[inspector] finish test runner gracefully..

test/inspector/task-runner.h

 // Copyright 2016 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_TEST_INSPECTOR_PROTOCOL_TASK_RUNNER_H_
 #define V8_TEST_INSPECTOR_PROTOCOL_TASK_RUNNER_H_
 
 #include "include/v8-inspector.h"
 #include "include/v8-platform.h"
 #include "include/v8.h"
+#include "src/base/atomic-utils.h"
 #include "src/base/macros.h"
 #include "src/base/platform/platform.h"
 #include "src/locked-queue-inl.h"
 #include "src/vector.h"
 
 class TaskRunner : public v8::base::Thread {
  public:
   class Task {
    public:
     virtual ~Task() {}
@@ skipping 11 matching lines @@
 
   // Should be called from the same thread and only from task.
   void RunMessageLoop(bool only_protocol);
   void QuitMessageLoop();
 
   // TaskRunner takes ownership.
   void Append(Task* task);
 
   static TaskRunner* FromContext(v8::Local<v8::Context>);
 
+  void Terminate();
+
  private:
   void InitializeContext();
   Task* GetNext(bool only_protocol);
 
   v8::ExtensionConfiguration* extensions_;
   bool catch_exceptions_;
   v8::base::Semaphore* ready_semaphore_;
 
   v8::Isolate* isolate_;
   v8::Global<v8::Context> context_;
 
   // deferred_queue_ combined with queue_ (in this order) have all tasks in the
-  // correct order.
-  // Sometimes we skip non-protocol tasks by moving them from queue_ to
-  // deferred_queue_.
+  // correct order. Sometimes we skip non-protocol tasks by moving them from
+  // queue_ to deferred_queue_.
   v8::internal::LockedQueue<Task*> queue_;
   v8::internal::LockedQueue<Task*> deffered_queue_;
   v8::base::Semaphore process_queue_semaphore_;
 
   int nested_loop_count_;
 
+  v8::base::AtomicNumber<int> is_terminated_;
+
   DISALLOW_COPY_AND_ASSIGN(TaskRunner);
 };
 
 class ExecuteStringTask : public TaskRunner::Task {
  public:
   explicit ExecuteStringTask(const v8::internal::Vector<uint16_t>& expression);
   explicit ExecuteStringTask(
       const v8::internal::Vector<const char>& expression);
   bool is_inspector_task() override { return false; }
 
   void Run(v8::Isolate* isolate,
            const v8::Global<v8::Context>& context) override;
 
  private:
   v8::internal::Vector<uint16_t> expression_;
   v8::internal::Vector<const char> expression_utf8_;
 
   DISALLOW_COPY_AND_ASSIGN(ExecuteStringTask);
 };
 
 #endif  //  V8_TEST_INSPECTOR_PROTOCOL_TASK_RUNNER_H_