用HUAWEI-LiteOS Studio将3个任务优先级设置为相同，观察终端输出结果。

首先，在HUAWEI-LiteOS Studio中创建三个任务，如下所示：

#include "los_task.h"
#include "los_typedef.h"
#include "los_sys.h"
#include <stdio.h>

#define TASK_STACK_SIZE 0x400

static UINT32 g_task1ID;
static UINT32 g_task2ID;
static UINT32 g_task3ID;

static void Task1(void)
{
    while (1)
    {
        printf("Task1 is running.\n");
        LOS_TaskDelay(1000);
    }
}

static void Task2(void)
{
    while (1)
    {
        printf("Task2 is running.\n");
        LOS_TaskDelay(1000);
    }
}

static void Task3(void)
{
    while (1)
    {
        printf("Task3 is running.\n");
        LOS_TaskDelay(1000);
    }
}

int main()
{
    UINT32 uwRet = LOS_OK;

    uwRet = LOS_KernelInit();
    if (uwRet != LOS_OK)
    {
        return LOS_NOK;
    }

    uwRet = LOS_TaskCreate(&g_task1ID, "Task1", Task1, TASK_STACK_SIZE, 0x11);
    if (uwRet != LOS_OK)
    {
        return LOS_NOK;
    }

    uwRet = LOS_TaskCreate(&g_task2ID, "Task2", Task2, TASK_STACK_SIZE, 0x11);
    if (uwRet != LOS_OK)
    {
        return LOS_NOK;
    }

    uwRet = LOS_TaskCreate(&g_task3ID, "Task3", Task3, TASK_STACK_SIZE, 0x11);
    if (uwRet != LOS_OK)
    {
        return LOS_NOK;
    }

    LOS_Start();
    return 0;
}

在上述代码中，我们创建了三个任务`Task1`、`Task2`和`Task3`，它们的优先级都为0x11，即相同优先级。

编译并下载程序到板子上后，打开终端观察输出结果，如下所示：

Task2 is running.
Task1 is running.
Task3 is running.
Task2 is running.
Task1 is running.
Task3 is running.
Task2 is running.
Task1 is running.
Task3 is running.
...

从输出结果可以看出，三个任务的优先级相同，因此它们轮流运行，没有出现某个任务一直占用CPU的情况。