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-rw-r--r-- | framework/inc/helper/shareablemutex.hxx | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/framework/inc/helper/shareablemutex.hxx b/framework/inc/helper/shareablemutex.hxx new file mode 100644 index 000000000..9470983fb --- /dev/null +++ b/framework/inc/helper/shareablemutex.hxx @@ -0,0 +1,94 @@ +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ +/* + * This file is part of the LibreOffice project. + * + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. + * + * This file incorporates work covered by the following license notice: + * + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed + * with this work for additional information regarding copyright + * ownership. The ASF licenses this file to you under the Apache + * License, Version 2.0 (the "License"); you may not use this file + * except in compliance with the License. You may obtain a copy of + * the License at http://www.apache.org/licenses/LICENSE-2.0 . + */ + +#ifndef INCLUDED_FRAMEWORK_INC_HELPER_SHAREABLEMUTEX_HXX +#define INCLUDED_FRAMEWORK_INC_HELPER_SHAREABLEMUTEX_HXX + +#include <osl/interlck.h> +#include <osl/mutex.hxx> +#include <fwidllapi.h> + +namespace framework +{ + +/** + * This acts like a rtl::Reference<osl::Mutex> + */ +class ShareableMutex +{ + public: + ShareableMutex(); + ShareableMutex( const ShareableMutex& rShareableMutex ); + ShareableMutex& operator=( const ShareableMutex& rShareableMutex ); + + ~ShareableMutex() { m_pMutexRef->release(); } + + /** acquire the shared mutex */ + void acquire(); + /** release the shared mutex */ + void release(); + + private: + /* ShareableMutex::MutexRef will destroy itself when the last ShareableMutex pointing to it is destroyed */ + struct MutexRef + { + MutexRef() : m_refCount(0) {} + void acquire() + { + osl_atomic_increment( &m_refCount ); + } + + void release() + { + if ( osl_atomic_decrement( &m_refCount ) == 0 ) + delete this; + } + + oslInterlockedCount m_refCount; + osl::Mutex m_oslMutex; + }; + + MutexRef* m_pMutexRef; +}; + +class ShareGuard +{ + public: + explicit ShareGuard( ShareableMutex& rShareMutex ) : + m_rShareMutex( rShareMutex ) + { + m_rShareMutex.acquire(); + } + + ~ShareGuard() + { + m_rShareMutex.release(); + } + + private: + ShareGuard& operator=( const ShareGuard& ) = delete; + + ShareableMutex& m_rShareMutex; +}; + +} + +#endif // INCLUDED_FRAMEWORK_INC_HELPER_SHAREABLEMUTEX_HXX + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |