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    SubjectRe: [PATCH v2] Input: evdev - Add EVIOC mechanism to extract the MT slot state
    On 01/06/2012 11:18 AM, Henrik Rydberg wrote:
    > On Fri, Jan 06, 2012 at 07:55:44PM +0100, Henrik Rydberg wrote:
    >>> 2 different processes should be fine; the problem would be if 2 threads
    >>> of the same process share the same file descriptor. So far the rest of
    >>> evdev copes just fine with multiple threads using the same fd (all
    >>> operations are atomic in this regard), setting ABS_MT_SLOT before
    >>> fetching the state break this property.
    >>
    >> Are we talking about the need for a per-client mutex, or something
    >> more subtle, like introducing indirect coupling between threads
    >> through per-client states? The former ought to be easily remedied.
    >
    > Ok, maybe not to so easy after all, which probably answers my own
    > question. Looks like a EVIOCGMTSLOT, taking both slot and event code
    > as argument, would be the cleaner route to take. Another ioctl, how do we
    > feel about that?

    What's the problem with userspace locking?

    -- Chase


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