--- a/jdk/src/java.base/share/classes/sun/misc/InnocuousThread.java Thu Feb 11 16:06:02 2016 -0800
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,137 +0,0 @@
-/*
- * Copyright (c) 2013, 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
- * under the terms of the GNU General Public License version 2 only, as
- * published by the Free Software Foundation. Oracle designates this
- * particular file as subject to the "Classpath" exception as provided
- * by Oracle in the LICENSE file that accompanied this code.
- *
- * This code is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
- * version 2 for more details (a copy is included in the LICENSE file that
- * accompanied this code).
- *
- * You should have received a copy of the GNU General Public License version
- * 2 along with this work; if not, write to the Free Software Foundation,
- * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
- *
- * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
- * or visit www.oracle.com if you need additional information or have any
- * questions.
- */
-
-package sun.misc;
-
-import java.security.AccessControlContext;
-import java.security.AccessController;
-import java.security.ProtectionDomain;
-import java.security.PrivilegedAction;
-import java.util.concurrent.atomic.AtomicInteger;
-
-/**
- * A thread that has no permissions, is not a member of any user-defined
- * ThreadGroup and supports the ability to erase ThreadLocals.
- */
-public final class InnocuousThread extends Thread {
- private static final jdk.internal.misc.Unsafe UNSAFE;
- private static final long THREAD_LOCALS;
- private static final long INHERITABLE_THREAD_LOCALS;
- private static final ThreadGroup INNOCUOUSTHREADGROUP;
- private static final AccessControlContext ACC;
- private static final long INHERITEDACCESSCONTROLCONTEXT;
- private static final long CONTEXTCLASSLOADER;
-
- private static final AtomicInteger threadNumber = new AtomicInteger(1);
-
- public InnocuousThread(Runnable target) {
- this(INNOCUOUSTHREADGROUP, target,
- "InnocuousThread-" + threadNumber.getAndIncrement());
- }
-
- public InnocuousThread(Runnable target, String name) {
- this(INNOCUOUSTHREADGROUP, target, name);
- }
-
- public InnocuousThread(ThreadGroup group, Runnable target, String name) {
- super(group, target, name, 0L, false);
- UNSAFE.putOrderedObject(this, INHERITEDACCESSCONTROLCONTEXT, ACC);
- UNSAFE.putOrderedObject(this, CONTEXTCLASSLOADER, ClassLoader.getSystemClassLoader());
- }
-
- @Override
- public void setUncaughtExceptionHandler(UncaughtExceptionHandler x) {
- // silently fail
- }
-
- @Override
- public void setContextClassLoader(ClassLoader cl) {
- // Allow clearing of the TCCL to remove the reference to the system classloader.
- if (cl == null)
- super.setContextClassLoader(null);
- else
- throw new SecurityException("setContextClassLoader");
- }
-
- /**
- * Drops all thread locals (and inherited thread locals).
- */
- public final void eraseThreadLocals() {
- UNSAFE.putObject(this, THREAD_LOCALS, null);
- UNSAFE.putObject(this, INHERITABLE_THREAD_LOCALS, null);
- }
-
- // ensure run method is run only once
- private volatile boolean hasRun;
-
- @Override
- public void run() {
- if (Thread.currentThread() == this && !hasRun) {
- hasRun = true;
- super.run();
- }
- }
-
- // Use Unsafe to access Thread group and ThreadGroup parent fields
- static {
- try {
- ACC = new AccessControlContext(new ProtectionDomain[] {
- new ProtectionDomain(null, null)
- });
-
- // Find and use topmost ThreadGroup as parent of new group
- UNSAFE = jdk.internal.misc.Unsafe.getUnsafe();
- Class<?> tk = Thread.class;
- Class<?> gk = ThreadGroup.class;
-
- THREAD_LOCALS = UNSAFE.objectFieldOffset
- (tk.getDeclaredField("threadLocals"));
- INHERITABLE_THREAD_LOCALS = UNSAFE.objectFieldOffset
- (tk.getDeclaredField("inheritableThreadLocals"));
- INHERITEDACCESSCONTROLCONTEXT = UNSAFE.objectFieldOffset
- (tk.getDeclaredField("inheritedAccessControlContext"));
- CONTEXTCLASSLOADER = UNSAFE.objectFieldOffset
- (tk.getDeclaredField("contextClassLoader"));
-
- long tg = UNSAFE.objectFieldOffset(tk.getDeclaredField("group"));
- long gp = UNSAFE.objectFieldOffset(gk.getDeclaredField("parent"));
- ThreadGroup group = (ThreadGroup)
- UNSAFE.getObject(Thread.currentThread(), tg);
-
- while (group != null) {
- ThreadGroup parent = (ThreadGroup)UNSAFE.getObject(group, gp);
- if (parent == null)
- break;
- group = parent;
- }
- final ThreadGroup root = group;
- INNOCUOUSTHREADGROUP = AccessController.doPrivileged(
- (PrivilegedAction<ThreadGroup>) () ->
- { return new ThreadGroup(root, "InnocuousThreadGroup"); });
- } catch (Exception e) {
- throw new Error(e);
- }
- }
-}