RFR: 8168914: Crash in ClassLoaderData/JNIHandleBlock::oops_do during concurrent marking

[Kim Barrett]

> On Feb 20, 2017, at 9:06 AM, Erik Helin <erik.helin at oracle.com> wrote:
> 
> On 02/16/2017 07:51 PM, Kim Barrett wrote:
>> src/share/vm/classfile/classLoaderData.hpp
>> 179     // Only one thread can add a time, guarded by the Metaspace_lock.
>> 
>> Only one thread at a time time can add?
> 
> Yes. See ClassLoaderData::add_handle, all the threads synchronize using
> ClassLoaderData::metaspace_lock().
> 
> Thanks,
> Erik

Sorry for the confusing review comment. That was a suggested rewording to fix gammer in the quoted text, rather than questioning whether it was really mutex protected.