adding rsockets support into JDK

[Alan Bateman]

On 17/12/2018 18:18, Lu, Yingqi wrote:
> Hi Alan,
>
> Thank you for your suggestion. I just want to confirm that you meant all the RDMA based socket channels and server socket channels will be created as non-blocking initially? Later, if application sets them to be blocking, we then do the emulation.
>
> If this is the case, do we need to specify it in the Javadoc since the tcp based channels are created to be blocking?
>
This doesn't impact anyone using the API, this is just about emulating 
blocking behavior with an rsocket that is non-blocking. The rational is 
to keep the native code as simple as possible so that the native methods 
are a single syscall rather than many. Whether we need this of course 
depends on whether the bug in the Linux RDMA library will be fixed or 
not. Maybe we need to see if Sean can help progress the bug there before 
spending time on this.

-Alan