[Bug 211196] java/openjdk8: thread id missing from jstack output against core files

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=211196

            Bug ID: 211196
           Summary: java/openjdk8: thread id missing from jstack output
                    against core files
           Product: Ports & Packages
           Version: Latest
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: java at FreeBSD.org
          Reporter: ronald.roskens at gmail.com
          Assignee: java at FreeBSD.org
             Flags: maintainer-feedback?(java at FreeBSD.org)

Created attachment 172643
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=172643&action=edit
patch for hotspot/src/os/bsd/vm/os_bsd.cpp

When analyzing a JVM core dump, jstack is unable to display any stacktraces for
any threads because it cannot match any thread id's.

In the JVM on BSD, a thread is represented by two different thread id values,
however, only when defined(__APPLE__) does the second value, unique_thread_id,
get set. Its unique_thread_id that jstack uses to match thread ids in a core
dump.

I've been using the attached two local patches.

patch-rjr-os_bsd.cpp sets unique_thread_id to the same value as the thread_id.
patch-rjr-BsdThread.java adds the unique_thread_id to BsdThread.toString()
output.

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