<AWT Dev> [9] Review Request: 8138764 In some cases the usage of TreeLock can be replaced by other synchronization

Sergey Bylokhov Sergey.Bylokhov at oracle.com
Tue Oct 6 14:09:21 UTC 2015

Please review the fix for jdk9, I plan to backport it to jdk8.

In this fix some of synchronizations on TreeLock were removed.

- Component.java(CachedPainter.java) : long time ago this 
synchronization was necessary, because the getGC method iterated over 
hierarchy of components[1], but now it simple getter.
- Window.java : locationByPlatform and opacity are changed to volatile 
and an additional synchronization is removed.

These changes are subset of my fix for JDK-6765536, which is safe to 
backport to jdk8.


Bug: https://bugs.openjdk.java.net/browse/JDK-8138764
Webrev can be found at: http://cr.openjdk.java.net/~serb/8138764/webrev.00

Best regards, Sergey.

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