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       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 INCLUDED_FRAMEWORK_INC_HELPER_SHAREABLEMUTEX_HXX
      21             : #define INCLUDED_FRAMEWORK_INC_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             : /**
      31             :  * This acts like a rtl::Reference<osl::Mutex>
      32             :  */
      33             : class FWI_DLLPUBLIC ShareableMutex
      34             : {
      35             :     public:
      36             :         ShareableMutex();
      37             :         ShareableMutex( const ShareableMutex& rShareableMutex );
      38             :         const ShareableMutex& operator=( const ShareableMutex& rShareableMutex );
      39             : 
      40        3226 :         ~ShareableMutex() { m_pMutexRef->release(); }
      41             : 
      42             :         /** acquire the shared mutex */
      43             :         void acquire();
      44             :         /** release the shared mutex */
      45             :         void release();
      46             : 
      47             :     private:
      48             :         /* ShareableMutex::MutexRef will destroy itself when the last ShareableMutex pointing to it is destroyed */
      49         249 :         struct MutexRef
      50             :         {
      51         250 :             MutexRef() : m_refCount(0) {}
      52        3240 :             void acquire()
      53             :             {
      54        3240 :                 osl_atomic_increment( &m_refCount );
      55        3240 :             }
      56             : 
      57        3226 :             void release()
      58             :             {
      59        3226 :                 if ( osl_atomic_decrement( &m_refCount ) == 0 )
      60         249 :                     delete this;
      61        3226 :             }
      62             : 
      63             :             oslInterlockedCount m_refCount;
      64             :             osl::Mutex          m_oslMutex;
      65             :         };
      66             : 
      67             :         MutexRef* m_pMutexRef;
      68             : };
      69             : 
      70             : class ShareGuard
      71             : {
      72             :     public:
      73      631416 :         ShareGuard( ShareableMutex& rShareMutex ) :
      74      631416 :             m_rShareMutex( rShareMutex )
      75             :         {
      76      631416 :             m_rShareMutex.acquire();
      77      631416 :         }
      78             : 
      79      631416 :         ~ShareGuard()
      80             :         {
      81      631416 :             m_rShareMutex.release();
      82      631416 :         }
      83             : 
      84             :     private:
      85             :         ShareGuard& operator=( const ShareGuard& ) SAL_DELETED_FUNCTION;
      86             : 
      87             :         ShareableMutex& m_rShareMutex;
      88             : };
      89             : 
      90             : }
      91             : 
      92             : #endif // INCLUDED_FRAMEWORK_INC_HELPER_SHAREABLEMUTEX_HXX
      93             : 
      94             : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */