Function _console_take

src/kservice.c:239–270

}

static void _console_take(void)
{
    rt_ubase_t level = rt_spin_lock_irqsave(&_syscon_lock);
    rt_thread_t self_thread = rt_thread_self();
    rt_base_t critical_level;
    RT_UNUSED(critical_level);

    while (_pr_curr_user != self_thread)
    {
        if (_pr_curr_user == RT_NULL)
        {
            /* no preemption is allowed to avoid dead lock */
            critical_level = rt_enter_critical();
#ifdef RT_USING_DEBUG
            _pr_critical_level = _syscon_lock.critical_level;
            _syscon_lock.critical_level = critical_level;
#endif
            _pr_curr_user = self_thread;
            break;
        }
        else
        {
            rt_spin_unlock_irqrestore(&_syscon_lock, level);
            rt_thread_yield();
            level = rt_spin_lock_irqsave(&_syscon_lock);
        }
    }

    _pr_curr_user_nested++;

    rt_spin_unlock_irqrestore(&_syscon_lock, level);
}

static void _console_release(void)
{