Most of the elements are in place for monitors to work... something is wrong tough because I get errors when I try to compile files with synchronized sections.

teavm-classlib/src/main/java/org/teavm/classlib/java/lang/TObject.java

@@ -29,6 +29,39 @@ import org.teavm.runtime.Async;
  */
 @Superclass("")
 public class TObject {
+    
+    private TThread owner;
+    private TObject monitorLock;
+    private int monitorCount=0;
+    
+    static void monitorEnter(TObject o){
+        if ( o.monitorLock == null ){
+            o.monitorLock = new TObject();
+        }
+        while (o.owner != null && o.owner != TThread.currentThread() ){
+            try {
+                o.monitorLock.wait();
+            } catch (InterruptedException ex) {
+                
+            }
+        }
+        o.owner = TThread.currentThread();
+        o.monitorCount++;
+        
+    }
+    
+    static void monitorExit(TObject o){
+        o.owner = null;
+        o.monitorCount--;
+        if ( o.monitorLock != null ){
+            o.monitorLock.notifyAll();
+        }
+    }
+    
+    static boolean holdsLock(TObject o){
+        return o.owner == TThread.currentThread();
+    }
+    
     @Rename("fakeInit")
     public TObject() {
     }

teavm-classlib/src/main/java/org/teavm/classlib/java/lang/TThread.java

@@ -112,8 +112,8 @@ public class TThread extends TObject implements TRunnable {
         return id;
     }
 
-    public static boolean holdsLock(@SuppressWarnings("unused") TObject obj) {
-        return true;
+    public static boolean holdsLock(TObject obj) {
+        return TObject.holdsLock(obj);
     }
 
     public static void sleep(long millis) throws TInterruptedException {
@@ -123,4 +123,6 @@ public class TThread extends TObject implements TRunnable {
     @Async
     @GeneratedBy(ThreadNativeGenerator.class)
     private static native void sleep(double millis) throws TInterruptedException;
+    
+    
 }

teavm-core/src/main/java/org/teavm/cache/AstIO.java

@@ -508,6 +508,16 @@ public class AstIO {
                 throw new IOExceptionWrapper(e);
             }
         }
+
+        @Override
+        public void visit(MonitorEnterStatement statement) {
+            
+        }
+
+        @Override
+        public void visit(MonitorExitStatement statement) {
+            
+        }
     }
 
     private NodeLocation readLocation(DataInput input) throws IOException {

teavm-core/src/main/java/org/teavm/cache/DiskRegularMethodNodeCache.java

@@ -261,6 +261,16 @@ public class DiskRegularMethodNodeCache implements RegularMethodNodeCache {
         @Override
         public void visit(RestoreAsyncStatement statement) {
         }
+
+        @Override
+        public void visit(MonitorEnterStatement statement) {
+            
+        }
+
+        @Override
+        public void visit(MonitorExitStatement statement) {
+            
+        }
     }
 
     static class Item {

teavm-core/src/main/java/org/teavm/javascript/BreakToContinueReplacer.java

@@ -116,4 +116,14 @@ class BreakToContinueReplacer implements StatementVisitor {
     @Override
     public void visit(RestoreAsyncStatement statement) {
     }
+
+    @Override
+    public void visit(MonitorEnterStatement statement) {
+        
+    }
+
+    @Override
+    public void visit(MonitorExitStatement statement) {
+        
+    }
 }

teavm-core/src/main/java/org/teavm/javascript/CertainBlockCountVisitor.java

@@ -111,4 +111,14 @@ class CertainBlockCountVisitor implements StatementVisitor {
     @Override
     public void visit(RestoreAsyncStatement statement) {
     }
+
+    @Override
+    public void visit(MonitorEnterStatement statement) {
+        
+    }
+
+    @Override
+    public void visit(MonitorExitStatement statement) {
+        
+    }
 }

teavm-core/src/main/java/org/teavm/javascript/OptimizingVisitor.java

@@ -618,4 +618,14 @@ class OptimizingVisitor implements StatementVisitor, ExprVisitor {
     public void visit(RestoreAsyncStatement statement) {
         resultStmt = statement;
     }
+
+    @Override
+    public void visit(MonitorEnterStatement statement) {
+        resultStmt = statement;
+    }
+
+    @Override
+    public void visit(MonitorExitStatement statement) {
+        resultStmt = statement;
+    }
 }

teavm-core/src/main/java/org/teavm/javascript/RedundantLabelEliminator.java

@@ -121,4 +121,14 @@ class RedundantLabelEliminator implements StatementVisitor {
     @Override
     public void visit(RestoreAsyncStatement statement) {
     }
+
+    @Override
+    public void visit(MonitorEnterStatement statement) {
+        
+    }
+
+    @Override
+    public void visit(MonitorExitStatement statement) {
+        
+    }
 }

