Implement safepointing of threads

runtime/vm/custom_isolate_test.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 "include/dart_api.h"
 #include "include/dart_native_api.h"
 
 #include "vm/unit_test.h"
 
 // Custom Isolate Test.
@@ skipping 212 matching lines @@
   OS::Print("-- Notify isolate(%p) of pending message --\n", dest_isolate);
   OS::Print("-- Adding MessageEvent to queue --\n");
   event_queue->Add(new MessageEvent(dest_isolate));
 }
 
 
 static Dart_NativeFunction NativeLookup(Dart_Handle name,
                                         int argc,
                                         bool* auto_setup_scope) {
   ASSERT(auto_setup_scope != NULL);
-  *auto_setup_scope = false;
+  *auto_setup_scope = true;
   const char* name_str = NULL;
   EXPECT(Dart_IsString(name));
   EXPECT_VALID(Dart_StringToCString(name, &name_str));
   if (strcmp(name_str, "native_echo") == 0) {
     return &native_echo;
   } else if (strcmp(name_str, "CustomIsolateImpl_start") == 0) {
     return &CustomIsolateImpl_start;
   }
   return NULL;
 }
@@ skipping 106 matching lines @@
   }
   OS::Print("-- Finished event loop --\n");
   EXPECT_STREQ("Received: 43", saved_echo);
   free(saved_echo);
 
   delete event_queue;
   event_queue = NULL;
 }
 
 }  // namespace dart