RT-Thread中的内核对象操作API怎么理解

这期内容当中小编将会给大家带来有关RT-Thread中的内核对象操作API怎么理解，文章内容丰富且以专业的角度为大家分析和叙述，阅读完这篇文章希望大家可以有所收获。

背景

• 目的还是学习并熟悉RT-Thread 操作系统。

• 从最简单的对象管理切入

• 了解操作系统最基本的组成单位：Object

内核对象API

内核对象的主要操作方法：内核文件：object.c中实现

知识点

查看内核文件：object.c，发现的主要的几个知识点

验证与测试

• 光看内核代码，不如敲一敲（抄一下）。

• 可以使用模拟器，写几个测试函数，看看对象操作的流程。

测试用例如下：

/* RT-Thread 内核对象学习 */#include struct _obj_type{    enum rt_object_class_type type;    const char* name;};/* 静态的对象定义 */static struct rt_object _obj[] = { 0 };/* 测试用，线程对象 */static const struct _obj_type _obj_tbl[] ={    { RT_Object_Class_Thread, "th_01" },    { RT_Object_Class_Thread, "th_02" },    { RT_Object_Class_Thread, "th_03" },    { RT_Object_Class_Thread, "th_04" },    { RT_Object_Class_Thread, "th_05" },};#define OBJ_TEST_TBL_SIZE       (sizeof(_obj_tbl) / sizeof(_obj_tbl[0]))/* 静态初始化对象 */void obj_test_init(void){    rt_uint8_t index = 0;    rt_uint8_t obj_size = 0;    for (index = 0; index < OBJ_TEST_TBL_SIZE; index++)    {        rt_object_init(&_obj[index], _obj_tbl[index].type, _obj_tbl[index].name);    }}/* 动态创建对象 obj_test_create thread1 */void obj_test_create(uint8_t argc, char** argv){    struct rt_object* obj = RT_NULL;    if (argc >= 2)    {        rt_kprintf(" obj_name=%s\n", argv[1]);    }    obj = rt_object_find(argv[1], RT_Object_Class_Thread);    if (obj != RT_NULL)    {        rt_kprintf("obj_name=%s, exist!!\n", obj->name);        return;    }    else    {        rt_object_allocate(RT_Object_Class_Thread, argv[1]);        rt_kprintf("create obj_name=%s\n", argv[1]);    }}/* 对象的打印 */void obj_test_dump(void){    rt_uint8_t index = 0;    rt_uint8_t obj_size = 0;    struct rt_object* obj_pointers[OBJ_TEST_TBL_SIZE + 10] = { 0 };    obj_size = rt_object_get_pointers(RT_Object_Class_Thread, obj_pointers, sizeof(obj_pointers));    rt_kprintf("object init : object size=%d\n", obj_size);    rt_kprintf("| index |     name     |  flag  |  type  |\n");    rt_kprintf("+-------+--------------+--------+--------+\n");    for (index = 0; index < obj_size; index++)    {        if (obj_pointers[index] == RT_NULL)        {            break;        }        rt_kprintf("|  d  |  s  |   d   |  0xx  |\n", index,            obj_pointers[index]->name, obj_pointers[index]->flag,            obj_pointers[index]->type);    }    rt_kprintf("+-------+--------------+--------+--------+\n");}/* 查找线程对象 */void obj_test_find(uint8_t argc, char** argv){    struct rt_object* obj = RT_NULL;    if (argc >= 2)    {        rt_kprintf(" obj_name=%s\n", argv[1]);    }    obj = rt_object_find(argv[1], RT_Object_Class_Thread);    if (obj != RT_NULL)    {        rt_kprintf("find obj_name=%s\n", obj->name);    }    else    {        rt_kprintf("not find obj_name=%s\n", argv[1]);    }}/* 静态对象 detach */void obj_test_detach(uint8_t argc, char** argv){    struct rt_object* obj = RT_NULL;    if (argc >= 2)    {        rt_kprintf(" obj_name=%s\n", argv[1]);    }    obj = rt_object_find(argv[1], RT_Object_Class_Thread);    if (obj != RT_NULL)    {        rt_kprintf("find obj_name=%s\n", obj->name);        rt_object_detach(obj);        rt_kprintf("detach obj_name=%s\n", obj->name);    }    else    {        rt_kprintf("not find obj_name=%s\n", argv[1]);    }}/* 动态对象 delete */void obj_test_delete(uint8_t argc, char** argv){    struct rt_object* obj = RT_NULL;    if (argc >= 2)    {        rt_kprintf(" obj_name=%s\n", argv[1]);    }    obj = rt_object_find(argv[1], RT_Object_Class_Thread);    if (obj != RT_NULL)    {        rt_kprintf("find obj_name=%s\n", obj->name);        rt_object_delete(obj);        rt_kprintf("delete obj_name=%s\n", obj->name);    }    else    {        rt_kprintf("not find obj_name=%s\n", argv[1]);    }}/* 导出命令 */MSH_CMD_EXPORT(obj_test_init, object init test);MSH_CMD_EXPORT(obj_test_create, obj create test);MSH_CMD_EXPORT(obj_test_dump, object test dump);MSH_CMD_EXPORT(obj_test_find, object test find);MSH_CMD_EXPORT(obj_test_detach, object test detach);MSH_CMD_EXPORT(obj_test_delete, object test del);

