5 rt_thread_create()创建线程时候，初始化的定时器的作用是什么

发布于 2022-07-05 14:30:04 浏览：735 订阅该版

2 个回答

jizhongbiao 2022-07-05

这家伙很懒，什么也没写！

用来控制挂起时间的。例如你主动调用delay或者阻塞于获取信号量等都会用到这个定时器。截取了一段信号量获取函数中的源码：
`

/* start */
rt_ipc_list_suspend(&(sem->parent.suspend_thread),
                                thread,
                                sem->parent.parent.flag);

/* has waiting time, start thread timer */
            if (time > 0)
            {
                RT_DEBUG_LOG(RT_DEBUG_IPC, ("set thread:%s to timer list\n",
                                            thread->name));

/* reset the timeout of thread timer and start it */
                rt_timer_control(&(thread->thread_timer),
                                 RT_TIMER_CTRL_SET_TIME,
                                 &time);
                rt_timer_start(&(thread->thread_timer));
            }

/* enable interrupt */
            rt_hw_interrupt_enable(temp);

/* do schedule */
            rt_schedule();  rt_ipc_list_suspend(&(sem->parent.suspend_thread),
                                thread,
                                sem->parent.parent.flag);

/* enable interrupt */
            rt_hw_interrupt_enable(temp);

/* do schedule */
            rt_schedule();`