]> git.uio.no Git - u/mrichter/AliRoot.git/blobdiff - HLT/BASE/AliHLTDataBuffer.cxx
adding class for handling of CTP information
[u/mrichter/AliRoot.git] / HLT / BASE / AliHLTDataBuffer.cxx
index bb187c866e5d2ee925588cafc63094e73a00b836..a057783b841f528ea724c1736063e922906fe45e 100644 (file)
@@ -1,19 +1,20 @@
 // $Id$
 
-/**************************************************************************
- * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
- *                                                                        *
- * Authors: Matthias Richter <Matthias.Richter@ift.uib.no>                *
- *          for The ALICE Off-line Project.                               *
- *                                                                        *
- * Permission to use, copy, modify and distribute this software and its   *
- * documentation strictly for non-commercial purposes is hereby granted   *
- * without fee, provided that the above copyright notice appears in all   *
- * copies and that both the copyright notice and this permission notice   *
- * appear in the supporting documentation. The authors make no claims     *
- * about the suitability of this software for any purpose. It is          *
- * provided "as is" without express or implied warranty.                  *
- **************************************************************************/
+//**************************************************************************
+//* This file is property of and copyright by the ALICE HLT Project        * 
+//* ALICE Experiment at CERN, All rights reserved.                         *
+//*                                                                        *
+//* Primary Authors: Matthias Richter <Matthias.Richter@ift.uib.no>        *
+//*                  for The ALICE HLT Project.                            *
+//*                                                                        *
+//* Permission to use, copy, modify and distribute this software and its   *
+//* documentation strictly for non-commercial purposes is hereby granted   *
+//* without fee, provided that the above copyright notice appears in all   *
+//* copies and that both the copyright notice and this permission notice   *
+//* appear in the supporting documentation. The authors make no claims     *
+//* about the suitability of this software for any purpose. It is          *
+//* provided "as is" without express or implied warranty.                  *
+//**************************************************************************
 
 /** @file   AliHLTDataBuffer.cxx
     @author Matthias Richter
@@ -26,115 +27,16 @@ using namespace std;
 #endif
 
 #include "AliHLTDataBuffer.h"
+#include "AliHLTConsumerDescriptor.h"
 #include "AliHLTComponent.h"
-#include <string>
-#include "AliHLTSystem.h"
+#include "AliHLTTask.h"
+#include <cerrno>
+#include <cassert>
+//#include <string>
+//#include "AliHLTSystem.h"
 
