shell的线程函数实现可能导致线程一直运行

发布于 2021-04-14 22:49:04 浏览：1665 订阅该版

```c
void finsh_thread_entry(void *parameter)
{
    int ch;

/* normal is echo mode */
#ifndef FINSH_ECHO_DISABLE_DEFAULT
    shell->echo_mode = 1;
#else
    shell->echo_mode = 0;
#endif

#ifndef FINSH_USING_MSH_ONLY
    finsh_init(&shell->parser);
#endif

#ifndef RT_USING_POSIX
    /* set console device as shell device */
    if (shell->device == RT_NULL)
    {
        rt_device_t console = rt_console_get_device();
        if (console)
        {
            finsh_set_device(console->parent.name);
        }
    }
#endif

#ifdef FINSH_USING_AUTH
    /* set the default password when the password isn't setting */
    if (rt_strlen(finsh_get_password()) == 0)
    {
        if (finsh_set_password(FINSH_DEFAULT_PASSWORD) != RT_EOK)
        {
            rt_kprintf("Finsh password set failed.\n");
        }
    }
    /* waiting authenticate success */
    finsh_wait_auth();
#endif

rt_kprintf(FINSH_PROMPT);

while (1)
    {
        ch = finsh_getchar();
        if (ch <= 0)
        {
            continue;
        }  
```
如上代码如果在定义了RT_USING_POSIX，finsh_getchar可以一直获取到串口输入，且返回值为0，一直循环下去变成死循环了。