Very simple version of Isolates.

tests/standalone/typed_array_test.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 //
 // Dart test program for testing native float and int arrays.  64-bit int arrays
 // are in a separate test.
 
 // Library tag to be able to run in html test framework.
 library TypedArray;
 import "package:expect/expect.dart";
@@ skipping 15 matching lines @@
 // Int8 array.
 Int8List initInt8() {
   var int8 = new Int8List(2);
   int8[0] = 10;
   int8[1] = 100;
   return int8;
 }
 Int8List int8 = initInt8();
 
 void int8_receiver() {
-  var sp = spawnFunction(int8_sender);
-  sp.call(int8.length).then((a) {
+  var response = new ReceivePort();
+  var remote = Isolate.spawn(int8_sender, [int8.length, response.sendPort]);
+  response.first.then((a) {
     Expect.equals(int8.length, a.length);
     for (int i = 0; i < a.length; i++) {
       Expect.equals(int8[i], a[i]);
     }
     print("int8_receiver");
   });
 }
 
-int8_sender() {
-  port.receive((len, r) {
-    Expect.equals(int8.length, len);
-    var a = new Int8List(len);
-    for (int i = 0; i < len; i++) {
-      a[i] = int8[i];
-    }
-    r.send(a);
-  });
+int8_sender(message) {
+  var len = message[0];
+  var r = message[1];
+  Expect.equals(int8.length, len);
+  var a = new Int8List(len);
+  for (int i = 0; i < len; i++) {
+    a[i] = int8[i];
+  }
+  r.send(a);
 }
 
 
 // Uint8 array.
 Uint8List initUint8() {
   var uint8 = new Uint8List(2);
   uint8[0] = 0xff;
   uint8[1] = 0x7f;
   return uint8;
 }
 Uint8List uint8 = initUint8();
 
 void uint8_receiver() {
-  var sp = spawnFunction(uint8_sender);
-  sp.call(uint8.length).then((a) {
+  var response = new ReceivePort();
+  var remote = Isolate.spawn(uint8_sender, [uint8.length, response.sendPort]);
+  response.first.then((a) {
     Expect.equals(uint8.length, a.length);
     for (int i = 0; i < a.length; i++) {
       Expect.equals(uint8[i], a[i]);
     }
     print("uint8_receiver");
   });
 }
 
-uint8_sender() {
-  port.receive((len, r) {
-    Expect.equals(uint8.length, len);
-    var a = new Uint8List(len);
-    for (int i = 0; i < len; i++) {
-      a[i] = uint8[i];
-    }
-    r.send(a);
-  });
+uint8_sender(message) {
+  var len = message[0];
+  var r = message[1];
+  Expect.equals(uint8.length, len);
+  var a = new Uint8List(len);
+  for (int i = 0; i < len; i++) {
+    a[i] = uint8[i];
+  }
+  r.send(a);
 }
 
 
 // Int16 array.
 Int16List initInt16() {
   var int16 = new Int16List(2);
   int16[0] = 1000;
   int16[1] = 10000;
   return int16;
 }
 Int16List int16 = initInt16();
 
 void int16_receiver() {
-  var sp = spawnFunction(int16_sender);
-  sp.call(int16.length).then((a) {
+  var response = new ReceivePort();
+  var remote = Isolate.spawn(int16_sender, [int16.length, response.sendPort]);
+  response.first.then((a) {
     Expect.equals(int16.length, a.length);
     for (int i = 0; i < a.length; i++) {
       Expect.equals(int16[i], a[i]);
     }
     print("int16_receiver");
   });
 }
 
-int16_sender() {
-  port.receive((len, r) {
-    Expect.equals(int16.length, len);
-    var a = new Int16List(len);
-    for (int i = 0; i < len; i++) {
-      a[i] = int16[i];
-    }
-    r.send(a);
-  });
+int16_sender(message) {
+  var len = message[0];
+  var r = message[1];
+  Expect.equals(int16.length, len);
+  var a = new Int16List(len);
+  for (int i = 0; i < len; i++) {
+    a[i] = int16[i];
+  }
+  r.send(a);
 }
 
 
 // Uint16 array.
 Uint16List initUint16() {
   var uint16 = new Uint16List(2);
   uint16[0] = 0xffff;
   uint16[1] = 0x7fff;
   return uint16;
 }
 Uint16List uint16 = initUint16();
 
 void uint16_receiver() {
-  var sp = spawnFunction(uint16_sender);
-  sp.call(uint16.length).then((a) {
+  var response = new ReceivePort();
+  var remote = Isolate.spawn(uint16_sender, [uint16.length, response.sendPort]);
+  response.first.then((a) {
     Expect.equals(uint16.length, a.length);
     for (int i = 0; i < a.length; i++) {
       Expect.equals(uint16[i], a[i]);
     }
     print("uint16_receiver");
   });
 }
 
-uint16_sender() {
-  port.receive((len, r) {
-    Expect.equals(uint16.length, len);
-    var a = new Uint16List(len);
-    for (int i = 0; i < len; i++) {
-      a[i] = uint16[i];
-    }
-    r.send(a);
-  });
+uint16_sender(message) {
+  var len = message[0];
+  var r = message[1];
+  Expect.equals(uint16.length, len);
+  var a = new Uint16List(len);
+  for (int i = 0; i < len; i++) {
+    a[i] = uint16[i];
+  }
+  r.send(a);
 }
 
