[9] RFR of 8071599: (so) Socket adapter sendUrgentData throws IllegalBlockingMode when channel configured non-blocking

[Brian Burkhalter]

Please review at your convenience. Note that this follows from previous discussions [1, 2].

Issue:	https://bugs.openjdk.java.net/browse/JDK-8071599
Patch:	http://cr.openjdk.java.net/~bpb/8071599/webrev.00/

This patch passes the JPRT job with testset core and onlytests jdk_nio.

The changes to SocketChannelImpl.{java,c} are intended to guarantee consistent exception behavior across all platforms. If this is not considered important, then those changes could be suppressed and the SocketAdaptor change

    public void sendUrgentData(int data) throws IOException {
        synchronized (sc.blockingLock()) {
            int n = sc.sendOutOfBandData((byte) data);
            if (n == 0)
                throw new IOException("Socket buffer full");
        }
    }

should suffice.

Thanks,

Brian

[1] http://mail.openjdk.java.net/pipermail/core-libs-dev/2015-February/031698.html (should have been in nio-dev)
[2] http://mail.openjdk.java.net/pipermail/nio-dev/2015-February/003042.html
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