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108 lines (95 loc) · 3.72 KB
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/***** BEGIN LICENSE BLOCK *****
* Version: EPL 1.0/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Eclipse Public
* License Version 1.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.eclipse.org/legal/epl-v10.html
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* Copyright (C) 2010 Wayne Meissner
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the EPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the EPL, the GPL or the LGPL.
***** END LICENSE BLOCK *****/
package org.jruby.cext;
import java.lang.ref.Reference;
import java.lang.ref.ReferenceQueue;
import java.lang.ref.WeakReference;
import org.jruby.runtime.builtin.IRubyObject;
/**
*
*/
abstract class Cleaner extends WeakReference<Object> {
private static ReferenceQueue<Object> queue = new ReferenceQueue<Object>();
private static Cleaner list = null;
private Cleaner prev, next;
Cleaner(Object obj) {
super(obj, queue);
}
static void register(Cleaner cleaner) {
if (list != null) {
cleaner.next = list;
list.prev = cleaner;
}
list = cleaner;
}
abstract void dispose();
private static final Runnable reaper = new Runnable() {
public void run() {
while (true) {
Reference ref; // routing around generics here: IBM J9 doesn't like it
try {
ref = queue.remove();
} catch (InterruptedException ex) {
break;
}
GIL.acquire();
try {
do {
if (ref instanceof Cleaner) {
Cleaner r = (Cleaner) ref;
if (r.next != null) {
r.next.prev = r.prev;
}
if (r.prev != null) {
r.prev.next = r.next;
}
if (r == list) {
if (list.next != null) {
list = list.next;
} else {
list = list.prev;
}
}
r.prev = r.next = null;
r.dispose();
r.clear();
}
} while((ref = queue.poll()) != null);
} finally {
GIL.releaseNoCleanup();
}
}
}
};
static {
Thread t = new Thread(reaper, "JRuby C extension cleanup thread");
t.setPriority(Thread.MAX_PRIORITY);
t.setDaemon(true);
t.start();
}
}