Keep only base/extractor.[cc|h].

base/single_instance.h

-// Copyright 2003-2009 Google Inc.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-// ========================================================================
-// Single Instance of a process running (plus some synchronization functions
-// that should be moved elsewhere)
-//
-// synchronization functions
-
-#ifndef OMAHA_COMMON_SINGLE_INSTANCE_H_
-#define OMAHA_COMMON_SINGLE_INSTANCE_H_
-
-#include <windows.h>
-
-#include "base/basictypes.h"
-#include "omaha/base/debug.h"
-
-namespace omaha {
-
-// Used to ensure only a single instance of a process per machine
-// (e.g., even in terminal server sessions)
-class SingleInstance {
- public:
-  // Constructor
-  SingleInstance() : user_mutex_handle_(NULL), global_mutex_handle_(NULL) {}
-
-  // Destructor
-  ~SingleInstance() { Shutdown(); }
-
-  // Check to see whether an instance is already running across all sessions.
-  // If not, enter single instance protection. The user must call Shutdown()
-  // on that SingleInstance once single instance protection is no longer needed.
-  bool StartupSingleInstance(const TCHAR* id);
-
-  // Check to see whether an instance is already running for this user. If not,
-  // enter user-only single instance protection. The user must call Shutdown()
-  // on that SingleInstance once single instance protection is no longer needed.
-  bool StartupSingleSessionInstance(const TCHAR* id);
-
-  // Startup a single instance protection. The user must call Shutdown() on
-  // that SingleInstance once the single instance protection is no longer needed.
-  HRESULT Startup(const TCHAR* id,
-                  bool* already_running,
-                  bool* already_running_in_different_session);
-
-  // Shutdown a single instance protection
-  HRESULT Shutdown();
-
-  // Check to see whether an instance is already running
-  static HRESULT CheckAlreadyRunning(
-      const TCHAR* id,
-      bool* already_running,
-      bool* already_running_in_different_session);
-
- private:
-  // Create a mutex
-  static HRESULT CreateInstanceMutex(const TCHAR* mutex_id,
-                                     HANDLE* mutex_handle,
-                                     bool* already_running);
-
-  // Open a mutex
-  static HRESULT OpenInstanceMutex(const TCHAR* mutex_id,
-                                   bool* already_running);
-
-  HANDLE user_mutex_handle_;
-  HANDLE global_mutex_handle_;
-
-  DISALLOW_EVIL_CONSTRUCTORS(SingleInstance);
-};
-
-}  // namespace omaha
-
-#endif  // OMAHA_COMMON_SINGLE_INSTANCE_H_