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8044187: Enhancements to InnocuousThread

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Reviewed-by: alanb
This commit is contained in:
Chris Hegarty 2014-06-18 10:44:24 +01:00
parent 31a7b46b00
commit 74ad666e62
1 changed files with 28 additions and 6 deletions
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34
jdk/src/java.base/share/classes/sun/misc/InnocuousThread.java
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@ -26,7 +26,10 @@
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
@ -36,22 +39,35 @@ import java.security.ProtectionDomain;
*/
public final class InnocuousThread extends Thread {
private static final Unsafe UNSAFE;
private static final ThreadGroup THREADGROUP;
private static final ThreadGroup INNOCUOUSTHREADGROUP;
private static final AccessControlContext ACC;
private static final long THREADLOCALS;
private static final long INHERITABLETHREADLOCALS;
private static final long INHERITEDACCESSCONTROLCONTEXT;
private static final AtomicInteger threadNumber = new AtomicInteger(1);
public InnocuousThread(Runnable target) {
super(THREADGROUP, target, "anInnocuousThread");
this(INNOCUOUSTHREADGROUP, target,
"InnocuousThread-" + threadNumber.getAndIncrement());
}
public InnocuousThread(Runnable target, String name) {
this(INNOCUOUSTHREADGROUP, target, name);
}
private InnocuousThread(ThreadGroup group, Runnable target, String name) {
super(group, target, name);
UNSAFE.putOrderedObject(this, INHERITEDACCESSCONTROLCONTEXT, ACC);
eraseThreadLocals();
}
// always report system class loader, or null
private ClassLoader contextClassLoader = ClassLoader.getSystemClassLoader();
@Override
public ClassLoader getContextClassLoader() {
// always report system class loader
return ClassLoader.getSystemClassLoader();
return contextClassLoader;
}
@Override
@ -61,7 +77,10 @@ public final class InnocuousThread extends Thread {
@Override
public void setContextClassLoader(ClassLoader cl) {
throw new SecurityException("setContextClassLoader");
if (cl == null)
contextClassLoader = null;
else
throw new SecurityException("setContextClassLoader");
}
// ensure run method is run only once
@ -113,7 +132,10 @@ public final class InnocuousThread extends Thread {
break;
group = parent;
}
THREADGROUP = new ThreadGroup(group, "InnocuousThreadGroup");
final ThreadGroup root = group;
INNOCUOUSTHREADGROUP = AccessController.doPrivileged(
(PrivilegedAction<ThreadGroup>) () ->
{ return new ThreadGroup(root, "InnocuousThreadGroup"); });
} catch (Exception e) {
throw new Error(e);
}