学习总结

总结一

• 发现：tshell 是动态创建的线程

• 发现：tidle 是静态的线程

msh />obj_test_dumpobject init : object size=2| index |     name     |  flag  |  type  |+-------+--------------+--------+--------+|  000  |      tshell  |   00   |  0x01  ||  001  |      tidle0  |   00   |  0x81  |+-------+--------------+--------+--------+msh />

总结二

• 动态对象，创建后，内存占用增加。

• 动态对象，删除后，内存占用恢复

msh />freetotal memory: 8388580used memory : 5164  /* 【5164】 内存原有大小 */maximum allocated memory: 7336msh />msh />objobj_test_initobj_test_createobj_test_dumpobj_test_findobj_test_detachobj_test_deletemsh />obj_test_creobj_test_createmsh />obj_test_create hello obj_name=hellocreate obj_name=hellomsh />msh />frefreemsh />freetotal memory: 8388580used memory : 5304   /* 【5304】 内存占用 */maximum allocated memory: 7336msh />msh />obj_test_delete hello obj_name=hellofind obj_name=hellodelete obj_name=hellomsh />freetotal memory: 8388580used memory : 5164  /* 【5304】，内存占用恢复 */maximum allocated memory: 7336msh />

总结三

• 静态初始化的对象，detach（剔除对象管理）后，内存占用不变。

msh />obj_test_initmsh />obobj_test_initobj_test_createobj_test_dumpobj_test_findobj_test_detachobj_test_deletemsh />obj_test_duobj_test_dumpmsh />obj_test_dumpobject init : object size=7| index |     name     |  flag  |  type  |+-------+--------------+--------+--------+|  000  |       th_05  |   00   |  0x81  ||  001  |       th_04  |   00   |  0x81  ||  002  |       th_03  |   00   |  0x81  ||  003  |       th_02  |   00   |  0x81  ||  004  |       th_01  |   00   |  0x81  ||  005  |      tshell  |   00   |  0x01  ||  006  |      tidle0  |   00   |  0x81  |+-------+--------------+--------+--------+msh />freetotal memory: 8388580used memory : 5164maximum allocated memory: 7336msh />msh />objobj_test_initobj_test_createobj_test_dumpobj_test_findobj_test_detachobj_test_deletemsh />obj_test_detaobj_test_detachmsh />obj_test_detach th_04 obj_name=th_04find obj_name=th_04detach obj_name=th_04msh />obj_test_duobj_test_dumpmsh />obj_test_dumpobject init : object size=6| index |     name     |  flag  |  type  |+-------+--------------+--------+--------+|  000  |       th_05  |   00   |  0x81  ||  001  |       th_03  |   00   |  0x81  ||  002  |       th_02  |   00   |  0x81  ||  003  |       th_01  |   00   |  0x81  ||  004  |      tshell  |   00   |  0x01  ||  005  |      tidle0  |   00   |  0x81  |+-------+--------------+--------+--------+msh />msh />freetotal memory: 8388580used memory : 5164maximum allocated memory: 7336

上述就是小编为大家分享的RT-Thread中的内核对象操作API怎么理解了，如果刚好有类似的疑惑，不妨参照上述分析进行理解。如果想知道更多相关知识，欢迎关注行业资讯频道。