teavm-core/src/main/java/org/teavm/javascript/ReferenceCountingVisitor.java

@@ -115,4 +115,14 @@ class ReferenceCountingVisitor implements StatementVisitor {
     @Override
     public void visit(RestoreAsyncStatement statement) {
     }
+
+    @Override
+    public void visit(MonitorEnterStatement statement) {
+        
+    }
+
+    @Override
+    public void visit(MonitorExitStatement statement) {
+        
+    }
 }

teavm-core/src/main/java/org/teavm/javascript/Renderer.java

@@ -55,6 +55,40 @@ public class Renderer implements ExprVisitor, StatementVisitor, RenderingContext
     private DeferredCallSite prevCallSite;
     private boolean async;
 
+    @Override
+    public void visit(MonitorEnterStatement statement) {
+        if (async){
+            try {
+                MethodReference monitorEnterRef = new MethodReference(
+                        Object.class, "monitorEnter", Object.class, void.class);
+                
+                writer.appendMethodBody(monitorEnterRef).append("(");
+                statement.acceptVisitor(this);
+                writer.append(");").softNewLine();
+                
+            } catch (IOException ex){
+                throw new RenderingException("IO error occured", ex);
+            }
+        }
+    }
+
+    @Override
+    public void visit(MonitorExitStatement statement) {
+        if (async){
+            try {
+                MethodReference monitorExitRef = new MethodReference(
+                        Object.class, "monitorExit", Object.class, void.class);
+
+                writer.appendMethodBody(monitorExitRef).append("(");
+                statement.acceptVisitor(this);
+                writer.append(");").softNewLine();
+            } catch (IOException ex){
+                throw new RenderingException("IO error occured", ex);
+            }
+                
+        }
+    }
+
     private static class InjectorHolder {
         public final Injector injector;
 

teavm-core/src/main/java/org/teavm/javascript/StatementGenerator.java

@@ -670,10 +670,24 @@ class StatementGenerator implements InstructionVisitor {
     @Override
     public void visit(MonitorEnterInstruction insn) {
         
+        MonitorEnterStatement stmt = new MonitorEnterStatement();
+        stmt.setLocation(currentLocation);
+        
+        VariableExpr expr = new VariableExpr();
+        expr.setIndex(insn.getObjectRef().getIndex());
+        expr.setLocation(currentLocation);
+        stmt.setObjectRef(expr);
+        statements.add(stmt);
     }
 
     @Override
     public void visit(MonitorExitInstruction insn) {
-        
+        MonitorExitStatement stmt = new MonitorExitStatement();
+        stmt.setLocation(currentLocation);
+        VariableExpr expr = new VariableExpr();
+        expr.setLocation(currentLocation);
+        expr.setIndex(insn.getObjectRef().getIndex());
+        stmt.setObjectRef(expr);
+        statements.add(stmt);
     }
 }

teavm-core/src/main/java/org/teavm/javascript/TryCatchFinder.java

@@ -114,4 +114,14 @@ class TryCatchFinder implements StatementVisitor {
     @Override
     public void visit(RestoreAsyncStatement statement) {
     }
+
+    @Override
+    public void visit(MonitorEnterStatement statement) {
+        
+    }
+
+    @Override
+    public void visit(MonitorExitStatement statement) {
+        
+    }
 }

teavm-core/src/main/java/org/teavm/javascript/UnusedVariableEliminator.java

@@ -228,4 +228,14 @@ class UnusedVariableEliminator implements ExprVisitor, StatementVisitor {
     @Override
     public void visit(RestoreAsyncStatement statement) {
     }
+
+    @Override
+    public void visit(MonitorEnterStatement statement) {
+        
+    }
+
+    @Override
+    public void visit(MonitorExitStatement statement) {
+        
+    }
 }

teavm-core/src/main/java/org/teavm/javascript/ast/MonitorEnterStatement.java

@@ -0,0 +1,60 @@
+/*
+ *  Copyright 2015 Alexey Andreev.
+ *
+ *  Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+package org.teavm.javascript.ast;
+
+/**
+ *
+ * @author shannah
+ */
+public class MonitorEnterStatement extends Statement {
+    
+    private NodeLocation location;
+    private VariableExpr objectRef;
+
+    @Override
+    public void acceptVisitor(StatementVisitor visitor) {
+        visitor.visit(this);
+    }
+
+    /**
+     * @return the location
+     */
+    public NodeLocation getLocation() {
+        return location;
+    }
+
+    /**
+     * @param location the location to set
+     */
+    public void setLocation(NodeLocation location) {
+        this.location = location;
+    }
+
+    /**
+     * @return the objectRef
+     */
+    public VariableExpr getObjectRef() {
+        return objectRef;
+    }
+
+    /**
+     * @param objectRef the objectRef to set
+     */
+    public void setObjectRef(VariableExpr objectRef) {
+        this.objectRef = objectRef;
+    }
+    
+}

