114_尝试OS任务调度优先级最高任务搜索测试

原创

wx5acc709d2a747 2022-03-10 14:14:34 博主文章分类：RTOS ©著作权

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这只是一个测试代码，实际中不可用。实际的设计中，信息更多，结构也更复杂，同时也会用到链表等更高级的数据结构。

这里只是做一个测试。

测试代码：

#include "stdio.h"

#define TASK_NUM 10

typedef unsigned short uint16_t;
typedef unsigned char uint8_t;
typedef enum state_tag
{
    ready = 1,
    sleep = 2,
    suspend = 3
} task_state_t;

typedef struct task_tcb_tag
{
    uint16_t priority;
    task_state_t state;
    uint16_t task_id;
} tcb_t;

tcb_t task_dmeos[TASK_NUM];
uint8_t task_ready_tbl[TASK_NUM];

tcb_t *get_task2run(void)
{
    int i = 0;
    int j = 0;
    int active_task_num = 0;
    int task_rdy_index[TASK_NUM];
    int task_priority[TASK_NUM];
    uint16_t pri_max;

    for (i = 0; i < TASK_NUM; i++)
    {
        if (task_dmeos[i].state == ready)
        {
            task_rdy_index[j] = i;
            task_priority[j] = task_dmeos[i].priority;
            j++;
            active_task_num++;
            printf("%d\n", task_dmeos[i].priority);
        }
    }

    pri_max = task_priority[0];
    j = 0;

    for (i = 1; i < active_task_num; i++)
    {
        if (task_priority[i] > pri_max)
        {
            pri_max = task_priority[i];
            j = i;
        }
    }

    return &task_dmeos[task_rdy_index[j]];
}

int main(void)
{
    tcb_t *p_tcb;

    task_dmeos[0].task_id = 0;
    task_dmeos[1].task_id = 1;
    task_dmeos[2].task_id = 2;
    task_dmeos[3].task_id = 3;
    task_dmeos[4].task_id = 4;
    task_dmeos[5].task_id = 5;
    task_dmeos[6].task_id = 6;
    task_dmeos[7].task_id = 7;
    task_dmeos[8].task_id = 8;
    task_dmeos[9].task_id = 9;
    task_dmeos[0].priority = 0;
    task_dmeos[1].priority = 1;
    task_dmeos[2].priority = 2;
    task_dmeos[3].priority = 13;
    task_dmeos[4].priority = 4;
    task_dmeos[5].priority = 5;
    task_dmeos[6].priority = 6;
    task_dmeos[7].priority = 7;
    task_dmeos[8].priority = 8;
    task_dmeos[9].priority = 9;
    task_dmeos[0].state = sleep;
    task_dmeos[1].state = suspend;
    task_dmeos[3].state = ready;
    task_dmeos[4].state = ready;
    task_dmeos[5].state = ready;
    task_dmeos[6].state = suspend;
    task_dmeos[7].state = sleep;
    task_dmeos[8].state = sleep;
    task_dmeos[9].state = sleep;

    p_tcb = get_task2run();
    printf("priority is : %d\n", p_tcb->priority);
    printf("task id is : %d\n", p_tcb->task_id);

    return 0;
}