RT-Thread-15天入门第二次:滴答时钟 ,线程状态RT-Thread问答社区

15天入门第二次:滴答时钟 ,线程状态

发布于 2018-05-19 01:04:56 浏览：1998 订阅该版

![系统滴答时钟设置相关.png](/uploads/201805/19/005516apdmee6c4lpq644d.png)
滴答时钟是操作系统任务调度的主要驱动力.不是唯一驱动力.那还有什么呢?
rt_thread_delay  线程主动挂起,让出CPU使用权.
线程主要三种状态:运行态,就绪态(只等着调度),挂起态.
有个问题:今天的讲解中,在main 线程中,增加 跑马灯线程, 然后用list_thread 怎么没有main 线程呢?

![线程状态.png](/uploads/201805/19/010308z3osal2o2unrogc0.png)

2.线程控制块:
/**
 * Thread structure
 */
struct rt_thread
{
    /* rt object */
    char        name[RT_NAME_MAX];                      /**< the name of thread */
    rt_uint8_t  type;                                   /**< type of object */
    rt_uint8_t  flags;                                  /**< thread's flags */

#ifdef RT_USING_MODULE
    void       *module_id;                              /**< id of application module */
#endif

rt_list_t   list;                                   /**< the object list */
    rt_list_t   tlist;                                  /**< the thread list */

/* stack point and entry */
    void       *sp;                                     /**< stack point */
    void       *entry;                                  /**< entry */
    void       *parameter;                              /**< parameter */
    void       *stack_addr;                             /**< stack address */
    rt_uint32_t stack_size;                             /**< stack size */

/* error code */
    rt_err_t    error;                                  /**< error code */

rt_uint8_t  stat;                                   /**< thread status */

/* priority */
    rt_uint8_t  current_priority;                       /**< current priority */
    rt_uint8_t  init_priority;                          /**< initialized priority */
#if RT_THREAD_PRIORITY_MAX > 32
    rt_uint8_t  number;
    rt_uint8_t  high_mask;
#endif
    rt_uint32_t number_mask;

#if defined(RT_USING_EVENT)
    /* thread event */
    rt_uint32_t event_set;
    rt_uint8_t  event_info;
#endif

#if defined(RT_USING_SIGNALS)
    rt_sigset_t     sig_pending;                        /**< the pending signals */
    rt_sigset_t     sig_mask;                           /**< the mask bits of signal */

void            *sig_ret;                           /**< the return stack pointer from signal */
    rt_sighandler_t *sig_vectors;                       /**< vectors of signal handler */
    void            *si_list;                           /**< the signal infor list */
#endif

rt_ubase_t  init_tick;                              /**< thread's initialized tick */
    rt_ubase_t  remaining_tick;                         /**< remaining tick */

struct rt_timer thread_timer;                       /**< built-in thread timer */

void (*cleanup)(struct rt_thread *tid);             /**< cleanup function when thread exit */

rt_uint32_t user_data;                              /**< private user data beyond this thread */
};
typedef struct rt_thread *rt_thread_t;
![线程切换.png](https://oss-club.rt-thread.org/uploads/201805/19/010358r5uttnuceu0nduks.png)