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刚学UC/OS ，有不懂的请教各位

void main (void)
{
PC_DispClrScr(DISP_FGND_WHITE + DISP_BGND_BLACK); /* Clear the screen */

OSInit(); /* Initialize uC/OS-II */

PC_DOSSaveReturn(); /* Save environment to return to DOS */
PC_VectSet(uCOS, OSCtxSw); /* Install uC/OS-II's context switch vector */

RandomSem = OSSemCreate(1); /* Random number semaphore */

OSTaskCreate(TaskStart, (void *)0, &TaskStartStk[TASK_STK_SIZE - 1], 0);
OSStart(); /* Start multitasking */
}

void TaskStart (void *pdata)
{
#if OS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */
OS_CPU_SR cpu_sr;
#endif
char s[100];
INT16S key;

pdata = pdata; /* Prevent compiler warning */

TaskStartDispInit(); /* Initialize the display */

OS_ENTER_CRITICAL();
PC_VectSet(0x08, OSTickISR); /* Install uC/OS-II's clock tick ISR */
PC_SetTickRate(OS_TICKS_PER_SEC); /* Reprogram tick rate */
OS_EXIT_CRITICAL();

OSStatInit(); /* Initialize uC/OS-II's statistics */

TaskStartCreateTasks(); /* Create all the application tasks */

for (;;) {
TaskStartDisp(); /* Update the display */

if (PC_GetKey(&key) == TRUE) { /* See if key has been pressed */
if (key == 0x1B) { /* Yes, see if it's the ESCAPE key */
PC_DOSReturn(); /* Return to DOS */
}
}

OSCtxSwCtr = 0; /* Clear context switch counter */
OSTimeDlyHMSM(0, 0, 1, 0); /* Wait one second */
}
}

问：怎么确认临界代码段，main中红色部分的不是，而在taskstar中的是，加关闭中断处理？？？