Re: How to sleep a kernel thread?

From: Matthew Dharm (mdharm-kernel@one-eyed-alien.net)
Date: Sat Jun 03 2000 - 05:31:00 EDT

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

    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?

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

    Matt Dharm

    On Sat, Jun 03, 2000 at 09:22:14AM +0100, Russell King wrote:
    > Matthew Dharm writes:
    > > Spinlocks can give me mutual exclusion, but what I need to do is sleep
    > > until there is something in the queue to process. This is a textbook
    > > application of semaphores -- or is the kernel implementation of semaphores
    > > not so textbook?
    >
    > Use wait queues. They have both non-interruptible and interruptible
    > versions. The interruptible version uses TASK_INTERRUPTIBLE, which
    > won't be counted as a running process.
    > _____
    > |_____| ------------------------------------------------- ---+---+-
    > | | Russell King rmk@arm.linux.org.uk --- ---
    > | | | | http://www.arm.linux.org.uk/~rmk/aboutme.html / / |
    > | +-+-+ --- -+-
    > / | THE developer of ARM Linux |+| /|\
    > / | | | --- |
    > +-+-+ ------------------------------------------------- /\\\ | 

    -- 
Matthew Dharm                              Home: mdharm@one-eyed-alien.net 
Senior Engineer, QCP Inc.                            Work: mdharm@qcpi.com

    What the hell are you?
					-- Pitr to Dust Puppy 
User Friendly, 12/3/1997

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