src: shutdown platform from FreePlatform()

There is currently no way to properly do this.

Backport-PR-URL: #35241
PR-URL: #30467
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>

src/node_platform.cc

@@ -333,6 +333,10 @@ NodePlatform::NodePlatform(int thread_pool_size,
       std::make_shared<WorkerThreadsTaskRunner>(thread_pool_size);
 }
 
+NodePlatform::~NodePlatform() {
+  Shutdown();
+}
+
 void NodePlatform::RegisterIsolate(Isolate* isolate, uv_loop_t* loop) {
   Mutex::ScopedLock lock(per_isolate_mutex_);
   std::shared_ptr<PerIsolatePlatformData> existing = per_isolate_[isolate];
@@ -362,6 +366,8 @@ void NodePlatform::AddIsolateFinishedCallback(Isolate* isolate,
 }
 
 void NodePlatform::Shutdown() {
+  if (has_shut_down_) return;
+  has_shut_down_ = true;
   worker_thread_task_runner_->Shutdown();
 
   {

src/node_platform.h

@@ -138,7 +138,7 @@ class NodePlatform : public MultiIsolatePlatform {
  public:
   NodePlatform(int thread_pool_size,
                v8::TracingController* tracing_controller);
-  ~NodePlatform() override = default;
+  ~NodePlatform() override;
 
   void DrainTasks(v8::Isolate* isolate) override;
   void Shutdown();
@@ -181,6 +181,7 @@ class NodePlatform : public MultiIsolatePlatform {
 
   v8::TracingController* tracing_controller_;
   std::shared_ptr<WorkerThreadsTaskRunner> worker_thread_task_runner_;
+  bool has_shut_down_ = false;
 };
 
 }  // namespace node