RFR: 8266857: PipedOutputStream.sink should be volatile

[Liam Miller-Cushon]

On Tue, 11 May 2021 10:19:52 GMT, Daniel Fuchs <dfuchs at openjdk.org> wrote:

> For correctness (and peace of mind)- we should probably introduce a local variable in all the places where `sink` is read more than once outside of a synchronized block

Done, thanks!

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PR: https://git.openjdk.java.net/jdk/pull/3960