Add support for interrupting an isolate in the vm. Interrupts are

runtime/vm/dart.cc

 // Copyright (c) 2011, 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.
 
 #include "vm/dart.h"
 
 #include "vm/code_index_table.h"
 #include "vm/freelist.h"
 #include "vm/flags.h"
 #include "vm/handles.h"
 #include "vm/heap.h"
 #include "vm/isolate.h"
 #include "vm/longjump.h"
 #include "vm/object.h"
 #include "vm/object_store.h"
 #include "vm/port.h"
 #include "vm/snapshot.h"
 #include "vm/stub_code.h"
 #include "vm/virtual_memory.h"
 #include "vm/zone.h"
 
 namespace dart {
 
 Isolate* Dart::vm_isolate_ = NULL;
 DebugInfo* Dart::pprof_symbol_generator_ = NULL;
 
-bool Dart::InitOnce(Dart_IsolateCreateCallback callback) {
+bool Dart::InitOnce(Dart_IsolateCreateCallback create,
+                    Dart_IsolateInterruptCallback interrupt) {
   // TODO(iposva): Fix race condition here.
   if (vm_isolate_ != NULL || !Flags::Initialized()) {
     return false;
   }
   OS::InitOnce();
   VirtualMemory::InitOnce();
   Isolate::InitOnce();
   PortMap::InitOnce();
   FreeListElement::InitOnce();
   // Create the VM isolate and finish the VM initialization.
   {
     ASSERT(vm_isolate_ == NULL);
     ASSERT(Flags::Initialized());
     vm_isolate_ = Isolate::Init();
     Zone zone(vm_isolate_);
     HandleScope handle_scope(vm_isolate_);
     Heap::Init(vm_isolate_);
     ObjectStore::Init(vm_isolate_);
     Object::InitOnce();
     StubCode::InitOnce();
     Scanner::InitOnce();
   }
   Isolate::SetCurrent(NULL);  // Unregister the VM isolate from this thread.
-  Isolate::SetCreateCallback(callback);
+  Isolate::SetCreateCallback(create);
+  Isolate::SetInterruptCallback(interrupt);
   return true;
 }
 
 
 Isolate* Dart::CreateIsolate() {
   // Create a new isolate.
   Isolate* isolate = Isolate::Init();
   ASSERT(isolate != NULL);
   return isolate;
 }
@@ skipping 27 matching lines @@
 }
 
 
 void Dart::ShutdownIsolate() {
   Isolate* isolate = Isolate::Current();
   isolate->Shutdown();
   delete isolate;
 }
 
 }  // namespace dart