-AliHLTConsumerDescriptor::AliHLTConsumerDescriptor()
-  :
-  fpConsumer(NULL),
-  fSegments()
-{
-  // see header file for class documentation
-  // or
-  // refer to README to build package
-  // or
-  // visit http://web.ift.uib.no/~kjeks/doc/alice-hlt
-  fSegments.clear();
-}
-
-AliHLTConsumerDescriptor::AliHLTConsumerDescriptor(AliHLTComponent* pConsumer)
-  :
-  fpConsumer(pConsumer),
-  fSegments()
-{
-  // see header file for function documentation
-  fSegments.clear();
-}
-
-AliHLTConsumerDescriptor::AliHLTConsumerDescriptor(const AliHLTConsumerDescriptor& desc)
-  :
-  TObject(),
-  AliHLTLogging(),
-  fpConsumer(desc.fpConsumer),
-  fSegments()
-{
-  // see header file for function documentation
-
-  // we can simply transfer the pointer to th new object since there are no
-  // release actions in the destructor
-}
-
-AliHLTConsumerDescriptor& AliHLTConsumerDescriptor::operator=(const AliHLTConsumerDescriptor& desc)
-{ 
-  // see header file for function documentation
-
-  // we can simply transfer the pointer to th new object since there are no
-  // release actions in the destructor
-  fpConsumer=desc.fpConsumer;
-  return *this;
-}
-
-AliHLTConsumerDescriptor::~AliHLTConsumerDescriptor()
-{
-  // see header file for function documentation
-  if (fSegments.size()>0) {
-    //HLTWarning("unreleased data segments found");
-  }
-}
-
-int AliHLTConsumerDescriptor::SetActiveDataSegment(AliHLTUInt32_t offset, AliHLTUInt32_t size)
-{
-  // see header file for function documentation
-  int iResult=0;
-  AliHLTDataSegment segment(offset, size);
-  fSegments.push_back(segment);
-  //HLTDebug("set active segment (%d:%d) for consumer %p", offset, size, this);
-  return iResult;
-}
-
-int AliHLTConsumerDescriptor::CheckActiveDataSegment(AliHLTUInt32_t offset, AliHLTUInt32_t size)
-{
-  // see header file for function documentation
-  int iResult=0;
-  if (fSegments.size()>0) {
-    vector<AliHLTDataSegment>::iterator segment=fSegments.begin();
-    while (segment!=fSegments.end()) {
-      if ((iResult=((*segment).fSegmentOffset==offset && (*segment).fSegmentSize==size))>0) {
-       break;
-      }
-      segment++;
-    }
-  } else {
-    //HLTWarning("no data segment active for consumer %p", this);
-    iResult=-ENODATA;
-  }
-  return iResult;
-}
-
-int AliHLTConsumerDescriptor::ReleaseActiveDataSegment(AliHLTUInt32_t offset, AliHLTUInt32_t size)
-{
-  // see header file for function documentation
-  int iResult=0;
-  if (fSegments.size()>0) {
-    vector<AliHLTDataSegment>::iterator segment=fSegments.begin();
-    while (segment!=fSegments.end()) {
-      if ((iResult=((*segment).fSegmentOffset==offset && (*segment).fSegmentSize==size))>0) {
-       fSegments.erase(segment);
-       break;
-      }
-      segment++;
-    }
-    if (iResult==0) {
-      //HLTWarning("no data segment (%d:%d) active for consumer %p", offset, size, this);
-      iResult=-ENOENT;
-    }
-  } else {
-    //HLTWarning("no data segment active for consumer %p", this);
-    iResult=-ENODATA;
-  }
-  return iResult;
-}
+typedef vector<AliHLTDataBuffer::AliHLTDataSegment> AliHLTDataSegmentList;
+typedef vector<AliHLTDataBuffer::AliHLTRawBuffer*>  AliHLTRawBufferPList;
 
 /** ROOT macro for the implementation of ROOT specific class methods */
 ClassImp(AliHLTDataBuffer)
@@ -146,7 +48,9 @@ AliHLTDataBuffer::AliHLTDataBuffer()
   fActiveConsumers(),
   fReleasedConsumers(),
   fpBuffer(NULL),
-  fFlags(0)
+  fFlags(0),
+  fForwardedSegmentSources(),
+  fForwardedSegments()
 {
   // see header file for class documentation
   // or
@@ -160,33 +64,14 @@ AliHLTDataBuffer::AliHLTDataBuffer()
   fgNofInstances++;
 }
 
-AliHLTDataBuffer::AliHLTDataBuffer(const AliHLTDataBuffer&)
-  :
-  TObject(),
-  AliHLTLogging(),
-  fSegments(),
-  fConsumers(),
-  fActiveConsumers(),
-  fReleasedConsumers(),
-  fpBuffer(NULL),
-  fFlags(0)
-{
-  // see header file for function documentation
-  HLTFatal("copy constructor untested");
-}
-
-AliHLTDataBuffer& AliHLTDataBuffer::operator=(const AliHLTDataBuffer&)
-{ 
-  // see header file for function documentation
-  HLTFatal("assignment operator untested");
-  return *this;
-}
-
 int AliHLTDataBuffer::fgNofInstances=0;
-vector<AliHLTRawBuffer*> AliHLTDataBuffer::fgFreeBuffers;
-vector<AliHLTRawBuffer*> AliHLTDataBuffer::fgActiveBuffers;
+AliHLTRawBufferPList AliHLTDataBuffer::fgFreeBuffers;
+AliHLTRawBufferPList AliHLTDataBuffer::fgActiveBuffers;
 AliHLTUInt32_t AliHLTDataBuffer::fgMargin=1024;
 AliHLTLogging AliHLTDataBuffer::fgLogging;
+const Int_t AliHLTDataBuffer::fgkSafetyPatternSize=16;
+const char AliHLTDataBuffer::fgkSafetyPattern[]={0x28, 0x63, 0x29, 0x4d, 0x52, 0x49, 0x43, 0x48, 0x54, 0x45, 0x52, 0x20, 0x32, 0x30, 0x30, 0x37};
+AliHLTUInt32_t AliHLTDataBuffer::fgEventCount=0;
 
