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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) 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 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.ext.thread;
 
 import org.jruby.Ruby;
The "Mutex" class from the 'thread' library.
 
 @JRubyClass(name = "Mutex")
 public class Mutex extends RubyObject {
     ReentrantLock lock = new ReentrantLock();
 
     @JRubyMethod(name = "new", rest = true, meta = true)
     public static Mutex newInstance(ThreadContext contextIRubyObject recvIRubyObject[] argsBlock block) {
         Mutex result = new Mutex(context.runtime, (RubyClassrecv);
         result.callInit(contextargsblock);
         return result;
     }
 
     public Mutex(Ruby runtimeRubyClass type) {
         super(runtimetype);
     }
 
     public static void setup(Ruby runtime) {
         RubyClass cMutex = runtime.defineClass("Mutex"runtime.getObject(), new ObjectAllocator() {
 
             public IRubyObject allocate(Ruby runtimeRubyClass klass) {
                 return new Mutex(runtimeklass);
             }
         });
         cMutex.setReifiedClass(Mutex.class);
         cMutex.defineAnnotatedMethods(Mutex.class);
     }
 
     @JRubyMethod(name = "locked?")
     public synchronized RubyBoolean locked_p(ThreadContext context) {
         return context.runtime.newBoolean(.isLocked());
     }
 
     @JRubyMethod
     public RubyBoolean try_lock(ThreadContext context) {
         if (.isHeldByCurrentThread()) {
             return context.runtime.getFalse();
         }
         return context.runtime.newBoolean(context.getThread().tryLock());
     }
 
     @JRubyMethod
     public IRubyObject lock(ThreadContext context) {
         try {
             context.getThread().enterSleep();
             try {
                 checkRelocking(context);
                 context.getThread().lockInterruptibly();
             } catch (InterruptedException ex) {
                 context.pollThreadEvents();
                 throw context.runtime.newConcurrencyError("interrupted waiting for mutex: " + ex.getMessage());
             }
         } finally {
             context.getThread().exitSleep();
         }
         return this;
    }
    public synchronized IRubyObject unlock(ThreadContext context) {
        Ruby runtime = context.runtime;
        if (!.isLocked()) {
            throw runtime.newThreadError("Mutex is not locked");
        }
        if (!.isHeldByCurrentThread()) {
            throw runtime.newThreadError("Mutex is not owned by calling thread");
        }
        
        boolean hasQueued = .hasQueuedThreads();
        context.getThread().unlock();
        return hasQueued ? context.nil : this;
    }
    @JRubyMethod(compat = .)
    public IRubyObject sleep(ThreadContext context) {
        long beg = System.currentTimeMillis();
        try {
            unlock(context);
            context.getThread().sleep(-1);
        } catch (InterruptedException ex) {
            // ignore interrupted
        } finally {
            lock(context);
        }
        return context.runtime.newFixnum((System.currentTimeMillis() - beg) / 1000);
    }
    @JRubyMethod(compat = .)
    public IRubyObject sleep(ThreadContext contextIRubyObject timeout) {
        long beg = System.currentTimeMillis();
        try {
            unlock(context);
            context.getThread().sleep((long) (timeout.convertToFloat().getDoubleValue() * 1000));
        } catch (InterruptedException ex) {
            // ignore interrupted
        } finally {
            lock(context);
        }
        return context.runtime.newFixnum((System.currentTimeMillis() - beg) / 1000);
    }
    public IRubyObject synchronize(ThreadContext contextBlock block) {
        lock(context);
        try {
            return block.yield(contextnull);
        } finally {
            unlock(context);
        }
    }
    private void checkRelocking(ThreadContext context) {
        if (.isHeldByCurrentThread()) {
            throw context.runtime.newThreadError("Mutex relocking by same thread");
        }
    }
    
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