teavm-core/src/main/java/org/teavm/javascript/ast/MonitorExitStatement.java

@@ -0,0 +1,60 @@
+/*
+ *  Copyright 2015 Alexey Andreev.
+ *
+ *  Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+package org.teavm.javascript.ast;
+
+/**
+ *
+ * @author shannah
+ */
+public class MonitorExitStatement extends Statement {
+
+    private NodeLocation location;
+    private VariableExpr objectRef;
+    
+    @Override
+    public void acceptVisitor(StatementVisitor visitor) {
+        visitor.visit(this);
+    }
+
+    /**
+     * @return the location
+     */
+    public NodeLocation getLocation() {
+        return location;
+    }
+
+    /**
+     * @param location the location to set
+     */
+    public void setLocation(NodeLocation location) {
+        this.location = location;
+    }
+
+    /**
+     * @return the objectRef
+     */
+    public VariableExpr getObjectRef() {
+        return objectRef;
+    }
+
+    /**
+     * @param objectRef the objectRef to set
+     */
+    public void setObjectRef(VariableExpr objectRef) {
+        this.objectRef = objectRef;
+    }
+    
+}

teavm-core/src/main/java/org/teavm/javascript/ast/RenamingVisitor.java

@@ -198,4 +198,14 @@ public class RenamingVisitor implements StatementVisitor, ExprVisitor {
             statement.setReceiver(varNames[statement.getReceiver()]);
         }
     }
+
+    @Override
+    public void visit(MonitorEnterStatement statement) {
+        
+    }
+
+    @Override
+    public void visit(MonitorExitStatement statement) {
+        
+    }
 }

teavm-core/src/main/java/org/teavm/javascript/ast/StatementVisitor.java

@@ -45,4 +45,8 @@ public interface StatementVisitor {
     void visit(TryCatchStatement statement);
 
     void visit(RestoreAsyncStatement statement);
+    
+    void visit(MonitorEnterStatement statement);
+    
+    void visit(MonitorExitStatement statement);
 }

teavm-core/src/main/java/org/teavm/model/BasicBlock.java

@@ -16,6 +16,7 @@
 package org.teavm.model;
 
 import java.util.*;
+import org.teavm.model.instructions.AssignInstruction;
 import org.teavm.model.instructions.InstructionReader;
 
 /**
@@ -66,7 +67,19 @@ public class BasicBlock implements BasicBlockReader {
         @Override
         public void add(int index, Instruction e) {
             if (e.getBasicBlock() != null) {
-                throw new IllegalArgumentException("This instruction is in some basic block");
+                if (e instanceof AssignInstruction){
+                    AssignInstruction ae = (AssignInstruction)e;
+                    System.out.println("Assignment "+ae.getReceiver()+" -> "+ae.getAssignee());
+                    System.out.println(ae.getReceiver().getDebugNames());
+                    System.out.println(ae.getReceiver().getIndex());
+                    System.out.println(ae.getReceiver().getProgram());
+                    System.out.println(ae.getAssignee().getDebugNames());
+                    System.out.println(ae.getAssignee().getIndex());
+                    System.out.println(ae.getAssignee().getProgram());
+                    
+                    System.out.println(ae.getBasicBlock().getInstructions());
+                }
+                throw new IllegalArgumentException("This instruction is in some basic block "+e+", "+e.getLocation());
             }
             e.setBasicBlock(BasicBlock.this);
             instructions.add(index, e);

teavm-core/src/main/java/org/teavm/model/util/InstructionVariableMapper.java

@@ -231,12 +231,12 @@ public abstract class InstructionVariableMapper implements InstructionVisitor {
 
     @Override
     public void visit(MonitorEnterInstruction insn) {
-        
+        insn.setObjectRef(map(insn.getObjectRef()));
     }
 
     @Override
     public void visit(MonitorExitInstruction insn) {
-        
+        insn.setObjectRef(map(insn.getObjectRef()));
     }
     
     

teavm-core/src/main/java/org/teavm/optimization/GlobalValueNumbering.java

@@ -421,12 +421,14 @@ public class GlobalValueNumbering implements MethodOptimization {
 
