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/****************************************************************************
* *
* PrimeSense Sensor 5.x Alpha *
* Copyright (C) 2011 PrimeSense Ltd. *
* *
* This file is part of PrimeSense Sensor. *
* *
* PrimeSense Sensor is free software: you can redistribute it and/or modify*
* it under the terms of the GNU Lesser General Public License as published *
* by the Free Software Foundation, either version 3 of the License, or *
* (at your option) any later version. *
* *
* PrimeSense Sensor is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU Lesser General Public License for more details. *
* *
* You should have received a copy of the GNU Lesser General Public License *
* along with PrimeSense Sensor. If not, see <http://www.gnu.org/licenses/>.*
* *
****************************************************************************/
//---------------------------------------------------------------------------
// Includes
//---------------------------------------------------------------------------
#include "XnBufferPool.h"
//---------------------------------------------------------------------------
// Code
//---------------------------------------------------------------------------
XnBufferPool::XnBufferPool(XnUInt32 nBufferCount) :
m_nBufferCount(nBufferCount),
m_nBufferSize(0),
m_hLock(NULL),
m_dump(NULL)
{}
XnBufferPool::~XnBufferPool()
{
XnBufferPool::Free();
}
XnStatus XnBufferPool::Init(XnUInt32 nBufferSize)
{
XnStatus nRetVal = XN_STATUS_OK;
m_dump = xnDumpFileOpen("BufferPool", "bufferpool_%x.txt", this);
nRetVal = xnOSCreateCriticalSection(&m_hLock);
XN_IS_STATUS_OK(nRetVal);
// allocate buffers
nRetVal = ChangeBufferSize(nBufferSize);
XN_IS_STATUS_OK(nRetVal);
return (XN_STATUS_OK);
}
void XnBufferPool::Free()
{
if (m_hLock != NULL)
{
xnOSCloseCriticalSection(&m_hLock);
m_hLock = NULL;
}
}
XnStatus XnBufferPool::ChangeBufferSize(XnUInt32 nBufferSize)
{
XnStatus nRetVal = XN_STATUS_OK;
xnDumpFileWriteString(m_dump, "changing buffer size to %d\n", nBufferSize);
xnOSEnterCriticalSection(&m_hLock);
m_nBufferSize = nBufferSize;
nRetVal = AllocateBuffers();
if (nRetVal != XN_STATUS_OK)
{
xnOSLeaveCriticalSection(&m_hLock);
return (nRetVal);
}
xnOSLeaveCriticalSection(&m_hLock);
return (XN_STATUS_OK);
}
void XnBufferPool::FreeAll(XnBool bForceDestroyOfLockedBuffers)
{
// free existing buffers
XnBuffersList::Iterator it = m_AllBuffers.begin();
while (it != m_AllBuffers.end())
{
XnBuffersList::Iterator currIt = it;
// first advance (we might remove this item)
++it;
// now check current
XnBufferInPool* pBuffer = *currIt;
// check if item is in free list (or we're forcing deletion)
if (bForceDestroyOfLockedBuffers || pBuffer->m_nRefCount == 0)
{
DestroyBuffer(pBuffer);
m_AllBuffers.Remove(currIt);
}
else
{
// we can't free it, cause it's still locked. instead, mark it for deletion
pBuffer->m_bDestroy = TRUE;
}
}
m_FreeBuffers.Clear();
}
XnStatus XnBufferPool::GetBuffer(XnBuffer** ppBuffer)
{
XnStatus nRetVal = XN_STATUS_OK;
xnOSEnterCriticalSection(&m_hLock);
XnBuffersList::Iterator it = m_FreeBuffers.begin();
if (it == m_FreeBuffers.end())
{
xnOSLeaveCriticalSection(&m_hLock);
return XN_STATUS_ALLOC_FAILED;
}
XnBufferInPool* pBuffer = *it;
// remove from list
nRetVal = m_FreeBuffers.Remove(it);
if (nRetVal != XN_STATUS_OK)
{
xnOSLeaveCriticalSection(&m_hLock);
return XN_STATUS_ALLOC_FAILED;
}
pBuffer->m_nRefCount = 1;
xnDumpFileWriteString(m_dump, "%u taken from pool\n", pBuffer->m_nID);
xnOSLeaveCriticalSection(&m_hLock);
*ppBuffer = pBuffer;
return (XN_STATUS_OK);
}
void XnBufferPool::AddRef(XnBuffer* pBuffer)
{
if (pBuffer == NULL)
{
return;
}
xnOSEnterCriticalSection(&m_hLock);
XnBufferInPool* pBufferInPool = (XnBufferInPool*)pBuffer;
++pBufferInPool->m_nRefCount;
xnDumpFileWriteString(m_dump, "%u add ref (%d)\n", pBufferInPool->m_nID, pBufferInPool->m_nRefCount);
xnOSLeaveCriticalSection(&m_hLock);
}
void XnBufferPool::DecRef(XnBuffer* pBuffer)
{
if (pBuffer == NULL)
{
return;
}
XnBufferInPool* pBufInPool = (XnBufferInPool*)pBuffer;
xnOSEnterCriticalSection(&m_hLock);
xnDumpFileWriteString(m_dump, "%u dec ref (%d)", pBufInPool->m_nID, pBufInPool->m_nRefCount-1);
if (--pBufInPool->m_nRefCount == 0)
{
if (pBufInPool->m_bDestroy)
{
// remove it from all buffers pool
XnBuffersList::ConstIterator it = m_AllBuffers.Find(pBufInPool);
XN_ASSERT(it != m_AllBuffers.end());
m_AllBuffers.Remove(it);
// and free it
DestroyBuffer(pBufInPool);
xnDumpFileWriteString(m_dump, "destroy!\n");
}
else
{
// return it to free buffers list
m_FreeBuffers.AddLast(pBufInPool);
xnDumpFileWriteString(m_dump, "return to pool!\n");
}
}
else
{
xnDumpFileWriteString(m_dump, "\n");
}
xnOSLeaveCriticalSection(&m_hLock);
}
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