Re: How to sleep a kernel thread?

From: Francis GALIEGUE (fg@mandrakesoft.com)
Date: Sat Jun 03 2000 - 07:50:54 EDT

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    On Sat, 3 Jun 2000, Matthew Dharm wrote:

    > Will a wait queue work in the situation where we do a "wake up" before the
    > thread is actually "sleeping"?
    >

    Yes. Waking up an empty queue just returns.

    > And what happens if we do wake-ups faster than we sleep -- do wake-ups have
    > an incrementing counter of some sort, or will we lose the multiple wake-ups?
    >

    See above. But I don't really see the problem here: your events are queued
    anyway, so why would this matter?

    > And what if we don't want to be interrupted? Does that still count as
    > running?
    >

    You may then use the normal sleep_on() and wake_up(), instead of
    interruptible_sleep_on() and wake_up_interruptible(). But this means that the
    task will be in D state, ie TASK_UNINTERRUPTIBLE while it takes a nap. But I
    bet you know what you are doing :) 

    -- 
fg

    "You can tune a filesystem but you can't tuna fish" (HP/UX' fsck manpage)

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