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    SubjectRe: [PATCH 1/6] staging: android: binder: Remove some funny && usage
    From
    2009/6/17 Daniel Walker <dwalker@fifo99.com>:
    > On Wed, 2009-06-17 at 14:26 -0700, Arve Hjønnevåg wrote:
    >> On Wed, Jun 17, 2009 at 9:31 AM, Jeremy Fitzhardinge<jeremy@goop.org> wrote:
    >> > On 06/17/09 09:08, Daniel Walker wrote:
    >> ...
    >> > Also, what its usermode ABI is, how stable it is, whether its generally
    >> > useful, does it have glibc/other library support, etc.  Would you ever want
    >> > to use this in a non-Android context?
    >>
    >> You could use this in a non-android context, but the abi is not
    >> stable. There is some documentaion of the current user space api at
    >> http://developer.android.com/reference/android/os/IBinder.html. You
    >> can also find more information at http://www.open-binder.org/ which is
    >> where the api came from.
    >
    > Why does all this need to be done in the kernel? Couldn't any of the
    > current IPC mechanisms be re-used to accomplish this?

    Arve can probably go into more detail here, but I believe the two
    notable properties of the binder that are not present in existing IPC
    mechanisms in the kernel (that I'm aware of) are:
    - avoiding copies by having the kernel copy from the writer into a
    ring buffer in the reader's address space directly (allocating space
    if necessary)
    - managing the lifespan of proxied remoted userspace objects that can
    be shared and passed between processes (upon which the userspace
    binder library builds its remote reference counting model)

    Brian
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