requeue_pi support

[Ulrich Drepper]

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I added now the requeue_pi support for x86-64.  The patch was really not
usable, I rewrote most of it.  Did you actually test your code?  The
FUTEX_WAIT_REQUEUE_PI calls requires an absolute timeout.  This is not
what your code did.

I changed a lot of things in these functions before this change.  So
your patch would apply either.

I haven't tested the new code path.  I did make sure that the code works
on older kernels.  Once a new kernel is available but you can do this as
well.

- --
➧ Ulrich Drepper ➧ Red Hat, Inc. ➧ 444 Castro St ➧ Mountain View, CA ❖
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