[inspector] finish test runner gracefully..

test/inspector/inspector-test.cc

 // 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.
 
 #if !defined(_WIN32) && !defined(_WIN64)
 #include <unistd.h>  // NOLINT
 #endif               // !defined(_WIN32) && !defined(_WIN64)
 
 #include <locale.h>
 
 #include "include/libplatform/libplatform.h"
 #include "include/v8.h"
 
 #include "src/base/platform/platform.h"
 #include "src/flags.h"
 #include "src/utils.h"
 #include "src/vector.h"
 
 #include "test/inspector/inspector-impl.h"
 #include "test/inspector/task-runner.h"
 
 namespace {
 
+std::vector<TaskRunner*> task_runners;
+
+void Terminate() {
+  for (size_t i = 0; i < task_runners.size(); ++i) {
+    task_runners[i]->Terminate();
+    task_runners[i]->Join();
+  }
+  std::vector<TaskRunner*> empty;
+  task_runners.swap(empty);
+}
+
 void Exit() {
   fflush(stdout);
   fflush(stderr);
-  _exit(0);
+  Terminate();
 }
 
 class UtilsExtension : public v8::Extension {
  public:
   UtilsExtension()
       : v8::Extension("v8_inspector/utils",
                       "native function print();"
                       "native function quit();"
                       "native function setlocale();"
                       "native function load();") {}
@@ skipping 237 matching lines @@
   v8::ExtensionConfiguration frontend_configuration(
       arraysize(frontend_extensions), frontend_extensions);
   TaskRunner frontend_runner(&frontend_configuration, true, &ready_semaphore);
   ready_semaphore.Wait();
 
   FrontendChannelImpl frontend_channel(&frontend_runner);
   InspectorClientImpl inspector_client(&backend_runner, &frontend_channel,
                                        &ready_semaphore);
   ready_semaphore.Wait();
 
+  task_runners.push_back(&frontend_runner);
+  task_runners.push_back(&backend_runner);
+
   for (int i = 1; i < argc; ++i) {
     if (argv[i][0] == '-') break;
 
     bool exists = false;
     v8::internal::Vector<const char> chars =
         v8::internal::ReadFile(argv[i], &exists, true);
     if (!exists) {
       fprintf(stderr, "Internal error: script file doesn't exists: %s\n",
               argv[i]);
       Exit();
     }
     frontend_runner.Append(new ExecuteStringTask(chars));
   }
 
   frontend_runner.Join();
+  backend_runner.Join();
   return 0;
 }