Add new Dart API call Dart_MakeIsolateRunnable(). This would allow an

runtime/include/dart_api.h

 // 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.
 
 #ifndef INCLUDE_DART_API_H_
 #define INCLUDE_DART_API_H_
 
 /** \mainpage Dart Embedding API Reference
  *
  * Dart is a class-based programming language for creating structured
@@ skipping 809 matching lines @@
  * 'isolate' does not execute any further Dart code, then the
  * interrupt will not occur at all.  If and when the isolate is
  * interrupted, the isolate interrupt callback will be invoked with
  * 'isolate' as the current isolate (see
  * Dart_IsolateInterruptCallback).
  *
  * \param isolate The isolate to be interrupted.
  */
 DART_EXPORT void Dart_InterruptIsolate(Dart_Isolate isolate);
 
+
+/**
+ * Make current isolate runnable.
+ *
+ * When isolates are spawned this function is used to indicate that
+ * the creation and initialization (including script loading) of the
+ * isolate is complete and the isolate can start running code.

[Ivan Posva, 2013/04/05 04:18:04]

It is not clear from this description whether the current isolate is exited as
part of this call. The issue is this: As soon as this call is made it is
possible for the thread pool to start dispatching messages. At this point the
thread calling Dart_MakeIsolateRunnable might not have exited the isolate yet.

How about:
bool Dart_IsolateMakeRunnable(Dart_Isolate isolate);

With the precondition being that the isolate is not entered when this call is
made.

+ */
+DART_EXPORT Dart_Handle Dart_MakeIsolateRunnable();
+
+
 // --- Messages and Ports ---
 
 /**
  * A port is used to send or receive inter-isolate messages
  */
 typedef int64_t Dart_Port;
 
 /**
  * ILLEGAL_PORT is a port number guaranteed never to be associated with a valid
  * port.
@@ skipping 1717 matching lines @@
  *
  * \param object An object.
  * \param peer A value to store in the peer field.
  *
  * \return Returns an error if 'object' is a subtype of Null, num, or
  *   bool.
  */
 DART_EXPORT Dart_Handle Dart_SetPeer(Dart_Handle object, void* peer);
 
 #endif  // INCLUDE_DART_API_H_