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8220238: Enhancing j.l.Runtime/System::gc specification with an explicit 'no guarantee' statement

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Reviewed-by: shade, dholmes, mchung, plevart
This commit is contained in:
Roger Riggs 2019-06-05 10:21:02 -04:00
parent 9e80843829
commit ab88704c67
2 changed files with 24 additions and 16 deletions
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21
src/java.base/share/classes/java/lang/Runtime.java
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@ -1,5 +1,5 @@
/*
* Copyright (c) 1995, 2018, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 1995, 2019, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
@ -639,15 +639,20 @@ public class Runtime {
public native long maxMemory();
/**
* Runs the garbage collector.
* Calling this method suggests that the Java virtual machine expend
* effort toward recycling unused objects in order to make the memory
* they currently occupy available for quick reuse. When control
* returns from the method call, the virtual machine has made
* its best effort to recycle all discarded objects.
* Runs the garbage collector in the Java Virtual Machine.
* <p>
* Calling this method suggests that the Java Virtual Machine
* expend effort toward recycling unused objects in order to
* make the memory they currently occupy available for reuse
* by the Java Virtual Machine.
* When control returns from the method call, the Java Virtual Machine
* has made a best effort to reclaim space from all unused objects.
* There is no guarantee that this effort will recycle any particular
* number of unused objects, reclaim any particular amount of space, or
* complete at any particular time, if at all, before the method returns or ever.
* <p>
* The name {@code gc} stands for "garbage
* collector". The virtual machine performs this recycling
* collector". The Java Virtual Machine performs this recycling
* process automatically as needed, in a separate thread, even if the
* {@code gc} method is not invoked explicitly.
* <p>

19
src/java.base/share/classes/java/lang/System.java
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@ -1782,14 +1782,17 @@ public final class System {
}
/**
* Runs the garbage collector.
*
* Calling the {@code gc} method suggests that the Java Virtual
* Machine expend effort toward recycling unused objects in order to
* make the memory they currently occupy available for quick reuse.
* When control returns from the method call, the Java Virtual
* Machine has made a best effort to reclaim space from all discarded
* objects.
* Runs the garbage collector in the Java Virtual Machine.
* <p>
* Calling the {@code gc} method suggests that the Java Virtual Machine
* expend effort toward recycling unused objects in order to
* make the memory they currently occupy available for reuse
* by the Java Virtual Machine.
* When control returns from the method call, the Java Virtual Machine
* has made a best effort to reclaim space from all unused objects.
* There is no guarantee that this effort will recycle any particular
* number of unused objects, reclaim any particular amount of space, or
* complete at any particular time, if at all, before the method returns or ever.
* <p>
* The call {@code System.gc()} is effectively equivalent to the
* call: