src: add Env::profiler_idle_notifier_started()

PR-URL: #93
Reviewed-By: Anna Henningsen <[email protected]>
Reviewed-By: Stephen Belanger <[email protected]>

Author: TimothyGu

src/env-inl.h

@@ -284,6 +284,7 @@ inline Environment::Environment(IsolateData* isolate_data,
                                 v8::Local<v8::Context> context)
     : isolate_(context->GetIsolate()),
       isolate_data_(isolate_data),
+      profiler_idle_notifier_started_(false),
       async_hooks_(context->GetIsolate()),
       timer_base_(uv_now(isolate_data->event_loop())),
       using_domains_(false),
@@ -337,6 +338,10 @@ inline Environment::~Environment() {
   free(performance_state_);
 }
 
+inline bool Environment::profiler_idle_notifier_started() const {
+  return profiler_idle_notifier_started_;
+}
+
 inline v8::Isolate* Environment::isolate() const {
   return isolate_;
 }

src/env.cc

@@ -111,6 +111,11 @@ void Environment::CleanupHandles() {
 }
 
 void Environment::StartProfilerIdleNotifier() {
+  if (profiler_idle_notifier_started_)
+    return;
+
+  profiler_idle_notifier_started_ = true;
+
   uv_prepare_start(&idle_prepare_handle_, [](uv_prepare_t* handle) {
     Environment* env = ContainerOf(&Environment::idle_prepare_handle_, handle);
     env->isolate()->GetCpuProfiler()->SetIdle(true);
@@ -123,6 +128,7 @@ void Environment::StartProfilerIdleNotifier() {
 }
 
 void Environment::StopProfilerIdleNotifier() {
+  profiler_idle_notifier_started_ = false;
   uv_prepare_stop(&idle_prepare_handle_);
   uv_check_stop(&idle_check_handle_);
 }

src/env.h

@@ -543,6 +543,7 @@ class Environment {
 
   void StartProfilerIdleNotifier();
   void StopProfilerIdleNotifier();
+  inline bool profiler_idle_notifier_started() const;
 
   inline v8::Isolate* isolate() const;
   inline uv_loop_t* event_loop() const;
@@ -703,6 +704,7 @@ class Environment {
   uv_timer_t destroy_async_ids_timer_handle_;
   uv_prepare_t idle_prepare_handle_;
   uv_check_t idle_check_handle_;
+  bool profiler_idle_notifier_started_;
 
   AsyncHooks async_hooks_;
   DomainFlag domain_flag_;