src: fix Worker termination in inspector.waitForDebugger

Signed-off-by: Daeyeon Jeong <daeyeon.dev@gmail.com>
PR-URL: https://github.com/nodejs/node/pull/52527
Fixes: https://github.com/nodejs/node/issues/52467
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Kohei Ueno <kohei.ueno119@gmail.com>

src/env.cc

@@ -1110,6 +1110,13 @@ void Environment::InitializeCompileCache() {
 void Environment::ExitEnv(StopFlags::Flags flags) {
   // Should not access non-thread-safe methods here.
   set_stopping(true);
+
+#if HAVE_INSPECTOR
+  if (inspector_agent_) {
+    inspector_agent_->StopIfWaitingForConnect();
+  }
+#endif
+
   if ((flags & StopFlags::kDoNotTerminateIsolate) == 0)
     isolate_->TerminateExecution();
   SetImmediateThreadsafe([](Environment* env) {

src/inspector/main_thread_interface.cc

@@ -225,11 +225,20 @@ bool MainThreadInterface::WaitForFrontendEvent() {
   dispatching_messages_ = false;
   if (dispatching_message_queue_.empty()) {
     Mutex::ScopedLock scoped_lock(requests_lock_);
-    while (requests_.empty()) incoming_message_cond_.Wait(scoped_lock);
+    while (!stop_waiting_for_frontend_event_requested_ && requests_.empty()) {
+      incoming_message_cond_.Wait(scoped_lock);
+    }
+    stop_waiting_for_frontend_event_requested_ = false;
   }
   return true;
 }
 
+void MainThreadInterface::StopWaitingForFrontendEvent() {
+  Mutex::ScopedLock scoped_lock(requests_lock_);
+  stop_waiting_for_frontend_event_requested_ = true;
+  incoming_message_cond_.Broadcast(scoped_lock);
+}
+
 void MainThreadInterface::DispatchMessages() {
   if (dispatching_messages_)
     return;

src/inspector/main_thread_interface.h

@@ -78,6 +78,7 @@ class MainThreadInterface :
   void DispatchMessages();
   void Post(std::unique_ptr<Request> request);
   bool WaitForFrontendEvent();
+  void StopWaitingForFrontendEvent();
   std::shared_ptr<MainThreadHandle> GetHandle();
   Agent* inspector_agent() {
     return agent_;
@@ -94,6 +95,10 @@ class MainThreadInterface :
   // when we reenter the DispatchMessages function.
   MessageQueue dispatching_message_queue_;
   bool dispatching_messages_ = false;
+  // This flag indicates an internal request to exit the loop in
+  // WaitForFrontendEvent(). It's set to true by calling
+  // StopWaitingForFrontendEvent().
+  bool stop_waiting_for_frontend_event_requested_ = false;
   ConditionVariable incoming_message_cond_;
   // Used from any thread
   Agent* const agent_;

src/inspector_agent.cc

@@ -477,6 +477,20 @@ class NodeInspectorClient : public V8InspectorClient {
     }
   }
 
+  void StopIfWaitingForFrontendEvent() {
+    if (!waiting_for_frontend_) {
+      return;
+    }
+    waiting_for_frontend_ = false;
+    for (const auto& id_channel : channels_) {
+      id_channel.second->unsetWaitingForDebugger();
+    }
+
+    if (interface_) {
+      interface_->StopWaitingForFrontendEvent();
+    }
+  }
+
   int connectFrontend(std::unique_ptr<InspectorSessionDelegate> delegate,
                       bool prevent_shutdown) {
     int session_id = next_session_id_++;
@@ -1024,6 +1038,13 @@ void Agent::WaitForConnect() {
   client_->waitForFrontend();
 }
 
+void Agent::StopIfWaitingForConnect() {
+  if (client_ == nullptr) {
+    return;
+  }
+  client_->StopIfWaitingForFrontendEvent();
+}
+
 std::shared_ptr<WorkerManager> Agent::GetWorkerManager() {
   THROW_IF_INSUFFICIENT_PERMISSIONS(parent_env_,
                                     permission::PermissionScope::kInspector,

src/inspector_agent.h

@@ -61,6 +61,8 @@ class Agent {
 
   // Blocks till frontend connects and sends "runIfWaitingForDebugger"
   void WaitForConnect();
+  void StopIfWaitingForConnect();
+
   // Blocks till all the sessions with "WaitForDisconnectOnShutdown" disconnect
   void WaitForDisconnect();
   void ReportUncaughtException(v8::Local<v8::Value> error,

test/parallel/test-inspector-exit-worker-in-wait-for-connection.js

@@ -0,0 +1,46 @@
+'use strict';
+
+const common = require('../common');
+common.skipIfInspectorDisabled();
+
+const { parentPort, workerData, Worker } = require('node:worker_threads');
+if (!workerData) {
+  common.skipIfWorker();
+}
+
+const inspector = require('node:inspector');
+const assert = require('node:assert');
+
+let TIMEOUT = common.platformTimeout(5000);
+if (common.isWindows) {
+  // Refs: https://github.com/nodejs/build/issues/3014
+  TIMEOUT = common.platformTimeout(15000);
+}
+
+// Refs: https://github.com/nodejs/node/issues/52467
+
+(async () => {
+  if (!workerData) {
+    // worker.terminate() should terminate the worker and the pending
+    // inspector.waitForDebugger().
+    {
+      const worker = new Worker(__filename, { workerData: {} });
+      await new Promise((r) => worker.on('message', r));
+      await new Promise((r) => setTimeout(r, TIMEOUT));
+      worker.on('exit', common.mustCall());
+      await worker.terminate();
+    }
+    // process.exit() should kill the process.
+    {
+      const worker = new Worker(__filename, { workerData: {} });
+      await new Promise((r) => worker.on('message', r));
+      await new Promise((r) => setTimeout(r, TIMEOUT));
+      process.on('exit', (status) => assert.strictEqual(status, 0));
+      setImmediate(() => process.exit());
+    }
+  } else {
+    inspector.open(0, undefined, false);
+    parentPort.postMessage('open');
+    inspector.waitForDebugger();
+  }
+})().then(common.mustCall());