Kernel signal-信号

50 信号机制在调度时的问题

发布于 2025-08-23 05:42:32 浏览：483 订阅该版

这是rt_schedule部分代码,rtt版本是4.1.1  这个问题还没有解决!!!

问题是当**信号**发给一个**挂起线程**时,rt_hw_context_switch这函数先执行的,13行处使能中断,在pendSV里完成线程切换，去了接收信号线程,为什么还能顺着下面这个函数执行到信号处理的部分呢?

```c
                //如果中断嵌套层数为0
                if (rt_interrupt_nest == 0) 
                {
                    extern void rt_thread_handle_sig(rt_bool_t clean_state);

RT_OBJECT_HOOK_CALL(rt_scheduler_switch_hook, (from_thread));

/*线程中切换上下文*/
                    rt_hw_context_switch((rt_ubase_t)&from_thread->sp,
                            (rt_ubase_t)&to_thread->sp);

/* enable interrupt */
                    rt_hw_interrupt_enable(level);

#ifdef RT_USING_SIGNALS
                    /* check stat of thread for signal */
                    level = rt_hw_interrupt_disable();
                    if (rt_current_thread->stat & RT_THREAD_STAT_SIGNAL_PENDING)
                    {
                        extern void rt_thread_handle_sig(rt_bool_t clean_state);

rt_current_thread->stat &= ~RT_THREAD_STAT_SIGNAL_PENDING;

rt_hw_interrupt_enable(level);

/* check signal status */
                        rt_thread_handle_sig(RT_TRUE);
                    }
                    else
                    {
                        rt_hw_interrupt_enable(level);
                    }
#endif /* RT_USING_SIGNALS */
```

![screenshot_Snipaste_2025-08-28_18-54-42.png](https://oss-club.rt-thread.org/uploads/20250828/a83f23897a27830008acff8cce289ed6.png.webp)