/// Description: Put this process to sleep. We will wake up when the// IIC controller interrupts.//staticvoidiic_ibmocp_waitforpin(void*data){inttimeout =2;structiic_ibm*priv_data=data;/// If interrupts are enabled (which they are), then put the process to// sleep. This process wil...
intjit_read_queue(char*buf,char**start,off_toffset,intlen,intunused){/* delay one second (or the chosen value), before printing */unsignedlongj= jiffies + jit_delay * HZ;structwait_queue*wait=NULL;current->timeout = j;interruptible_sleep_on(&wait);returnjit_print(buf); } 开发者ID:...
The interruptible_sleep, has also that deviation , but less frequent (once per batch), and the overall picture shows that it is more accurate. On the other hand, I have read that the interruptible_sleep is less stable and gets into race conditions. The question is : Did everyone tried ...
> atomic_inc(&ch->n_on_msg_allocate_wq); > - ret = interruptible_sleep_on_timeout(&ch->msg_allocate_wq, 1); > + prepare_to_wait(&ch->msg_allocate_wq, &wait, TASK_INTERRUPTIBLE); > + ret = schedule_timeout(1); > + finish_wait(&ch->msg_allocate_wq, &wait); > atomic_d...
* wait_event_interruptible_timeout - sleep until a condition gets true or a timeout elapses *@wq: the waitqueue to wait on *@condition: a C expression for the event to wait for *@timeout: timeout, in jiffies * * The process is put to sleep (TASK_INTERRUPTIBLE) until the ...
492行用于debug,wait_event_interruptible_timeout在condition不为true时会休眠,因此不能在原子上下文中调用,这里加入might_sleep,如果用户在原子上下中调用wait_event_interruptible_timeout会打印出调用栈,方便尽早发现问题。 493行判断当前条件是否已满足 <include/linux/wait.h> ...
此处唤醒的操作使用到的函数是wake_up,然后进程A使用wait_event_interruptible_timeout让自己睡觉。下面详细分析其中的机制: wait_event_interruptible_timeout:sleep util a condition get true or a timeout elapses 记得以前看侯捷老师那本MFC架构分析时,最吸引人的概念是事件触发模型,事件触发模型很好理解,但是AA事...
只要将进程状态设置为 TASK_UNINTERRUPTIBLE,然后触发任务切换将当前任务切走,此时在解析后的trace上看prev线程就是D状态的,若是 TASK_INTERRUPTIBLE,trace上看就是sleep状态。UNINTERRUPTIBLE 的意思是不被信号唤醒。 2. 使用逻辑 (1) 和 schedule_timeout 配合使用,延时到期后由定时器到期后由 process_timeout 函数...
withTimeout(100) { runInterruptible(Dispatchers.IO) { interruptibleBlockingCall() } } }.onFailure { println("Caught exception: $it") } println("End") } } private fun interruptibleBlockingCall() { Thread.sleep(3000) } Prints 11:06:29.259 I Start ...
TASK_INTERRUPTIBLE是可以被信号和wake_up()唤醒的,当信号到来时,进程会被设置为可运行。 而TASK_UNINTERRUPTIBLE只能被wake_up()唤醒。 信号本质 信号是在软件层次上对中断机制的一种模拟,软中断 信号来源 信号事件的发生有两个来源: 硬件来源:(比如我们按下了键盘或者其它硬件故障); ...