xbmc/threads/SingleLock.h

   1 /*
   2  *  Copyright (c) 2002 Frodo
   3  *      Portions Copyright (c) by the authors of ffmpeg and xvid
   4  *  Copyright (C) 2002-2018 Team Kodi
   5  *  This file is part of Kodi - https://kodi.tv
   6  *
   7  *  SPDX-License-Identifier: GPL-2.0-or-later
   8  *  See LICENSES/README.md for more information.
   9  */
  10
  11 #pragma once
  12
  13 #include "threads/CriticalSection.h"
  14
  15 #include <mutex>
  16
  17 /**
  18  * This implements a "guard" pattern for exiting all locks
  19  *  currently being held by the current thread and restoring
  20  *  those locks on destruction.
  21  *
  22  * This class can be used on a CCriticalSection that isn't owned
  23  *  by this thread in which case it will do nothing.
  24  */
  25 class CSingleExit
  26 {
  27   CCriticalSection& sec;
  28   unsigned int count;
  29 public:
  30   inline explicit CSingleExit(CCriticalSection& cs) : sec(cs), count(cs.exit()) { }
  31   inline ~CSingleExit() { sec.restore(count); }
  32 };