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    SubjectRe: [linux-pm] [PATCH 1/8] PM: Add suspend block api.
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    On Fri, 2010-05-07 at 22:03 +0100, Matthew Garrett wrote:

    > Here's a different example. A process is waiting for a keypress, but
    > because it's badly written it's also drawing to the screen at 60 frames
    > per second and preventing the system from every going to idle. How do
    > you quiesce the system while still ensuring that the keypress will be
    > delivered to the application?

    To me it's somewhat of a negative for suspend blockers. Since to solve
    the problem you give above you would have to use a suspend blocker in an
    asynchronous way (locked in an interrupt, released in a thread too)
    assuming I understand your example. I've had my share of semaphore
    nightmares, and I'm not too excited to see a protection scheme (i.e. a
    lock) which allows asynchronous usage like suspend blockers.

    Daniel



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