wuyong.c

avr ucos 代码 测试环境：source insight WINAVR 2个进程

#define maxzhan  74
OS_STK TestTaskStk0[maxzhan]; 
OS_STK TestTaskStk1[maxzhan]; 
OS_STK TestTaskStk2[maxzhan]; 
OS_STK TestTaskStk3[maxzhan]; 

void TestTask0(void* pdata); 
 OSTaskCreate(TestTask0,(void*)0,&TestTaskStk0[maxzhan-1],0); 


INT8U  OSTaskCreate (void (*task)(void *p_arg), void *p_arg, OS_STK *ptos, INT8U prio)
{  OS_STK    *psp;
    INT8U      err;
// 优先级无效
#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);