         @Override
         public void visit(MonitorEnterInstruction insn) {
-            
+            int val = map[insn.getObjectRef().getIndex()];
+            insn.setObjectRef(program.variableAt(val));
         }
 
         @Override
         public void visit(MonitorExitInstruction insn) {
-            
+            int val = map[insn.getObjectRef().getIndex()];
+            insn.setObjectRef(program.variableAt(val));
         }
     };
 }

teavm-core/src/main/java/org/teavm/parsing/ProgramParser.java

@@ -1556,11 +1556,20 @@ public class ProgramParser implements VariableDebugInformation {
                     nextIndexes = new int[0];
                     return;
                 }
-                case Opcodes.MONITORENTER:
-                case Opcodes.MONITOREXIT:
-                    popSingle();
+                case Opcodes.MONITORENTER: {
+                    MonitorEnterInstruction insn = new MonitorEnterInstruction();
+                    insn.setObjectRef(getVariable(popSingle()));
+                    addInstruction(insn);
                     break;
                 }
+                case Opcodes.MONITOREXIT: {
+                    MonitorExitInstruction insn = new MonitorExitInstruction();
+                    insn.setObjectRef(getVariable(popSingle()));
+                    addInstruction(insn);
+                    break;
+                }
+                    
+            }
         }
 
         @Override

teavm-core/src/main/java/org/teavm/parsing/SSATransformer.java

@@ -450,12 +450,12 @@ public class SSATransformer {
 
         @Override
         public void visit(MonitorEnterInstruction insn) {
-            
+            insn.setObjectRef(use(insn.getObjectRef()));
         }
 
         @Override
         public void visit(MonitorExitInstruction insn) {
-            
+            insn.setObjectRef(use(insn.getObjectRef()));
         }
     };
 }

teavm-samples/teavm-samples-async/nb-configuration.xml

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project-shared-configuration>
+    <!--
+This file contains additional configuration written by modules in the NetBeans IDE.
+The configuration is intended to be shared among all the users of project and
+therefore it is assumed to be part of version control checkout.
+Without this configuration present, some functionality in the IDE may be limited or fail altogether.
+-->
+    <properties xmlns="http://www.netbeans.org/ns/maven-properties-data/1">
+        <!--
+Properties that influence various parts of the IDE, especially code formatting and the like. 
+You can copy and paste the single properties, into the pom.xml file and the IDE will pick them up.
+That way multiple projects can share the same settings (useful for formatting rules for example).
+Any value defined here will override the pom.xml file value but is only applicable to the current project.
+-->
+        <ca-weblite-netbeans-mirah.project_5f_type>maven</ca-weblite-netbeans-mirah.project_5f_type>
+        <org-netbeans-modules-maven-j2ee.netbeans_2e_hint_2e_deploy_2e_server>gfv3ee6</org-netbeans-modules-maven-j2ee.netbeans_2e_hint_2e_deploy_2e_server>
+    </properties>
+</project-shared-configuration>

teavm-samples/teavm-samples-async/nbactions.xml

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<actions>
+        <action>
+            <actionName>build</actionName>
+            <packagings>
+                <packaging>*</packaging>
+            </packagings>
+            <goals>
+                <goal>install</goal>
+            </goals>
+            <properties>
+                <skipTests>true</skipTests>
+                <jpda.listen>maven</jpda.listen>
+                
+            </properties>
+        </action>
+    </actions>

teavm-samples/teavm-samples-async/src/main/java/org/teavm/samples/async/AsyncProgram.java

@@ -48,6 +48,20 @@ public final class AsyncProgram {
             
         }, "Test Thread");
         t.start();
+        
+        Thread t2 = new Thread(new Runnable(){
+
+            @Override
+            public void run() {
+                try {
+                    doRun(lock);
+                } catch (InterruptedException ex){
+                    System.out.println(ex.getMessage());
+                }
+            }
+            
+        }, "Test Thread 2");
+        t2.start();
         System.out.println("Should be main -> Current thread is "+Thread.currentThread().getName());   
         System.out.println("Now trying wait...");
         
@@ -68,6 +82,12 @@ public final class AsyncProgram {
         Thread.sleep(5000);
         System.out.println("Current thread is "+Thread.currentThread().getName());
         System.out.println("Finished another 5 second sleep");
+        
+        synchronized(lock){
+            System.out.println("Inside locked section of thread "+Thread.currentThread().getName());
+            Thread.sleep(2000);
+            System.out.println("Finished locked section of thread "+Thread.currentThread().getName());
+        }
     }
     
     private static void withoutAsync() {
@@ -113,4 +133,6 @@ public final class AsyncProgram {
         System.out.println("Thread.yield called");
         throw new IllegalStateException();
     }
+    
+    
 }