10 ulog输出一次后所有进程都没了

发布于 2022-03-17 20:59:42 浏览：608 订阅该版

调用一次ulog打印后所有线程都被杀了，在shell里ps没有任何进程了，本来有好几个线程再跑，代码如下：

```
static void encoder1( void *parameter){
//引脚初识化

rt_pin_mode(ENCODER_PIN, PIN_MODE_INPUT);
    rt_pin_attach_irq(ENCODER_PIN, PIN_IRQ_MODE_FALLING, encoder_irq, RT_NULL);
    /* 使 能 中 断 */
    rt_pin_irq_enable(ENCODER_PIN, PIN_IRQ_ENABLE);

/* 创 建 一 个 动 态 信 号 量， 初 始 值 是 0 */
    speed_sem = rt_sem_create("speed_sem", 0, RT_IPC_FLAG_FIFO);
    if (speed_sem == RT_NULL) {
    rt_kprintf("create speed_sem semaphore failed.\n");
    }
    else
    {
    rt_kprintf("create done. speed_sem semaphore value = 0.\n");
    }

while(1)
    {
        rt_err_t result;
        result = rt_sem_take(speed_sem, RT_WAITING_FOREVER);
        if (result != RT_EOK) {
        rt_kprintf(" take a speed_sem semaphore, failed.\n");
        rt_sem_delete(speed_sem);
        return; }
        else
        {
           //rt_kprintf("sem ok\n");
           speed=6.66*1000/(tick_arr[1]-tick_arr[0]);
           LOG_I("speed");

}

}
}

```