 AliHLTDataBuffer::~AliHLTDataBuffer()
 {
@@ -220,15 +105,15 @@ int AliHLTDataBuffer::SetConsumer(AliHLTComponent* pConsumer)
   return iResult;
 }
 
-int AliHLTDataBuffer::FindMatchingDataBlocks(const AliHLTComponent* pConsumer, vector<AliHLTComponentDataType>* tgtList)
+int AliHLTDataBuffer::FindMatchingDataBlocks(const AliHLTComponent* pConsumer, AliHLTComponentDataTypeList* tgtList)
 {
   // see header file for function documentation
   int iResult=0;
   if (pConsumer) {
-    vector<AliHLTDataSegment> segments;
+    AliHLTDataSegmentList segments;
     if ((iResult=FindMatchingDataSegments(pConsumer, segments))>=0) {
       if (tgtList) {
-       vector<AliHLTDataSegment>::iterator segment=segments.begin();
+       AliHLTDataSegmentList::iterator segment=segments.begin();
        while (segment!=segments.end()) {
          tgtList->push_back((*segment).fDataType);
          segment++;
@@ -242,19 +127,29 @@ int AliHLTDataBuffer::FindMatchingDataBlocks(const AliHLTComponent* pConsumer, v
   return iResult;
 }
 
-int AliHLTDataBuffer::FindMatchingDataSegments(const AliHLTComponent* pConsumer, vector<AliHLTDataSegment>& tgtList)
+int AliHLTDataBuffer::FindMatchingDataSegments(const AliHLTComponent* pConsumer, vector<AliHLTDataBuffer::AliHLTDataSegment>& tgtList)
 {
   // see header file for function documentation
   int iResult=0;
+
+  // Matthias 26.09.2007 relax the restriction to matching data blocks
+  // all blocks are passed to the consumer, which is the policy also in
+  // PubSub
+  tgtList.assign(fSegments.begin(), fSegments.end());
+
+  // add all forwarded blocks
+  tgtList.insert(tgtList.begin(), fForwardedSegments.begin(), fForwardedSegments.end());
+  iResult=tgtList.size();
+  return iResult;
+  
   if (pConsumer) {
-    vector<AliHLTComponentDataType> dtlist;
+    AliHLTComponentDataTypeList dtlist;
     ((AliHLTComponent*)pConsumer)->GetInputDataTypes(dtlist);
-    vector<AliHLTDataSegment>::iterator segment=fSegments.begin();
+    AliHLTDataSegmentList::iterator segment=fSegments.begin();
     while (segment!=fSegments.end()) {
-      vector<AliHLTComponentDataType>::iterator type=dtlist.begin();
+      AliHLTComponentDataTypeList::iterator type=dtlist.begin();
       while (type!=dtlist.end()) {
-       if ((*segment).fDataType==(*type) ||
-           (*type)==kAliHLTAnyDataType) {
+       if ((*segment).fDataType==(*type)) {
          tgtList.push_back(*segment);
          iResult++;
          break;
@@ -269,45 +164,55 @@ int AliHLTDataBuffer::FindMatchingDataSegments(const AliHLTComponent* pConsumer,
   return iResult;
 }
 
