V8 Microtask Queue & API

src/api.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 6275 matching lines @@
       callback);
 }
 
 
 void V8::AddCallCompletedCallback(CallCompletedCallback callback) {
   if (callback == NULL) return;
   i::V8::AddCallCompletedCallback(callback);
 }
 
 
+void V8::RunMicrotasks(Isolate* isolate) {
+  i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
+  i::HandleScope scope(i_isolate);
+  i::V8::RunMicrotasks(i_isolate);
+}
+
+
+static void ExternalMicrotaskFunctionCallback(
+    const v8::FunctionCallbackInfo<Value>& info) {
+  STATIC_ASSERT(
+      sizeof(ExternalMicrotaskCallback) == sizeof(v8::internal::Address));
+  ExternalMicrotaskCallback callback =
+      reinterpret_cast<ExternalMicrotaskCallback>(reinterpret_cast<intptr_t>(
+          info.Data().As<External>()->Value()));
+  (*callback)(info.GetIsolate());
+}
+
+
+void V8::EnqueueExternalMicrotask(Isolate* isolate,
+                                  ExternalMicrotaskCallback callback) {

[dcarney, 2014/02/11 07:47:13]

No need for a new ExternalMicrotaskCallback type: just use Handle<Function> here
as the second argument.
Also, I don't see a reason to call all these things ExternalMicrotask
everywhere, just Microtask is maybe better.

[rafaelw, 2014/02/11 20:37:43]

Done.

+  i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
+  ENTER_V8(i_isolate);
+  i::HandleScope scope(i_isolate);
+  STATIC_ASSERT(
+      sizeof(ExternalMicrotaskCallback) == sizeof(v8::internal::Address));
+  Local<External> external_callback =
+      External::New(isolate,
+          reinterpret_cast<void*>(reinterpret_cast<intptr_t>(callback)));
+  Local<Function> local_handler = Function::New(isolate,
+      &ExternalMicrotaskFunctionCallback, external_callback);
+  i::Handle<i::Object> handler = Utils::OpenHandle(*local_handler);
+  i::V8::EnqueueExternalMicrotask(i_isolate, handler);
+}
+
+
+void V8::SetAutorunMicrotasks(Isolate* isolate, bool autorun) {
+  reinterpret_cast<i::Isolate*>(isolate)->set_autorun_microtasks(autorun);
+}
+
+
 void V8::RemoveCallCompletedCallback(CallCompletedCallback callback) {
   i::V8::RemoveCallCompletedCallback(callback);
 }
 
 
 void V8::TerminateExecution(Isolate* isolate) {
   // If no isolate is supplied, use the default isolate.
   if (isolate != NULL) {
     reinterpret_cast<i::Isolate*>(isolate)->stack_guard()->TerminateExecution();
   } else {
@@ skipping 1045 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