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8219197: ThreadGroup.enumerate() may return wrong value

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ThreadGroup.enumerate(list,n,recurse) should never return a value that is less than n.

Reviewed-by: clanger, chegar, prappo
This commit is contained in:
Daniel Fuchs 2019-03-13 18:43:16 +00:00
parent a54066705f
commit 5f13ffec66
2 changed files with 118 additions and 4 deletions
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7
src/java.base/share/classes/java/lang/ThreadGroup.java
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@ -1,5 +1,5 @@
/*
* Copyright (c) 1995, 2012, 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
@ -27,7 +27,6 @@ package java.lang;
import java.io.PrintStream;
import java.util.Arrays;
import jdk.internal.misc.VM;
/**
* A thread group represents a set of threads. In addition, a thread
@ -425,7 +424,7 @@ class ThreadGroup implements Thread.UncaughtExceptionHandler {
ThreadGroup[] groupsSnapshot = null;
synchronized (this) {
if (destroyed) {
return 0;
return n;
}
int nt = nthreads;
if (nt > list.length - n) {
@ -559,7 +558,7 @@ class ThreadGroup implements Thread.UncaughtExceptionHandler {
ThreadGroup[] groupsSnapshot = null;
synchronized (this) {
if (destroyed) {
return 0;
return n;
}
int ng = ngroups;
if (ng > list.length - n) {