cpu_usage/cpu_usage_cmd.c

/*
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date           Author       Notes
 * 2020-12-04     tyx          first implementation
 */
#include <stdlib.h>
#include "cpu_usage.h"

static volatile rt_thread_t tid;

static void load_thread(void *param)
{
    while (tid != RT_NULL && (int)tid->user_data)
    {
        while ((int)tid->user_data >= rt_tick_get() % 100);
        rt_thread_delay(1);
    }
    tid = RT_NULL;
}

void cpu_usage_msh(int argc, char *argv[])
{
    if (argc == 3 && rt_strcmp(argv[1], "-l") == 0)
    {
        if (tid)
        {
            tid->user_data = strtoul(argv[2], RT_NULL, 10);
        }
        else
        {
            tid = rt_thread_create("usage", load_thread, RT_NULL, 256,
                RT_THREAD_PRIORITY_MAX - 2, 20);
            if (tid == RT_NULL)
            {
                rt_kprintf("create thread failed.");
            }
            tid->user_data = strtoul(argv[2], RT_NULL, 10);
            rt_thread_startup(tid);
        }
        rt_kprintf("CPU usage adjusted to %d%c\n", tid->user_data, '%');
    }
    else if (argc == 1)
    {
        rt_kprintf("cpu: %d\n", (int)cpu_load_average());
    }
    else
    {
        rt_kprintf("%s\n", argv[0]);
    }
}
FINSH_FUNCTION_EXPORT_ALIAS(cpu_usage_msh, __cmd_usage, cpu usage);