hg: jdk9/sandbox/jdk: 8050499: (ch) NativeSignal.signal fails with error 316 on OS X

[chris.hegarty at oracle.com]

Changeset: 7b17bff2ea36
Author:    bpb
Date:      2016-01-05 13:57 -0800
URL:       http://hg.openjdk.java.net/jdk9/sandbox/jdk/rev/7b17bff2ea36

8050499: (ch) NativeSignal.signal fails with error 316 on OS X
Summary: Do not throw an exception when ESRCH returned by pthread_kill() on OS X.
Reviewed-by: alanb

! src/java.base/unix/native/libnio/ch/NativeThread.c
+ test/java/nio/channels/DatagramChannel/StressNativeSignal.java