-int AliHLTDataBuffer::Subscribe(const AliHLTComponent* pConsumer, AliHLTComponentBlockData* arrayBlockDesc, int iArraySize)
+int AliHLTDataBuffer::Subscribe(const AliHLTComponent* pConsumer, AliHLTComponentBlockDataList& blockDescList)
 {
   // see header file for function documentation
   int iResult=0;
-  if (pConsumer && arrayBlockDesc) {
-    if (fpBuffer) {
+  if (pConsumer) {
+    if (1/*fpBuffer*/) {
       AliHLTConsumerDescriptor* pDesc=FindConsumer(pConsumer, fConsumers);
       if (pDesc) {
-       vector<AliHLTDataSegment> tgtList;
-       /* TODO: think about a good policy for this check
-        * is it enough that at least one segment is available, or have all to be available?
-        * or is it possible to have optional segments?
-        */
-       if ((iResult=FindMatchingDataSegments(pConsumer, tgtList))>0) {
-         int i =0;
-         vector<AliHLTDataSegment>::iterator segment=tgtList.begin();
-         while (segment!=tgtList.end() && i<iArraySize) {
+       AliHLTDataSegmentList tgtList;
+       // Matthias 26.07.2007 AliHLTSystem should behave the same way as PubSub
+       // so it does not matter if there are matching data types or not, unless
+       // we implement such a check in PubSub
+       if ((iResult=FindMatchingDataSegments(pConsumer, tgtList))>=0) {
+         AliHLTDataSegmentList::iterator segment=tgtList.begin();
+         while (segment!=tgtList.end()) {
            // fill the block data descriptor
-           arrayBlockDesc[i].fStructSize=sizeof(AliHLTComponentBlockData);
-           // the shared memory key is not used in AliRoot
-           arrayBlockDesc[i].fShmKey.fStructSize=sizeof(AliHLTComponentShmData);
-           arrayBlockDesc[i].fShmKey.fShmType=gkAliHLTComponentInvalidShmType;
-           arrayBlockDesc[i].fShmKey.fShmID=gkAliHLTComponentInvalidShmID;
-           arrayBlockDesc[i].fOffset=(*segment).fSegmentOffset;
-           arrayBlockDesc[i].fPtr=fpBuffer->fPtr;
-           arrayBlockDesc[i].fSize=(*segment).fSegmentSize;
-           arrayBlockDesc[i].fDataType=(*segment).fDataType;
-           arrayBlockDesc[i].fSpecification=(*segment).fSpecification;
-           pDesc->SetActiveDataSegment(arrayBlockDesc[i].fOffset, arrayBlockDesc[i].fSize);
-           HLTDebug("component %p (%s) subscribed to segment #%d offset %d", pConsumer, ((AliHLTComponent*)pConsumer)->GetComponentID(), i, arrayBlockDesc[i].fOffset);
-           i++;
+           AliHLTComponentBlockData bd;
+           AliHLTComponent::FillBlockData(bd);
+           // This models the behavior of PubSub.
+           // For incoming data blocks, fOffset must be ignored by the
+           // processing component. It is set for bookkeeping in the framework.
+           // fPtr always points to the beginning of the data.
+           bd.fOffset=0;
+           AliHLTUInt8_t* pTgt=*segment;
+           bd.fPtr=reinterpret_cast<void*>(pTgt);
+           bd.fSize=(*segment).fSegmentSize;
+           bd.fDataType=(*segment).fDataType;
+           bd.fSpecification=(*segment).fSpecification;
+           blockDescList.push_back(bd);
+           pDesc->SetActiveDataSegment(*segment);
+           HLTDebug("component %p (%s) subscribed to segment offset %d size %d data type %s %#x", 
+                    pConsumer, ((AliHLTComponent*)pConsumer)->GetComponentID(), bd.fOffset,
+                    bd.fSize, (AliHLTComponent::DataType2Text(bd.fDataType)).c_str(), 
+                    bd.fSpecification);
            segment++;
          }
          // move this consumer to the active list
-         if (ChangeConsumerState(pDesc, fConsumers, fActiveConsumers)>=0) {
+         if (tgtList.size()==0) {
+           ChangeConsumerState(pDesc, fConsumers, fReleasedConsumers);
+           HLTDebug("no input data for component %p (%s) available", pConsumer, ((AliHLTComponent*)pConsumer)->GetComponentID());
+         } else if (ChangeConsumerState(pDesc, fConsumers, fActiveConsumers)>=0) {
            HLTDebug("component %p (%s) subscribed to data buffer %p", pConsumer, ((AliHLTComponent*)pConsumer)->GetComponentID(), this);
          } else {
            // TODO: cleanup the consumer descriptor correctly
-           memset(arrayBlockDesc, 0, iArraySize*sizeof(AliHLTComponentBlockData));
+           segment=tgtList.begin();
+           while (segment!=tgtList.end()) {
+             blockDescList.pop_back();
+             segment++;
+           }
            HLTError("can not activate consumer %p for data buffer %p", pConsumer, this);
            iResult=-EACCES;
          }
@@ -316,12 +221,19 @@ int AliHLTDataBuffer::Subscribe(const AliHLTComponent* pConsumer, AliHLTComponen
          iResult=-EBADF;
        }
       } else {
-       HLTError("component %p is not a data consumer of data buffer %s", pConsumer, this);
+       if (!FindConsumer(pConsumer)) {
+         HLTError("component %p is not a data consumer of data buffer %p", pConsumer, this);
+       } else {
+         HLTError("component %p is a valid data consumer of data buffer %p, but did not release it's buffer subscription", pConsumer, this);
+       }
        iResult=-ENOENT;
       }
     } else {
-      HLTError("data buffer %p is empty", this);
-      iResult=-ENODATA;
+      // Matthias 26.07.2007 until now, data had to be present for successful subscription
+      // in order to be consistent with the PubSub framework, this restiction has been
+      // removed
+      //HLTError("data buffer %p is empty", this);
+      //iResult=-ENODATA;
     }
   } else {
     HLTError("invalid parameter");
@@ -330,26 +242,32 @@ int AliHLTDataBuffer::Subscribe(const AliHLTComponent* pConsumer, AliHLTComponen
   return iResult;
 }
 
