Stream isolates.

sdk/lib/isolate/base.dart

Index: sdk/lib/isolate/base.dart
diff --git a/sdk/lib/isolate/base.dart b/sdk/lib/isolate/base.dart
index e43e3bbe9b0986ed4c208b6045c07cf861b58c73..a649ab907f85d060df5873dd96401d68d47be16b 100644
--- a/sdk/lib/isolate/base.dart
+++ b/sdk/lib/isolate/base.dart
@@ -14,7 +14,7 @@ class IsolateSpawnException implements Exception {
  * the first communication between isolates (see [spawnFunction] and
  * [spawnUri]).
  */
-external ReceivePort get port;
+ReceivePort get port => _Isolate.port;
 
 /**
  * Creates and spawns an isolate that shares the same code as the current
@@ -31,8 +31,8 @@ external ReceivePort get port;
  *
  * See comments at the top of this library for more details.
  */
-// Note this feature is not yet available in the dartvm.
-external SendPort spawnFunction(void topLevelFunction());
+SendPort spawnFunction(void topLevelFunction())
+    => _Isolate.spawnFunction(topLevelFunction);
 
 /**
  * Creates and spawns an isolate whose code is available at [uri].  Like with
@@ -41,7 +41,7 @@ external SendPort spawnFunction(void topLevelFunction());
  *
  * See comments at the top of this library for more details.
  */
-external SendPort spawnUri(String uri);
+SendPort spawnUri(String uri) => _Isolate.spawnUri(uri);
 
 /**
  * [SendPort]s are created from [ReceivePort]s. Any message sent through
@@ -142,3 +142,12 @@ abstract class SendPortSync {
   callSync(var message);
 
 }
+
+// The VM doesn't support accessing external globals in the same library. We

[Ivan Posva, 2012/11/26 18:56:40]

Can you please elaborate what is missing from our tests? There should be no
reason to not be able to access external from the library.

[floitsch, 2012/11/28 14:13:18]

We cannot access external global variables from within the same library. The VM
will just not see it.
You can test this by adding a ReceivePort get port2 => port in the original code
and try to access it (after having imported dart:async).
Filed issue 6997 and updated TODO with bug-number.

+// therefore create this wrapper class.
+// TODO(floitsch): add bug-number.
+abstract class _Isolate {
+  external static ReceivePort get port;
+  external static SendPort spawnFunction(void topLevelFunction());
+  external static SendPort spawnUri(String uri);
+}