src/CriticalSection_Win32.h

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // MuldeR's Utilities for Qt
   3 // Copyright (C) 2004-2019 LoRd_MuldeR <MuldeR2@GMX.de>
   4 //
   5 // This library is free software; you can redistribute it and/or
   6 // modify it under the terms of the GNU Lesser General Public
   7 // License as published by the Free Software Foundation; either
   8 // version 2.1 of the License, or (at your option) any later version.
   9 //
  10 // This library is distributed in the hope that it will be useful,
  11 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13 // Lesser General Public License for more details.
  14 //
  15 // You should have received a copy of the GNU Lesser General Public
  16 // License along with this library; if not, write to the Free Software
  17 // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  18 //
  19 // http://www.gnu.org/licenses/lgpl-2.1.txt
  20 //////////////////////////////////////////////////////////////////////////////////
  21
  22 #pragma once
  23
  24 //Win32 API
  25 #ifndef _INC_WINDOWS
  26 #define WIN32_LEAN_AND_MEAN 1
  27 #include <Windows.h>
  28 #endif //_INC_WINDOWS
  29
  30 ///////////////////////////////////////////////////////////////////////////////
  31 // CRITICAL SECTION
  32 ///////////////////////////////////////////////////////////////////////////////
  33
  34 namespace MUtils
  35 {
  36         namespace Internal
  37         {
  38                 /*
  39                  * wrapper for native Win32 critical sections
  40                  */
  41                 class CriticalSection
  42                 {
  43                 public:
  44                         inline CriticalSection(void)
  45                         {
  46                                 InitializeCriticalSection(&m_win32criticalSection);
  47                         }
  48
  49                         inline ~CriticalSection(void)
  50                         {
  51                                 DeleteCriticalSection(&m_win32criticalSection);
  52                         }
  53
  54                         inline void enter(void)
  55                         {
  56                                 EnterCriticalSection(&m_win32criticalSection);
  57                         }
  58
  59                         inline bool tryEnter(void)
  60                         {
  61                                 return TryEnterCriticalSection(&m_win32criticalSection);
  62                         }
  63
  64                         inline void leave(void)
  65                         {
  66                                 LeaveCriticalSection(&m_win32criticalSection);
  67                         }
  68
  69                 protected:
  70                         CRITICAL_SECTION m_win32criticalSection;
  71                 };
  72
  73                 /*
  74                  * RAII-style critical section locker
  75                  */
  76                 class CSLocker
  77                 {
  78                 public:
  79                         inline CSLocker(CriticalSection &criticalSection)
  80                         :
  81                                 m_criticalSection(criticalSection)
  82                         {
  83                                 m_criticalSection.enter();
  84                                 m_locked.ref();
  85                         }
  86
  87                         inline ~CSLocker(void)
  88                         {
  89                                 forceUnlock();
  90                         }
  91
  92                         inline void forceUnlock(void)
  93                         {
  94                                 if (m_locked.fetchAndStoreOrdered(0) > 0)
  95                                 {
  96                                         m_criticalSection.leave();
  97                                 }
  98                         }
  99                 protected:
 100                         QAtomicInt m_locked;
 101                         CriticalSection &m_criticalSection;
 102                 };
 103         }
 104 }