Quick-and-dirty fixes for on-demand snapshot.

src/api.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/api.h"
 
 #include <string.h>  // For memcpy, strlen.
 #ifdef V8_USE_ADDRESS_SANITIZER
 #include <sanitizer/asan_interface.h>
 #endif  // V8_USE_ADDRESS_SANITIZER
@@ skipping 194 matching lines @@
   i::V8::SetSnapshotBlob(snapshot_blob);
 }
 
 
 StartupData V8::CreateSnapshotDataBlob() {
   Isolate::CreateParams params;
   params.enable_serializer = true;
   Isolate* isolate = v8::Isolate::New(params);
   StartupData result = {NULL, 0};
   {
+    Locker locker(isolate);
     Isolate::Scope isolate_scope(isolate);
     i::Isolate* internal_isolate = reinterpret_cast<i::Isolate*>(isolate);
     Persistent<Context> context;
     {
       HandleScope handle_scope(isolate);
       context.Reset(isolate, Context::New(isolate));
     }
     if (!context.IsEmpty()) {
       // Make sure all builtin scripts are cached.
       {
@@ skipping 7529 matching lines @@
   Isolate* isolate = reinterpret_cast<Isolate*>(info.GetIsolate());
   Address callback_address =
       reinterpret_cast<Address>(reinterpret_cast<intptr_t>(callback));
   VMState<EXTERNAL> state(isolate);
   ExternalCallbackScope call_scope(isolate, callback_address);
   callback(info);
 }
 
 
 } }  // namespace v8::internal