RFR: 8334215: serviceability/dcmd/thread/PrintMountedVirtualThread.java failing with JTREG_TEST_THREAD_FACTORY=Virtual

[Alan Bateman]

On Mon, 17 Jun 2024 12:35:15 GMT, David Holmes <dholmes at openjdk.org> wrote:

> We need a comment explaining why we have to check for this as without knowing the implementation quirks it seems non-sensical for a thread to have mounted itself!

Just to note that JavaThread._vthread is always the "current thread". It's the virtual thread when mounted, the carrier (as in itself) when there is no virtual thread mounted. It's one this way so that the C2 instrinic for currentThread doesn't need a branch/test.

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PR Review Comment: https://git.openjdk.org/jdk/pull/19744#discussion_r1642772079