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    SubjectRe: [linux-pm] [PATCH 1/8] PM: Add suspend block api.
    On Fri, May 07, 2010 at 02:30:20PM -0700, Daniel Walker wrote:
    > 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.

    Check the input patch for an example of this.

    Matthew Garrett |

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