framework/inc/helper/shareablemutex.hxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20 #ifndef __FRAMEWORK_HELPER_SHAREABLEMUTEX_HXX_
  21 #define __FRAMEWORK_HELPER_SHAREABLEMUTEX_HXX_
  22
  23 #include <osl/interlck.h>
  24 #include <osl/mutex.hxx>
  25 #include <fwidllapi.h>
  26
  27 namespace framework
  28 {
  29
  30 class FWI_DLLPUBLIC ShareableMutex
  31 {
  32     public:
  33         ShareableMutex();
  34         ShareableMutex( const ShareableMutex& rShareableMutex );
  35         const ShareableMutex& operator=( const ShareableMutex& rShareableMutex );
  36
  37         ~ShareableMutex();
  38
  39         void acquire();
  40         void release();
  41
  42     private:
  43         struct MutexRef
  44         {
  45             MutexRef() : m_refCount(0) {}
  46             void acquire()
  47             {
  48                 osl_atomic_increment( &m_refCount );
  49             }
  50
  51             void release()
  52             {
  53                 if ( osl_atomic_decrement( &m_refCount ) == 0 )
  54                     delete this;
  55             }
  56
  57             oslInterlockedCount m_refCount;
  58             osl::Mutex          m_oslMutex;
  59         };
  60
  61         MutexRef* pMutexRef;
  62 };
  63
  64 class ShareGuard
  65 {
  66     public:
  67         ShareGuard( ShareableMutex& rShareMutex ) :
  68             m_rShareMutex( rShareMutex )
  69         {
  70             m_rShareMutex.acquire();
  71         }
  72
  73         ~ShareGuard()
  74         {
  75             m_rShareMutex.release();
  76         }
  77
  78     private:
  79         ShareGuard();
  80         ShareGuard& operator=( const ShareGuard& );
  81
  82         ShareableMutex& m_rShareMutex;
  83 };
  84
  85 }
  86
  87 #endif // #ifndef __FRAMEWORK_HELPER_SHAREABLEMUTEX_HXX_
  88
  89 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */