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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) 2009 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.util.Map;
 
The cext GC keeps track of native handles and associates them with their corresponding Java objects to avoid garbage-collection while either is in use. It will remove unused references when a thread exits native code or the VM runs out of memory.
 
 public class GC {
 
     private static final Map<ObjectHandlenativeHandles = new WeakIdentityHashMap();
     private static final ScheduledExecutorService executor = Executors.newSingleThreadScheduledExecutor(new DaemonThreadFactory());
     private static volatile Reference<Objectreaper = null;
     private static Runnable gcTask;
     private static volatile Future<?> gcFuture;
     private static final AtomicInteger gcDisable = new AtomicInteger();

    
This is an upcall from the C++ stub to mark objects that are only strongly reachable from a C VALUE instance.

Parameters:
obj The object to mark
 
 
     public static final void mark(IRubyObject obj) {
     }
 
     public static final void trigger() {
         if ( == null || .isDone()) {
              = .submit();
         }
     }
 
     static void init(final Native n) {
          = new Runnable() {
             public void run() {
                 if (.get() == 0) {
                     GIL.acquire();
                     try {
                         n.gc();
                     } finally {
                         GIL.releaseNoCleanup();
                     }
                 }
             }
         };
     }
 
     static final Handle lookup(IRubyObject obj) {
         return obj instanceof RubyBasicObject 
                 ? (Handle) ((RubyBasicObjectobj).getNativeHandle()
                 : .get(obj);
     }

    
Called from Handle.valueOf

Parameters:
obj
    static final void register(IRubyObject objHandle h) {
        if (obj instanceof RubyBasicObject) {
            ((RubyBasicObjectobj).setNativeHandle(h);
        } else {
            .put(objh);
        }
        Cleaner.register(h);
    }
    static final void cleanup() {
        //
        // Trigger a cleanup when the VM runs out of memory and starts clearing
        // soft references.
        //
        if ( == null) {
             = new WeakReferenceReaper<Object>(new Object()) {
                public void run() {
                     = null;
                    GC.trigger();
                }
            };
        }
    }
    static void disable() {
        .incrementAndGet();
    }
    static void enable() {
        if (.decrementAndGet() == 0) {
            cleanup();
        }
    }
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