stan/jdk-24
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

8185093: Expensive multi-core choke point when any graphics objects are created

Browse Source 
Reviewed-by: prr, flar
This commit is contained in:
Sergey Bylokhov 2017-08-04 18:39:23 -07:00
parent 5b641597ae
commit af3dc52333
1 changed files with 49 additions and 43 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
jdk/src/java.desktop/share/classes/java/awt/GraphicsEnvironment.java
View File

@ -1,5 +1,5 @@
/* /*
* Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved. * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
* *
* This code is free software; you can redistribute it and/or modify it * This code is free software; you can redistribute it and/or modify it
@ -54,7 +54,6 @@ import sun.security.action.GetPropertyAction;
*/ */
public abstract class GraphicsEnvironment { public abstract class GraphicsEnvironment {
private static GraphicsEnvironment localEnv;
/** /**
* The headless state of the Toolkit and GraphicsEnvironment * The headless state of the Toolkit and GraphicsEnvironment
@ -74,16 +73,14 @@ public abstract class GraphicsEnvironment {
} }
/** /**
* Returns the local {@code GraphicsEnvironment}. * Lazy initialization of local graphics environment using holder idiom.
* @return the local {@code GraphicsEnvironment}
*/ */
public static synchronized GraphicsEnvironment getLocalGraphicsEnvironment() { private static final class LocalGE {
if (localEnv == null) {
localEnv = createGE();
}
return localEnv; /**
} * The instance of the local {@code GraphicsEnvironment}.
*/
static final GraphicsEnvironment INSTANCE = createGE();
/** /**
* Creates and returns the GraphicsEnvironment, according to the * Creates and returns the GraphicsEnvironment, according to the
@ -122,6 +119,15 @@ public abstract class GraphicsEnvironment {
} }
return ge; return ge;
} }
}
/**
* Returns the local {@code GraphicsEnvironment}.
* @return the local {@code GraphicsEnvironment}
*/
public static GraphicsEnvironment getLocalGraphicsEnvironment() {
return LocalGE.INSTANCE;
}
/** /**
* Tests whether or not a display, keyboard, and mouse can be * Tests whether or not a display, keyboard, and mouse can be