 
 // Int32 array.
 Int32List initInt32() {
   var int32 = new Int32List(2);
   int32[0] = 100000;
   int32[1] = 1000000;
   return int32;
 }
 Int32List int32 = initInt32();
 
 void int32_receiver() {
-  var sp = spawnFunction(int32_sender);
-  sp.call(int32.length).then((a) {
+  var response = new ReceivePort();
+  var remote = Isolate.spawn(int32_sender, [int32.length, response.sendPort]);
+  response.first.then((a) {
     Expect.equals(int32.length, a.length);
     for (int i = 0; i < a.length; i++) {
       Expect.equals(int32[i], a[i]);
     }
     print("int32_receiver");
   });
 }
 
-int32_sender() {
-  port.receive((len, r) {
-    Expect.equals(int32.length, len);
-    var a = new Int32List(len);
-    for (int i = 0; i < len; i++) {
-      a[i] = int32[i];
-    }
-    r.send(a);
-  });
+int32_sender(message) {
+  var len = message[0];
+  var r = message[1];
+  Expect.equals(int32.length, len);
+  var a = new Int32List(len);
+  for (int i = 0; i < len; i++) {
+    a[i] = int32[i];
+  }
+  r.send(a);
 }
 
 
 // Uint32 array.
 Uint32List initUint32() {
   var uint32 = new Uint32List(2);
   uint32[0] = 0xffffffff;
   uint32[1] = 0x7fffffff;
   return uint32;
 }
 Uint32List uint32 = initUint32();
 
 void uint32_receiver() {
-  var sp = spawnFunction(uint32_sender);
-  sp.call(uint32.length).then((a) {
+  var response = new ReceivePort();
+  var remote = Isolate.spawn(uint32_sender, [uint32.length, response.sendPort]);
+  response.first.then((a) {
     Expect.equals(uint32.length, a.length);
     for (int i = 0; i < a.length; i++) {
       Expect.equals(uint32[i], a[i]);
     }
     print("uint32_receiver");
   });
 }
 
-uint32_sender() {
-  port.receive((len, r) {
-    Expect.equals(uint32.length, len);
-    var a = new Uint32List(len);
-    for (int i = 0; i < len; i++) {
-      a[i] = uint32[i];
-    }
-    r.send(a);
-  });
+uint32_sender(message) {
+  var len = message[0];
+  var r = message[1];
+  Expect.equals(uint32.length, len);
+  var a = new Uint32List(len);
+  for (int i = 0; i < len; i++) {
+    a[i] = uint32[i];
+  }
+  r.send(a);
 }
 
 
 // Float32 Array.
 Float32List initFloat32() {
   var float32 = new Float32List(2);
   float32[0] = 1.0;
   float32[1] = 2.0;
   return float32;
 }
 Float32List float32 = initFloat32();
 
 void float32_receiver() {
-  var sp = spawnFunction(float32_sender);
-  sp.call(float32.length).then((a) {
+  var response = new ReceivePort();
+  var remote =
+      Isolate.spawn(float32_sender, [float32.length, response.sendPort]);
+  response.first.then((a) {
     Expect.equals(float32.length, a.length);
     for (int i = 0; i < a.length; i++) {
       Expect.equals(float32[i], a[i]);
     }
     print("float32_receiver");
   });
 }
 
-float32_sender() {
-  port.receive((len, r) {
-    Expect.equals(float32.length, len);
-    var a = new Float32List(len);
-    for (int i = 0; i < len; i++) {
-      a[i] = float32[i];
-    }
-    r.send(a);
-  });
+float32_sender(message) {
+  var len = message[0];
+  var r = message[1];
+  Expect.equals(float32.length, len);
+  var a = new Float32List(len);
+  for (int i = 0; i < len; i++) {
+    a[i] = float32[i];
+  }
+  r.send(a);
 }
 
 
 // Float64 Array.
 Float64List initFloat64() {
   var float64 = new Float64List(2);
   float64[0] = 101.234;
   float64[1] = 201.765;
   return float64;
 }
 Float64List float64 = initFloat64();
 
 void float64_receiver() {
-  var sp = spawnFunction(float64_sender);
-  sp.call(float64.length).then((a) {
+  var response = new ReceivePort();
+  var remote =
+      Isolate.spawn(float64_sender, [float64.length, response.sendPort]);
+  response.first.then((a) {
     Expect.equals(float64.length, a.length);
     for (int i = 0; i < a.length; i++) {
       Expect.equals(float64[i], a[i]);
     }
     print("float64_receiver");
   });
 }
 
-float64_sender() {
-  port.receive((len, r) {
-    Expect.equals(float64.length, len);
-    var a = new Float64List(len);
-    for (int i = 0; i < len; i++) {
-      a[i] = float64[i];
-    }
-    r.send(a);
-  });
+float64_sender(message) {
+  var len = message[0];
+  var r = message[1];
+  Expect.equals(float64.length, len);
+  var a = new Float64List(len);
+  for (int i = 0; i < len; i++) {
+    a[i] = float64[i];
+  }
+  r.send(a);
 }