RFR (S): 8228857: Refactor PlatformMonitor into PlatformMutex and PlatformMonitor

[Kim Barrett]

> On Aug 11, 2019, at 6:31 PM, David Holmes <david.holmes at oracle.com> wrote:
> 
> Hi Dan,
> 
> On 11/08/2019 10:57 pm, Daniel D. Daugherty wrote:
>> On 8/9/19 2:25 AM, David Holmes wrote:
>>> Okay here is v2 with Kim's non-copyable adjustments and an alternate approach to the "impl" class so that the PlatformMutex doesn't have to pay for the unused pthread_cond_t. Trade-off in this scheme is that PlatformMonitor now has two "impl" pointers so consumes more space.
>>> 
>>> Also made comment changes suggested by Dan.
>>> 
>>> http://cr.openjdk.java.net/~dholmes/8228857/webrev.v2/
>> 
> 
> Thanks Dan. Webrev updated in place.

Looks good.