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/**
* @file lllfsthread.h
* @brief LLLFSThread base class
*
* $LicenseInfo:firstyear=2000&license=viewergpl$
*
* Copyright (c) 2000-2008, 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://secondlifegrid.net/programs/open_source/licensing/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://secondlifegrid.net/programs/open_source/licensing/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_LLLFSTHREAD_H
#define LL_LLLFSTHREAD_H
#include <queue>
#include <string>
#include <map>
#include <set>
#include "llapr.h"
#include "llqueuedthread.h"
//============================================================================
// Threaded Local File System
//============================================================================
class LLLFSThread : public LLQueuedThread
{
//------------------------------------------------------------------------
public:
enum operation_t {
FILE_READ,
FILE_WRITE,
FILE_RENAME,
FILE_REMOVE
};
//------------------------------------------------------------------------
public:
class Responder : public LLThreadSafeRefCount
{
protected:
~Responder();
public:
virtual void completed(S32 bytes) = 0;
};
class Request : public QueuedRequest
{
protected:
virtual ~Request(); // use deleteRequest()
public:
Request(LLLFSThread* thread,
handle_t handle, U32 priority,
operation_t op, const LLString& filename,
U8* buffer, S32 offset, S32 numbytes,
Responder* responder);
S32 getBytes()
{
return mBytes;
}
S32 getBytesRead()
{
return mBytesRead;
}
S32 getOperation()
{
return mOperation;
}
U8* getBuffer()
{
return mBuffer;
}
const LLString& getFilename()
{
return mFileName;
}
/*virtual*/ bool processRequest();
/*virtual*/ void finishRequest(bool completed);
/*virtual*/ void deleteRequest();
private:
LLLFSThread* mThread;
operation_t mOperation;
LLString mFileName;
U8* mBuffer; // dest for reads, source for writes, new UUID for rename
S32 mOffset; // offset into file, -1 = append (WRITE only)
S32 mBytes; // bytes to read from file, -1 = all
S32 mBytesRead; // bytes read from file
LLPointer<Responder> mResponder;
};
//------------------------------------------------------------------------
public:
LLLFSThread(bool threaded = TRUE);
~LLLFSThread();
// Return a Request handle
handle_t read(const LLString& filename, /* Flawfinder: ignore */
U8* buffer, S32 offset, S32 numbytes,
Responder* responder, U32 pri=0);
handle_t write(const LLString& filename,
U8* buffer, S32 offset, S32 numbytes,
Responder* responder, U32 pri=0);
// Misc
U32 priorityCounter() { return mPriorityCounter-- & PRIORITY_LOWBITS; } // Use to order IO operations
// static initializers
static void initClass(bool local_is_threaded = TRUE); // Setup sLocal
static S32 updateClass(U32 ms_elapsed);
static void cleanupClass(); // Delete sLocal
private:
U32 mPriorityCounter;
public:
static LLLFSThread* sLocal; // Default local file thread
};
//============================================================================
#endif // LL_LLLFSTHREAD_H
|
