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    SubjectRe: [RFD] Automatic suspend
    On Fri, Feb 27, 2009 at 03:22:39PM +0100, Rafael J. Wysocki wrote:
    > On Friday 27 February 2009, Pavel Machek wrote:
    > > Wakelocks done right are single atomic_t... and if you set it to 0,
    > > you just unblock "sleeper" thread or something. Zero polling and very
    > > simple...
    >
    > Except that you have to check all of the wakelocks periodically in a loop =>
    > polling. So?

    Why do you need to check them? If you're taking this approach you just
    have something like:

    suspend_unblock() {
    if (atomc_dec_and_test(&suspend_lock))
    suspend();
    }

    and then check that the lock count is still 0 after device_suspend().
    There's no need to poll.

    --
    Matthew Garrett | mjg59@srcf.ucam.org


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