RFR: 8230845: ZGC: Implement ZLock using os::PlatformMutex
per.liden at oracle.com
Wed Sep 11 08:40:54 UTC 2019
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.
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