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/**
* @file llpluginsharedmemory.h
* @brief LLPluginSharedMemory manages a shared memory segment for use by the LLPlugin API.
*
* $LicenseInfo:firstyear=2008&license=viewergpl$
*
* Copyright (c) 2008, Linden Research, Inc.
*
* Second Life Viewer Source Code
* The source code in this file ("Source Code") is provided by Linden Lab
* to you under the terms of the GNU General Public License, version 2.0
* ("GPL"), unless you have obtained a separate licensing agreement
* ("Other License"), formally executed by you and Linden Lab. Terms of
* the GPL can be found in doc/GPL-license.txt in this distribution, or
* online at http://secondlife.com/developers/opensource/gplv2
*
* There are special exceptions to the terms and conditions of the GPL as
* it is applied to this Source Code. View the full text of the exception
* in the file doc/FLOSS-exception.txt in this software distribution, or
* online at http://secondlife.com/developers/opensource/flossexception
*
* By copying, modifying or distributing this software, you acknowledge
* that you have read and understood your obligations described above,
* and agree to abide by those obligations.
*
* ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
* WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
* COMPLETENESS OR PERFORMANCE.
* $/LicenseInfo$
*/
#ifndef LL_LLPLUGINSHAREDMEMORY_H
#define LL_LLPLUGINSHAREDMEMORY_H
class LLPluginSharedMemoryPlatformImpl;
class LLPluginSharedMemory
{
LOG_CLASS(LLPluginSharedMemory);
public:
LLPluginSharedMemory();
~LLPluginSharedMemory();
// Parent will use create/destroy, child will use attach/detach.
// Message transactions will ensure child attaches after parent creates and detaches before parent destroys.
// create() implicitly creates a name for the segment which is guaranteed to be unique on the host at the current time.
bool create(size_t size);
bool destroy(void);
bool attach(const std::string &name, size_t size);
bool detach(void);
bool isMapped(void) const { return (mMappedAddress != NULL); };
void *getMappedAddress(void) const { return mMappedAddress; };
size_t getSize(void) const { return mSize; };
std::string getName() const { return mName; };
private:
bool map(void);
bool unmap(void);
bool close(void);
bool unlink(void);
std::string mName;
size_t mSize;
void *mMappedAddress;
bool mNeedsDestroy;
LLPluginSharedMemoryPlatformImpl *mImpl;
static int sSegmentNumber;
static std::string createName();
};
#endif // LL_LLPLUGINSHAREDMEMORY_H
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