-int AliHLTDataBuffer::Release(AliHLTComponentBlockData* pBlockDesc, const AliHLTComponent* pConsumer)
+int AliHLTDataBuffer::Release(AliHLTComponentBlockData* pBlockDesc,
+                             const AliHLTComponent* pConsumer,
+                             const AliHLTTask* pOwnerTask)
 {
   // see header file for function documentation
   int iResult=0;
   if (pBlockDesc && pConsumer) {
     AliHLTConsumerDescriptor* pDesc=FindConsumer(pConsumer, fActiveConsumers);
     if (pDesc) {
-      if ((iResult=pDesc->CheckActiveDataSegment(pBlockDesc->fOffset, pBlockDesc->fSize))!=1) {
-       HLTWarning("data segment missmatch, component %p has not subscribed to a segment with offset %#x and size %d", pConsumer, pBlockDesc->fOffset, pBlockDesc->fSize);
+      if ((iResult=pDesc->CheckActiveDataSegment(AliHLTDataSegment(pBlockDesc->fPtr, pBlockDesc->fOffset, pBlockDesc->fSize)))!=1) {
+       HLTWarning("data segment mismatch, component %p has not subscribed to a segment with offset %#x and size %d", pConsumer, pBlockDesc->fOffset, pBlockDesc->fSize);
        // TODO: appropriate error handling, but so far optional
        iResult=0;
       } else {
-       pDesc->ReleaseActiveDataSegment(pBlockDesc->fOffset, pBlockDesc->fSize);
-       pBlockDesc->fOffset=0;
-       pBlockDesc->fPtr=NULL;
-       pBlockDesc->fSize=0;
+       pDesc->ReleaseActiveDataSegment(AliHLTDataSegment(pBlockDesc->fPtr, pBlockDesc->fOffset, pBlockDesc->fSize));
       }
+      if (GetNofPendingConsumers()==0 && fForwardedSegments.size()>0) {
+       // last consumer, release forwarded segments
+       ReleaseForwardedBlock(pBlockDesc, pOwnerTask);
+      }
+      pBlockDesc->fOffset=0;
+      pBlockDesc->fPtr=NULL;
+      pBlockDesc->fSize=0;
       if (pDesc->GetNofActiveSegments()==0) {
        if ((iResult=ChangeConsumerState(pDesc, fActiveConsumers, fReleasedConsumers))>=0) {
-         if (GetNofActiveConsumers()==0) {
+         if (GetNofActiveConsumers()==0 && GetNofPendingConsumers()==0) {
            // this is the last consumer, reset the consumer list and release the raw buffer
            ResetDataBuffer();
          }
@@ -369,13 +287,66 @@ int AliHLTDataBuffer::Release(AliHLTComponentBlockData* pBlockDesc, const AliHLT
   return iResult;
 }
 
