the begginning

versioning/BRM/brmshmimpl.h

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+/* Copyright (C) 2014 InfiniDB, Inc.
+
+   This program is free software; you can redistribute it and/or
+   modify it under the terms of the GNU General Public License
+   as published by the Free Software Foundation; version 2 of
+   the License.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+   MA 02110-1301, USA. */
+
+/******************************************************************************
+ * $Id$
+ *
+ *****************************************************************************/
+
+/** @file 
+ * class BRMShmImpl
+ */
+
+#ifndef IDBSHMIMPL_H_
+#define IDBSHMIMPL_H_
+
+#include <unistd.h>
+//#define NDEBUG
+#include <cassert>
+#include <boost/interprocess/shared_memory_object.hpp>
+#include <boost/interprocess/mapped_region.hpp>
+
+namespace BRM {
+
+class BRMShmImpl
+{
+public:
+	BRMShmImpl(unsigned key, off_t size, bool readOnly=false);
+	~BRMShmImpl() { }
+
+	inline unsigned key() const { return fKey; }
+	inline off_t size() const { return fSize; }
+	inline bool isReadOnly() const { return fReadOnly; }
+
+	void setReadOnly();
+	int grow(unsigned newKey, off_t newSize);
+	int clear(unsigned newKey, off_t newSize);
+
+	void swap(BRMShmImpl& rhs);
+	void destroy();
+
+	boost::interprocess::shared_memory_object fShmobj;
+	boost::interprocess::mapped_region fMapreg;
+
+private:
+	BRMShmImpl(const BRMShmImpl& rhs);
+	BRMShmImpl& operator=(const BRMShmImpl& rhs);
+
+	unsigned fKey;
+	off_t fSize;
+	bool fReadOnly;
+};
+
+} //namespace
+
+#endif