Moved XMPP notifier library from chrome/browser/sync to chrome/common....

chrome/browser/sync/notifier/base/signal_thread_task.h

-// Copyright (c) 2009 The Chromium 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 CHROME_BROWSER_SYNC_NOTIFIER_BASE_SIGNAL_THREAD_TASK_H_
-#define CHROME_BROWSER_SYNC_NOTIFIER_BASE_SIGNAL_THREAD_TASK_H_
-
-#include "talk/base/common.h"
-#include "talk/base/signalthread.h"
-#include "talk/base/sigslot.h"
-#include "talk/base/task.h"
-
-namespace notifier {
-
-template<class T>
-class SignalThreadTask : public talk_base::Task,
-                         public sigslot::has_slots<> {
- public:
-  // Takes ownership of signal_thread.
-  SignalThreadTask(talk_base::Task* task_parent, T** signal_thread)
-    : talk_base::Task(task_parent),
-      signal_thread_(NULL),
-      finished_(false) {
-    SetSignalThread(signal_thread);
-  }
-
-  virtual ~SignalThreadTask() {
-    ClearSignalThread();
-  }
-
-  virtual void Stop() {
-    Task::Stop();
-    ClearSignalThread();
-  }
-
-  virtual int ProcessStart() {
-    ASSERT(GetState() == talk_base::Task::STATE_START);
-    signal_thread_->SignalWorkDone.connect(
-        this,
-        &SignalThreadTask<T>::OnWorkDone);
-    signal_thread_->Start();
-    return talk_base::Task::STATE_RESPONSE;
-  }
-
-  int ProcessResponse() {
-    if (!finished_) {
-      return talk_base::Task::STATE_BLOCKED;
-    }
-    SignalWorkDone(signal_thread_);
-    ClearSignalThread();
-    return talk_base::Task::STATE_DONE;
-  }
-
-  sigslot::signal1<T*> SignalWorkDone;
-
- private:
-  // Takes ownership of signal_thread.
-  void SetSignalThread(T** signal_thread) {
-    ASSERT(!signal_thread_ && signal_thread && *signal_thread);
-    // Verify that no one is listening to the signal thread for work done.
-    // They should be using this class instead.
-    ASSERT((*signal_thread)->SignalWorkDone.is_empty());
-
-    signal_thread_ = *signal_thread;
-
-    // Helps callers not to use signal thread after this point since this class
-    // has taken ownership (and avoid the error of doing
-    // signal_thread->Start()).
-    *signal_thread = NULL;
-  }
-
-  void OnWorkDone(talk_base::SignalThread* signal_thread) {
-    ASSERT(signal_thread == signal_thread_);
-    finished_ = true;
-    Wake();
-  }
-
-  void ClearSignalThread() {
-    if (signal_thread_) {
-      // Don't wait on the thread destruction, or we may deadlock.
-      signal_thread_->Destroy(false);
-      signal_thread_ = NULL;
-    }
-  }
-
-  T* signal_thread_;
-  bool finished_;
-  DISALLOW_COPY_AND_ASSIGN(SignalThreadTask);
-};
-
-}  // namespace notifier
-
-#endif  // CHROME_BROWSER_SYNC_NOTIFIER_BASE_SIGNAL_THREAD_TASK_H_