RFR 7004967: SecureRandom should be more explicit about threading

[Wang Weijun]

Ping again.

There is an updated version at http://cr.openjdk.java.net/~weijun/7004967/webrev.01/ with doc-only changes.

Thanks
Max

> On Aug 25, 2016, at 10:00 AM, Weijun Wang <weijun.wang at oracle.com> wrote:
> 
> Please review the enhancement at
> 
>  http://cr.openjdk.java.net/~weijun/7004967/webrev.00/
> 
> Basically, we want SecureRandom to be more efficient by removing all synchronized keywords from its public methods and let an implementation to take care of thread-safety (We already did some in JDK-8098581). On the other hand, we need to make sure that existing implementations that have not synchronized correctly to behave just as good as before.
> 
> Therefore a new Service Attribute "ThreadSafe" is introduced. If you think your implementation is already thread-safe, set it to "true" and SecureRandom will be happy. Otherwise, don't set it and SecureRandom will continuously call your SecureRandomSpi engine methods in synchronized blocks.
> 
> Thanks
> Max