be application
- * specific. See OS_TASK_OPT_??? in uCOS-II.H.
- *
- * Returns : none
- *********************************************************************************************************
- */
- #if (OS_TASK_STAT_STK_CHK_EN > 0) && (OS_TASK_CREATE_EXT_EN > 0)
- void OS_TaskStkClr (OS_STK *pbos,
- INT32U size,
- INT16U opt)
- {
- if ((opt & OS_TASK_OPT_STK_CHK) != 0x0000) { /* See if stack checking has been enabled */
- if ((opt & OS_TASK_OPT_STK_CLR) != 0x0000) { /* See if stack needs to be cleared */
- #if OS_STK_GROWTH == 1
- while (size > 0) { /* Stack grows from HIGH to LOW memory */
- size--;
- *pbos++ = (OS_STK)0; /* Clear from bottom of stack and up! */
- }
- #else
- while (size > 0) { /* Stack grows from LOW to HIGH memory */
- size--;
- *pbos-- = (OS_STK)0; /* Clear from bottom of stack and down */
- }
- #endif
- }
- }
- }
- #endif