RFR: 8230845: ZGC: Implement ZLock using os::PlatformMutex

[Stefan Karlsson]

Looks good.

StefanK

On 2019-09-11 10:40, Per Liden wrote:
> ZLock is currently shared code but with a POSIX-specific implementation. 
> We now have os::PlatformMutex, so ZLock could just use that instead and 
> be portable. We still want to keep the ZLock class, even though it's now 
> just a wrapper around PlatformMutex, to have the freedom to easily 
> change lock implementation, if such a need should arise.
> 
> Bug: https://bugs.openjdk.java.net/browse/JDK-8230845
> Webrev: http://cr.openjdk.java.net/~pliden/8230845/webrev.0
> 
> /Per