RFR: Ensure vthread has connected to server

[Alan Bateman]

On Mon, 6 Sep 2021 04:56:24 GMT, Miao Zheng <github.com+20216587+miao-zheng at openjdk.org> wrote:

> I have run the test case of InterruptHttp.java in fast debug version of jdk with options:
> -XX:+UseG1GC  -XX:+ScavengeALot -XX:ScavengeALotInterval=200 -XX:-GCALotAtAllSafepoints
> 
> And the test case failed, The output is "Execution failed: `main' threw exception: java.lang.RuntimeException: Expected 1 HTTP connection"
> 
> The reason is Thread.sleep(1000) can not ensure that vthread has connected to server when using some options and fastdebug version of jdk.
> 
> So, I fix this to ensure vthread has connected to server.

test/jdk/java/lang/Thread/virtual/InterruptHttp.java line 60:

> 58:             while (thread.getState() != Thread.State.WAITING) {
> 59:                 Thread.sleep(1000);
> 60:             }

Thanks for this. You are right that that the test is problematic. Can you try the following instead of polling the thread state? This will wait until a connection is established so that the read is interrupted.


while (server.connectionCount() == 0) {
    Thread.sleep(100);
}

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PR: https://git.openjdk.java.net/loom/pull/60