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6926623: Thread clone issues

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Reviewed-by: hawtin
This commit is contained in:
Chris Hegarty 2010-06-30 16:08:47 +01:00
parent 833dfdcbf2
commit 0a47db80ed
1 changed files with 42 additions and 1 deletions
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43
jdk/src/share/classes/java/lang/Thread.java
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@ -260,6 +260,10 @@ class Thread implements Runnable {
/* Remembered Throwable from stop before start */
private Throwable throwableFromStop;
/* Whether or not the Thread has been completely constructed;
* init or clone method has successfully completed */
private volatile Thread me; // null
/**
* Returns a reference to the currently executing thread object.
*
@ -411,6 +415,43 @@ class Thread implements Runnable {
/* Set thread ID */
tid = nextThreadID();
this.me = this;
}
/**
* Returns a clone if the class of this object is {@link Cloneable Cloneable}.
*
* @return a clone if the class of this object is {@code Cloneable}
*
* @throws CloneNotSupportedException
* if this method is invoked on a class that does not
* support {@code Cloneable}
*/
@Override
protected Object clone() throws CloneNotSupportedException {
Thread t;
synchronized(this) {
t = (Thread) super.clone();
t.tid = nextThreadID();
t.parkBlocker = null;
t.blocker = null;
t.blockerLock = new Object();
t.threadLocals = null;
group.checkAccess();
group.addUnstarted();
t.setPriority(priority);
final Thread current = Thread.currentThread();
if (current.inheritableThreadLocals != null)
t.inheritableThreadLocals =
ThreadLocal.createInheritedMap(current.inheritableThreadLocals);
}
t.me = t;
return t;
}
/**
@ -672,7 +713,7 @@ class Thread implements Runnable {
*
* A zero status value corresponds to state "NEW".
*/
if (threadStatus != 0)
if (threadStatus != 0 || this != me)
throw new IllegalThreadStateException();
/* Notify the group that this thread is about to be started