stack is close to end of stack address意义

发布于 2022-10-19 09:33:40 浏览：1329 订阅该版

```c
#ifdef RT_USING_OVERFLOW_CHECK
static void _rt_scheduler_stack_check(struct rt_thread *thread)
{
    RT_ASSERT(thread != RT_NULL);

#if defined(ARCH_CPU_STACK_GROWS_UPWARD)
    if (*((rt_uint8_t *)((rt_ubase_t)thread->stack_addr + thread->stack_size - 1)) != '#' ||
#else
    if (*((rt_uint8_t *)thread->stack_addr) != '#' ||
#endif
        (rt_ubase_t)thread->sp <= (rt_ubase_t)thread->stack_addr ||
        (rt_ubase_t)thread->sp >
        (rt_ubase_t)thread->stack_addr + (rt_ubase_t)thread->stack_size)
    {
        rt_ubase_t level;

rt_kprintf("thread:%s stack overflow\n", thread->name);
#ifdef RT_USING_FINSH
        {
            extern long list_thread(void);
            list_thread();
        }
#endif
        level = rt_hw_interrupt_disable();
        while (level);
    }
#if defined(ARCH_CPU_STACK_GROWS_UPWARD)
    else if ((rt_ubase_t)thread->sp > ((rt_ubase_t)thread->stack_addr + thread->stack_size))
    {
        rt_kprintf("warning: %s stack is close to the top of stack address.\n",
                   thread->name);
    }
#else
    else if ((rt_ubase_t)thread->sp <= ((rt_ubase_t)thread->stack_addr + 32))
    {
        rt_kprintf("warning: %s stack is close to end of stack address.\n",
                   thread->name);
    }
#endif
}
#endif
```

rtt 3.1.4版本，最近出去产品运行两个多月后，发生了一起线程堆栈异常的问题，串口狂打印
`“stack is close to end of stack address”`。

看代码，是系统检查线程堆栈快用完的提示。对这个日志打印的意义看不懂：
1. 开发调试时就会关注线程堆栈使用率，所以开发调试过程中压根就不会让这情况出现
2. 已出去的产品，因狂打印这个日志，让系统在半死不死状态

所以，要么不如不打印这日志或者仅打印一次，要么让其堆栈溢出使系统复位重启