On Sat, 25 Jun 2005, Denis Vlasenko wrote:
> schedule_timeout(timeout)
> Whee, it has a comment! :)
> * %TASK_UNINTERRUPTIBLE - at least @timeout jiffies are guaranteed to
> * pass before the routine returns. The routine will return 0
> *
> * %TASK_INTERRUPTIBLE - the routine may return early if a signal is
> * delivered to the current task. In this case the remaining time
> * in jiffies will be returned, or 0 if the timer expired in time
> *
> * The current task state is guaranteed to be TASK_RUNNING when this
> * routine returns.
> Thus:
> set_current_state(TASK_[UN]INTERRUPTIBLE);
> schedule_timeout(timeout_in_jiffies)
>
> msleep(ms)
> Sleeps at least ms msecs.
> Equivalent to:
> set_current_state(TASK_UNINTERRUPTIBLE);
> schedule_timeout(timeout)
If and only if you are not on any waitqueue. You may not be interrupted
by a signal, but you still can be woken with an explicit wake_up()
HTH
Oliver
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