Some generic questions about the virtual thread.

[nadeesh t v]

Hello,


I have some generic  questions about virtual threads after reading the  JEP
444 <https://openjdk.org/jeps/444>, JEP 491 <https://openjdk.org/jeps/491> .
I did  not find those answers by googling or in some Devoxx/JVMLS talks
that I have watched. That’s why I am reaching out here. Please redirect me
if it’s not the appropriate place.


What is the reason behind making a virtual thread daemon thread?

Does it mean we should use virtual thread only if we do not care about its
completion  before shutdown of JVM?


IN JEP 444, I could see `The scheduler does not compensate for pinning by
expanding its parallelism.` Is it based on the assumption that other tasks
may wait for the same lock or is it  because of some other technical
reasons around pinning?


In JEP 491 <https://openjdk.org/jeps/491>, I could see the in-depth detail
of the reason behind pinning for synchronized cases. Could someone share
what would be the reason behind pinning in case of the JNI method
invocation? I could see the JEP mentions `presence of native frame on
stack` . Therefore, I am guessing it’s something around that but if someone
could give a bit more detail about it that would  be helpful.

-- 
Thanks and Regards,
Nadeesh TV
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