下面是程序代码，需要完成上面的功能
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/*
*********************************************************************************************************
*                                                uC/OS-II
*                                          The Real-Time Kernel
*
*                        (c) Copyright 1992-1998, Jean J. Labrosse, Plantation, FL
*                                           All Rights Reserved
*
*                                                 V2.00
*
*                                               EXAMPLE #2
*********************************************************************************************************
*/

#include "includes.h"

/*
*********************************************************************************************************
*                                              CONSTANTS
*********************************************************************************************************
*/

#define          TASK_STK_SIZE     512                /* Size of each task's stacks (# of WORDs)       */

#define          TASK_START_ID       0                /* Application tasks IDs                         */
#define          TASK_CLK_ID         1
#define          TASK_1_ID           2                
#define          TASK_2_ID           3
#define          TASK_3_ID           4
#define          TASK_4_ID           5
#define          TASK_5_ID           6

#define          TASK_START_PRIO    10                /* Application tasks priorities                  */
#define          TASK_CLK_PRIO      11
#define          TASK_1_PRIO        12                
#define          TASK_2_PRIO        13
#define          TASK_3_PRIO        14
#define          TASK_4_PRIO        15
#define          TASK_5_PRIO        16

/*
*********************************************************************************************************
*                                              VARIABLES
*********************************************************************************************************
*/

OS_STK           TaskStartStk[TASK_STK_SIZE];         /* Startup    task stack                         */
OS_STK           TaskClkStk[TASK_STK_SIZE];           /* Clock      task stack                         */
OS_STK           Task1Stk[TASK_STK_SIZE];             /* Task #1    task stack                         */
OS_STK           Task2Stk[TASK_STK_SIZE];             /* Task #2    task stack                         */
OS_STK           Task3Stk[TASK_STK_SIZE];             /* Task #3    task stack                         */
OS_STK           Task4Stk[TASK_STK_SIZE];             /* Task #4    task stack                         */
OS_STK           Task5Stk[TASK_STK_SIZE];             /* Task #5    task stack                         */

OS_EVENT        *AckMbox;                             /* Message mailboxes for Tasks #4 and #5         */
OS_EVENT        *TxMbox;

/*
*********************************************************************************************************
*                                         FUNCTION PROTOTYPES
*********************************************************************************************************
*/

void             TaskStart(void *data);               /* Function prototypes of tasks                  */
void             TaskClk(void *data);
void             Task1(void *data);
void             Task2(void *data);
void             Task3(void *data);
void             Task4(void *data);
void             Task5(void *data);

/*$PAGE*/
/*
*********************************************************************************************************
*                                                  MAIN
*********************************************************************************************************
*/

void main (void)
{
    PC_DispClrScr(DISP_FGND_WHITE);                        /* 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 */
    
    PC_ElapsedInit();                                      /* Initialized elapsed time measurement     */
    
    OSTaskCreateExt(TaskStart, (void *)0, &TaskStartStk[TASK_STK_SIZE-1], TASK_START_PRIO,
                   TASK_START_ID, &TaskStartStk[0], TASK_STK_SIZE, (void *)0, 
                   OS_TASK_OPT_STK_CHK | OS_TASK_OPT_STK_CLR);
                   
    OSStart();                                             /* Start multitasking                       */
}
/*$PAGE*/
/*
*********************************************************************************************************
*                                               STARTUP TASK
*********************************************************************************************************
*/

void  TaskStart (void *data)
{
    char   s[80];
    INT16S key;

    data = data;                                           /* Prevent compiler warning                 */
    
    PC_DispStr(26,  0, "uC/OS-II, The Real-Time Kernel", DISP_FGND_WHITE + DISP_BGND_RED + DISP_BLINK);
    PC_DispStr(33,  1, "Jean J. Labrosse", DISP_FGND_WHITE);
    PC_DispStr(36,  3, "EXAMPLE #2", DISP_FGND_WHITE);
    PC_DispStr( 0,  9, "Task           Total Stack  Free Stack  Used Stack  ExecTime (uS)", DISP_FGND_WHITE);
    PC_DispStr( 0, 10, "-------------  -----------  ----------  ----------  -------------", DISP_FGND_WHITE);
    PC_DispStr( 0, 12, "TaskStart():", DISP_FGND_WHITE);
    PC_DispStr( 0, 13, "TaskClk()  :", DISP_FGND_WHITE);
    PC_DispStr( 0, 14, "Task1()    :", DISP_FGND_WHITE);
    PC_DispStr( 0, 15, "Task2()    :", DISP_FGND_WHITE);
    PC_DispStr( 0, 16, "Task3()    :", DISP_FGND_WHITE);
    PC_DispStr( 0, 17, "Task4()    :", DISP_FGND_WHITE);
    PC_DispStr( 0, 18, "Task5()    :", DISP_FGND_WHITE);
    PC_DispStr(28, 24, "  <-PRESS 'ESC' TO QUIT->  ", DISP_FGND_WHITE + DISP_BLINK);

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

    PC_DispStr(0, 22, "Determining  CPU's capacity ...", DISP_FGND_WHITE);  
    OSStatInit();                                          /* Initialize uC/OS-II's statistics         */
    PC_DispClrLine(22, DISP_FGND_WHITE + DISP_BGND_BLACK);

    AckMbox = OSMboxCreate((void *)0);                     /* Create 2 message mailboxes               */
    TxMbox  = OSMboxCreate((void *)0);
    
    OSTaskCreateExt(TaskClk, (void *)0, &TaskClkStk[TASK_STK_SIZE-1], TASK_CLK_PRIO, 
                   TASK_CLK_ID, &TaskClkStk[0], TASK_STK_SIZE, (void *)0, 
                   OS_TASK_OPT_STK_CHK | OS_TASK_OPT_STK_CLR);

    OSTaskCreateExt(Task1, (void *)0, &Task1Stk[TASK_STK_SIZE-1], TASK_1_PRIO,
                   TASK_1_ID, &Task1Stk[0], TASK_STK_SIZE, (void *)0, 
                   OS_TASK_OPT_STK_CHK | OS_TASK_OPT_STK_CLR);

    OSTaskCreateExt(Task2, (void *)0, &Task2Stk[TASK_STK_SIZE-1], TASK_2_PRIO, 
                   TASK_2_ID, &Task2Stk[0], TASK_STK_SIZE, (void *)0, 
                   OS_TASK_OPT_STK_CHK | OS_TASK_OPT_STK_CLR);
                   
    OSTaskCreateExt(Task3, (void *)0, &Task3Stk[TASK_STK_SIZE-1], TASK_3_PRIO, 
                   TASK_3_ID, &Task3Stk[0], TASK_STK_SIZE, (void *)0, 
                   OS_TASK_OPT_STK_CHK | OS_TASK_OPT_STK_CLR);

    OSTaskCreateExt(Task4, (void *)0,  ......

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