RFR: 8254842: [JVMCI] copy thread name when attaching libgraal thread to HotSpot [v2]

[Doug Simon]

On Fri, 16 Oct 2020 17:51:33 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

>> Doug Simon has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   add guarantee to clarify name argument must not be null
>
> src/hotspot/share/jvmci/jvmciCompilerToVM.cpp line 2354:
> 
>> 2352: C2V_VMENTRY_PREFIX(jboolean, attachCurrentThread, (JNIEnv* env, jobject c2vm, jbyteArray name, jboolean
>> as_daemon)) 2353:   if (thread == NULL) {
>> 2354:     // Called from unattached JVMCI shared library thread
> 
> What "unattached" means?

This is a thread that was created and started in libgraal. Libgraal is a JNI library and so any thread it creates that
wants to call into the VM must first
[attach](https://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/invocation.html) itself to the VM.

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PR: https://git.openjdk.java.net/jdk/pull/684