lllfsthread.h
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- /**
- * @file lllfsthread.h
- * @brief LLLFSThread base class
- *
- * $LicenseInfo:firstyear=2000&license=viewergpl$
- *
- * Copyright (c) 2000-2010, 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 "llpointer.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 std::string& 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 std::string& getFilename()
- {
- return mFileName;
- }
-
- /*virtual*/ bool processRequest();
- /*virtual*/ void finishRequest(bool completed);
- /*virtual*/ void deleteRequest();
-
- private:
- LLLFSThread* mThread;
- operation_t mOperation;
-
- std::string 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 std::string& filename, /* Flawfinder: ignore */
- U8* buffer, S32 offset, S32 numbytes,
- Responder* responder, U32 pri=0);
- handle_t write(const std::string& 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