155 lines
4.1 KiB
C++
155 lines
4.1 KiB
C++
/**
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* @file lllfsthread.h
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* @brief LLLFSThread base class
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*
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* $LicenseInfo:firstyear=2000&license=viewergpl$
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*
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* Copyright (c) 2000-2009, Linden Research, Inc.
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*
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* Second Life Viewer Source Code
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* The source code in this file ("Source Code") is provided by Linden Lab
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* to you under the terms of the GNU General Public License, version 2.0
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* ("GPL"), unless you have obtained a separate licensing agreement
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* ("Other License"), formally executed by you and Linden Lab. Terms of
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* the GPL can be found in doc/GPL-license.txt in this distribution, or
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* online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
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*
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* There are special exceptions to the terms and conditions of the GPL as
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* it is applied to this Source Code. View the full text of the exception
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* in the file doc/FLOSS-exception.txt in this software distribution, or
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* online at
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* http://secondlifegrid.net/programs/open_source/licensing/flossexception
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*
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* By copying, modifying or distributing this software, you acknowledge
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* that you have read and understood your obligations described above,
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* and agree to abide by those obligations.
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*
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* ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
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* WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
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* COMPLETENESS OR PERFORMANCE.
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* $/LicenseInfo$
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*/
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#ifndef LL_LLLFSTHREAD_H
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#define LL_LLLFSTHREAD_H
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#include <queue>
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#include <string>
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#include <map>
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#include <set>
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#include "llapr.h"
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#include "llpointer.h"
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#include "llqueuedthread.h"
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//============================================================================
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// Threaded Local File System
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//============================================================================
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class LLLFSThread : public LLQueuedThread
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{
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//------------------------------------------------------------------------
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public:
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enum operation_t {
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FILE_READ,
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FILE_WRITE,
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FILE_RENAME,
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FILE_REMOVE
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};
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//------------------------------------------------------------------------
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public:
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class Responder : public LLThreadSafeRefCount
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{
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protected:
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~Responder();
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public:
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virtual void completed(S32 bytes) = 0;
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};
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class Request : public QueuedRequest
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{
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protected:
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virtual ~Request(); // use deleteRequest()
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public:
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Request(LLLFSThread* thread,
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handle_t handle, U32 priority,
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operation_t op, const std::string& filename,
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U8* buffer, S32 offset, S32 numbytes,
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Responder* responder);
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S32 getBytes()
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{
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return mBytes;
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}
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S32 getBytesRead()
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{
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return mBytesRead;
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}
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S32 getOperation()
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{
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return mOperation;
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}
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U8* getBuffer()
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{
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return mBuffer;
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}
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const std::string& getFilename()
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{
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return mFileName;
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}
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/*virtual*/ bool processRequest();
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/*virtual*/ void finishRequest(bool completed);
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/*virtual*/ void deleteRequest();
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private:
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LLLFSThread* mThread;
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operation_t mOperation;
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std::string mFileName;
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U8* mBuffer; // dest for reads, source for writes, new UUID for rename
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S32 mOffset; // offset into file, -1 = append (WRITE only)
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S32 mBytes; // bytes to read from file, -1 = all
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S32 mBytesRead; // bytes read from file
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LLPointer<Responder> mResponder;
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};
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//------------------------------------------------------------------------
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public:
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LLLFSThread(bool threaded = TRUE);
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~LLLFSThread();
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// Return a Request handle
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handle_t read(const std::string& filename, /* Flawfinder: ignore */
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U8* buffer, S32 offset, S32 numbytes,
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Responder* responder, U32 pri=0);
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handle_t write(const std::string& filename,
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U8* buffer, S32 offset, S32 numbytes,
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Responder* responder, U32 pri=0);
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// Misc
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U32 priorityCounter() { return mPriorityCounter-- & PRIORITY_LOWBITS; } // Use to order IO operations
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// static initializers
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static void initClass(bool local_is_threaded = TRUE); // Setup sLocal
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static S32 updateClass(U32 ms_elapsed);
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static void cleanupClass(); // Delete sLocal
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private:
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U32 mPriorityCounter;
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public:
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static LLLFSThread* sLocal; // Default local file thread
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};
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//============================================================================
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#endif // LL_LLLFSTHREAD_H
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