mojo/shell/keep_alive.h

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef MOJO_SHELL_KEEP_ALIVE_H_
   6 #define MOJO_SHELL_KEEP_ALIVE_H_
   7
   8 #include "base/basictypes.h"
   9
  10 namespace mojo {
  11 namespace shell {
  12
  13 class Context;
  14 class KeepAlive;
  15
  16 class KeepAliveCounter {
  17  public:
  18   KeepAliveCounter() : count_(0) {
  19   }
  20  private:
  21   friend class KeepAlive;
  22   int count_;
  23 };
  24
  25 // Instantiate this class to extend the lifetime of the thread associated
  26 // with |context| (i.e., the shell's UI thread). Must only be used from
  27 // the shell's UI thread.
  28 class KeepAlive {
  29  public:
  30   explicit KeepAlive(Context* context);
  31   ~KeepAlive();
  32
  33  private:
  34   static void MaybeQuit(Context* context);
  35
  36   Context* context_;
  37
  38   DISALLOW_COPY_AND_ASSIGN(KeepAlive);
  39 };
  40
  41 }  // namespace shell
  42 }  // namespace mojo
  43
  44 #endif  // MOJO_SHELL_KEEP_ALIVE_H_