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BEGIN LICENSE BLOCK ***** Version: CPL 1.0/GPL 2.0/LGPL 2.1 The contents of this file are subject to the Common 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/cpl-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) 2006 MenTaLguY <mental@rydia.net> 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 CPL, 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 CPL, the GPL or the LGPL. END LICENSE BLOCK ***
 
 package org.jruby.ext.thread;
 
 import org.jruby.Ruby;
The "Queue" class from the 'thread' library.
 
 @JRubyClass(name = "Queue")
 public class Queue extends RubyObject {
     private LinkedList entries;
     protected volatile int numWaiting = 0;
 
     @JRubyMethod(name = "new", rest = true, meta = true)
     public static IRubyObject newInstance(ThreadContext contextIRubyObject recvIRubyObject[] argsBlock block) {
         Queue result = new Queue(context.runtime, (RubyClassrecv);
         result.callInit(contextargsblock);
         return result;
     }
 
     public Queue(Ruby runtimeRubyClass type) {
         super(runtimetype);
          = new LinkedList();
     }
 
     public static void setup(Ruby runtime) {
         RubyClass cQueue = runtime.defineClass("Queue"runtime.getObject(), new ObjectAllocator() {
 
             public IRubyObject allocate(Ruby runtimeRubyClass klass) {
                 return new Queue(runtimeklass);
             }
         });
         cQueue.setReifiedClass(Queue.class);
         cQueue.defineAnnotatedMethods(Queue.class);
     }
 
     @JRubyMethod(name = "shutdown!")
     public synchronized IRubyObject shutdown(ThreadContext context) {
          = null;
         notifyAll();
         return context.runtime.getNil();
     }
 
     public synchronized void checkShutdown(ThreadContext context) {
         if ( == null) {
             throw new RaiseException(context.runtimecontext.runtime.getThreadError(), "queue shut down"false);
         }
     }
 
     @JRubyMethod
     public synchronized IRubyObject clear(ThreadContext context) {
         checkShutdown(context);
         .clear();
         return context.runtime.getNil();
     }
 
     @JRubyMethod(name = "empty?")
     public synchronized RubyBoolean empty_p(ThreadContext context) {
         checkShutdown(context);
         return context.runtime.newBoolean(.size() == 0);
     }
    @JRubyMethod(name = {"length""size"})
    public synchronized RubyNumeric length(ThreadContext context) {
        checkShutdown(context);
        return RubyNumeric.int2fix(context.runtime.size());
    }
    protected synchronized long java_length() {
        return .size();
    }
    public RubyNumeric num_waiting(ThreadContext context) {
        return context.runtime.newFixnum();
    }
    @JRubyMethod(name = {"pop""deq""shift"})
    public synchronized IRubyObject pop(ThreadContext context) {
        return pop(contexttrue);
    }
    @JRubyMethod(name = {"pop""deq""shift"})
    public synchronized IRubyObject pop(ThreadContext contextIRubyObject arg0) {
        return pop(context, !arg0.isTrue());
    }
    @JRubyMethod(name = {"push""<<""enq"})
    public synchronized IRubyObject push(ThreadContext contextIRubyObject value) {
        checkShutdown(context);
        .addLast(value);
        notify();
        return context.runtime.getNil();
    }
    private synchronized IRubyObject pop(ThreadContext contextboolean should_block) {
        checkShutdown(context);
        if (!should_block && .size() == 0) {
            throw new RaiseException(context.runtimecontext.runtime.getThreadError(), "queue empty"false);
        }
        ++;
        try {
            while (java_length() == 0) {
                try {
                    context.getThread().wait_timeout(thisnull);
                } catch (InterruptedException e) {
                }
                checkShutdown(context);
            }
        } finally {
            --;
        }
        return (IRubyObject.removeFirst();
    }
    
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