1 files changed, 90 insertions, 0 deletions
diff --git a/framework/inc/helper/shareablemutex.hxx b/framework/inc/helper/shareablemutex.hxx
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+++ b/framework/inc/helper/shareablemutex.hxx
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+/* -*- 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 .
+ */
+
+#pragma once
+
+#include <osl/interlck.h>
+#include <osl/mutex.hxx>
+
+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;
+};
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */