RFR: 8145083: Use semaphore instead of mutex for synchronization of Unified Logging configuration

[Kim Barrett]

On Dec 14, 2015, at 9:53 AM, Marcus Larsson <marcus.larsson at oracle.com> wrote:
> 
> Hi,
> 
> New webrev:
> http://cr.openjdk.java.net/~mlarsson/8145083/webrev.01/
> 
> Incremental:
> http://cr.openjdk.java.net/~mlarsson/8145083/webrev.00-01/

One minor nit:

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src/share/vm/logging/logConfiguration.hpp 
  72   class ConfigurationLocker {

Shouldn't this be derived from StackObj?

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