V8 Microtask Queue & API

src/v8.cc

Index: src/v8.cc
diff --git a/src/v8.cc b/src/v8.cc
index b89bb7a69bb48afaab13dca1916c983fb7762cef..28454b437e5d9f75141572e37865b01e3220dfae 100644
--- a/src/v8.cc
+++ b/src/v8.cc
@@ -148,15 +148,16 @@ void V8::RemoveCallCompletedCallback(CallCompletedCallback callback) {
 
 void V8::FireCallCompletedCallback(Isolate* isolate) {
   bool has_call_completed_callbacks = call_completed_callbacks_ != NULL;
-  bool microtask_pending = isolate->microtask_pending();
-  if (!has_call_completed_callbacks && !microtask_pending) return;
+  bool run_microtasks = isolate->autorun_microtasks() &&
+                        isolate->microtask_pending();
+  if (!has_call_completed_callbacks && !run_microtasks) return;
 
   HandleScopeImplementer* handle_scope_implementer =
       isolate->handle_scope_implementer();
   if (!handle_scope_implementer->CallDepthIsZero()) return;
   // Fire callbacks.  Increase call depth to prevent recursive callbacks.
   handle_scope_implementer->IncrementCallDepth();
-  if (microtask_pending) Execution::RunMicrotasks(isolate);
+  if (run_microtasks) Execution::RunMicrotasks(isolate);
   if (has_call_completed_callbacks) {
     for (int i = 0; i < call_completed_callbacks_->length(); i++) {
       call_completed_callbacks_->at(i)();
@@ -166,6 +167,21 @@ void V8::FireCallCompletedCallback(Isolate* isolate) {
 }
 
 
+void V8::RunMicrotasks(Isolate* isolate) {
+  if (!isolate->microtask_pending())
+    return;
+
+  HandleScopeImplementer* handle_scope_implementer =
+      isolate->handle_scope_implementer();
+  ASSERT(handle_scope_implementer->CallDepthIsZero());
+
+  // Increase call depth to prevent recursive callbacks.
+  handle_scope_implementer->IncrementCallDepth();
+  Execution::RunMicrotasks(isolate);
+  handle_scope_implementer->DecrementCallDepth();
+}
+
+
 void V8::InitializeOncePerProcessImpl() {
   FlagList::EnforceFlagImplications();