Re: await & asleep

From: Scott Long (scottl_at_samsco.org)
Date: 07/27/05

  • Next message: Daniel Eischen: "Re: await & asleep" 
    Date: Wed, 27 Jul 2005 10:35:01 -0600
To: Daniel Eischen <deischen@freebsd.org>

    Daniel Eischen wrote:
    > On Wed, 27 Jul 2005, Norbert Koch wrote:
    >
    >
    >>>>The functions await() and asleep() in kern_synch.c
    >>>>are marked as EXPERIMENTAL/UNTESTED.
    >>>>Is this comment still valid? Does anyone have used
    >>>>those functions successfully? Should I better not
    >>>>use them in my device driver code for RELENG_4?
    >>>>How do I correctly cancel a request (as I should do
    >>>>according to the man page): "asleep (NULL, 0, NULL, 0)"?
    >>>
    >>>The await family was removed in 5.x and beyond, so trying to
    >>>use them in 4.x will make your driver very unportable. There
    >>>are better ways than await to handle delayed events.
    >
    >
    > Well, there's tsleep() and wakeup() for FreeBSD < 5.0. Other
    > than that, what else can you do? These functions are deprecated
    > in 5.x and 6.x in favor of condvar(9) and mutex(9), so you should
    > really use those instead of tsleep() and wakeup().
    >
    > It seems the kernel in -current is still using tsleep() and
    > wakeup() in some places. I thought we got rid of all these...
    >

    ???? Can you explain why tsleep and wakeup should no longer be
    used? I wasn't aware that they were formally deprecated.

    Scott
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