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/**
* @file lllfsthread.cpp
* @brief LLLFSThread base class
*
* $LicenseInfo:firstyear=2001&license=viewergpl$
*
* Copyright (c) 2001-2009, 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.
* $/LicenseInfo$
*/
#include "linden_common.h"
#include "lllfsthread.h"
#include "llstl.h"
#include "llapr.h"
//============================================================================
/*static*/ LLLFSThread* LLLFSThread::sLocal = NULL;
//============================================================================
// Run on MAIN thread
//static
void LLLFSThread::initClass(bool local_is_threaded)
{
llassert(sLocal == NULL);
sLocal = new LLLFSThread(local_is_threaded);
}
//static
S32 LLLFSThread::updateClass(U32 ms_elapsed)
{
sLocal->update(ms_elapsed);
return sLocal->getPending();
}
//static
void LLLFSThread::cleanupClass()
{
sLocal->setQuitting();
while (sLocal->getPending())
{
sLocal->update(0);
}
delete sLocal;
sLocal = 0;
}
//----------------------------------------------------------------------------
LLLFSThread::LLLFSThread(bool threaded) :
LLQueuedThread("LFS", threaded),
mPriorityCounter(PRIORITY_LOWBITS)
{
}
LLLFSThread::~LLLFSThread()
{
// ~LLQueuedThread() will be called here
}
//----------------------------------------------------------------------------
LLLFSThread::handle_t LLLFSThread::read(const std::string& filename, /* Flawfinder: ignore */
U8* buffer, S32 offset, S32 numbytes,
Responder* responder, U32 priority)
{
handle_t handle = generateHandle();
if (priority == 0) priority = PRIORITY_NORMAL | priorityCounter();
else if (priority < PRIORITY_LOW) priority |= PRIORITY_LOW; // All reads are at least PRIORITY_LOW
Request* req = new Request(this, handle, priority,
FILE_READ, filename,
buffer, offset, numbytes,
responder);
bool res = addRequest(req);
if (!res)
{
llerrs << "LLLFSThread::read called after LLLFSThread::cleanupClass()" << llendl;
}
return handle;
}
LLLFSThread::handle_t LLLFSThread::write(const std::string& filename,
U8* buffer, S32 offset, S32 numbytes,
Responder* responder, U32 priority)
{
handle_t handle = generateHandle();
if (priority == 0) priority = PRIORITY_LOW | priorityCounter();
Request* req = new Request(this, handle, priority,
FILE_WRITE, filename,
buffer, offset, numbytes,
responder);
bool res = addRequest(req);
if (!res)
{
llerrs << "LLLFSThread::read called after LLLFSThread::cleanupClass()" << llendl;
}
return handle;
}
//============================================================================
LLLFSThread::Request::Request(LLLFSThread* thread,
handle_t handle, U32 priority,
operation_t op, const std::string& filename,
U8* buffer, S32 offset, S32 numbytes,
Responder* responder) :
QueuedRequest(handle, priority, FLAG_AUTO_COMPLETE),
mThread(thread),
mOperation(op),
mFileName(filename),
mBuffer(buffer),
mOffset(offset),
mBytes(numbytes),
mBytesRead(0),
mResponder(responder)
{
if (numbytes <= 0)
{
llwarns << "LLLFSThread: Request with numbytes = " << numbytes << llendl;
}
}
LLLFSThread::Request::~Request()
{
}
// virtual, called from own thread
void LLLFSThread::Request::finishRequest(bool completed)
{
if (mResponder.notNull())
{
mResponder->completed(completed ? mBytesRead : 0);
mResponder = NULL;
}
}
void LLLFSThread::Request::deleteRequest()
{
if (getStatus() == STATUS_QUEUED)
{
llerrs << "Attempt to delete a queued LLLFSThread::Request!" << llendl;
}
if (mResponder.notNull())
{
mResponder->completed(0);
mResponder = NULL;
}
LLQueuedThread::QueuedRequest::deleteRequest();
}
bool LLLFSThread::Request::processRequest()
{
bool complete = false;
if (mOperation == FILE_READ)
{
llassert(mOffset >= 0);
apr_file_t* filep = ll_apr_file_open(mFileName, LL_APR_RB, mThread->mAPRPoolp);
if (!filep)
{
llwarns << "LLLFS: Unable to read file: " << mFileName << llendl;
mBytesRead = 0; // fail
return true;
}
S32 off;
if (mOffset < 0)
off = ll_apr_file_seek(filep, APR_END, 0);
else
off = ll_apr_file_seek(filep, APR_SET, mOffset);
llassert_always(off >= 0);
mBytesRead = ll_apr_file_read(filep, mBuffer, mBytes );
apr_file_close(filep);
complete = true;
// llinfos << "LLLFSThread::READ:" << mFileName << " Bytes: " << mBytesRead << llendl;
}
else if (mOperation == FILE_WRITE)
{
apr_int32_t flags = APR_CREATE|APR_WRITE|APR_BINARY;
if (mOffset < 0)
flags |= APR_APPEND;
apr_file_t* filep = ll_apr_file_open(mFileName, flags, mThread->mAPRPoolp);
if (!filep)
{
llwarns << "LLLFS: Unable to write file: " << mFileName << llendl;
mBytesRead = 0; // fail
return true;
}
if (mOffset >= 0)
{
S32 seek = ll_apr_file_seek(filep, APR_SET, mOffset);
if (seek < 0)
{
apr_file_close(filep);
llwarns << "LLLFS: Unable to write file (seek failed): " << mFileName << llendl;
mBytesRead = 0; // fail
return true;
}
}
mBytesRead = ll_apr_file_write(filep, mBuffer, mBytes );
complete = true;
apr_file_close(filep);
// llinfos << "LLLFSThread::WRITE:" << mFileName << " Bytes: " << mBytesRead << "/" << mBytes << " Offset:" << mOffset << llendl;
}
else
{
llerrs << "LLLFSThread::unknown operation: " << (S32)mOperation << llendl;
}
return complete;
}
//============================================================================
LLLFSThread::Responder::~Responder()
{
}
//============================================================================
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