+int AliHLTDataBuffer::ReleaseForwardedBlock(AliHLTComponentBlockData* pBlockDesc,
+                                           const AliHLTTask* pOwnerTask)
+{
+  // see header file for function documentation
+  int iResult=0;
+  if (pBlockDesc && pOwnerTask) {
+       assert(fForwardedSegments.size()==fForwardedSegmentSources.size());
+       AliHLTDataSegmentList::iterator segment=fForwardedSegments.begin();
+       AliHLTTaskPList::iterator src=fForwardedSegmentSources.begin();
+       //HLTDebug("%p checking forwarded segments", this);
+       for (; segment!=fForwardedSegments.end(); segment++, src++) {
+         //HLTDebug("segment ptr=%p offset=%d size=%d\n"
+         //   "block ptr=%p offset=%d size=%d", (*segment).fPtr, (*segment).fSegmentOffset, (*segment).fSegmentSize, pBlockDesc->fPtr, pBlockDesc->fOffset, pBlockDesc->fSize);
+         if ((*segment)==AliHLTDataSegment(pBlockDesc->fPtr, pBlockDesc->fOffset, pBlockDesc->fSize)) {
+           //HLTDebug("release segment of task %p", *src);
+           assert((*src)!=NULL);
+           if ((*src)!=NULL) {
+             if ((*src)->Release(pBlockDesc, pOwnerTask)>=0) {
+               HLTDebug("task %s (%p) released forwarded segment %p size %d of task %s (%p)",
+                        pOwnerTask->GetName(), pOwnerTask, (*segment).GetPtr(), (*segment).GetSize(),
+                        (*src)->GetName(), *src);
+             } else {
+               HLTError("task %s (%p) failed releasing forwarded segment %p size %d of task %s (%p)",
+                        pOwnerTask->GetName(), pOwnerTask, (*segment).GetPtr(), (*segment).GetSize(),
+                        (*src)->GetName(), *src);
+             }
+           }
+           fForwardedSegments.erase(segment);
+           fForwardedSegmentSources.erase(src);
+           break;
+         }
+       }
+  } else {
+    HLTError("inavalid parameter: pBlockDesc=%p pOwnerTask=%p", pBlockDesc, pOwnerTask);
+    iResult=-EINVAL;
+  }
+  return iResult;
+}
+
+int AliHLTDataBuffer::Forward(AliHLTTask* pSrcTask, AliHLTComponentBlockData* pBlockDesc)
+{
+  // see header file for function documentation
+  if (pSrcTask==NULL || pBlockDesc==NULL) return -EINVAL;
+  assert(fForwardedSegments.size()==fForwardedSegmentSources.size());
+  if (fForwardedSegments.size()!=fForwardedSegmentSources.size()) return -EFAULT;
+  fForwardedSegmentSources.push_back(pSrcTask);
+  fForwardedSegments.push_back(AliHLTDataSegment(pBlockDesc->fPtr, pBlockDesc->fOffset, pBlockDesc->fSize, pBlockDesc->fDataType, pBlockDesc->fSpecification));
+  return 0;
+}
+
 AliHLTUInt8_t* AliHLTDataBuffer::GetTargetBuffer(int iMinSize)
 {
   // see header file for function documentation
   AliHLTUInt8_t* pTargetBuffer=NULL;
+  if (fpBuffer!=NULL) {
+    HLTWarning("data buffer not properly reset, possible memory leak\n");
+  }
   fpBuffer=CreateRawBuffer(iMinSize);
   if (fpBuffer) {
-    pTargetBuffer=(AliHLTUInt8_t*)fpBuffer->fPtr;
+    pTargetBuffer=*fpBuffer;
   } else {
     HLTError("can not create raw buffer");
   }
@@ -388,27 +359,44 @@ int AliHLTDataBuffer::SetSegments(AliHLTUInt8_t* pTgt, AliHLTComponentBlockData*
   int iResult=0;
   if (pTgt && arrayBlockData && iSize>=0) {
     if (fpBuffer) {
-      if (fpBuffer->fPtr==(void*)pTgt) {
-       AliHLTDataSegment segment;
-       memset(&segment, 0, sizeof(AliHLTDataSegment));
+      if (*fpBuffer==pTgt) {
+       AliHLTDataBuffer::AliHLTDataSegment segment;
        for (int i=0; i<iSize; i++) {
-         if (arrayBlockData[i].fOffset+arrayBlockData[i].fSize<=fpBuffer->fSize) {
-           segment.fSegmentOffset=arrayBlockData[i].fOffset;
-           segment.fSegmentSize=arrayBlockData[i].fSize;
-           segment.fDataType=arrayBlockData[i].fDataType;
-           segment.fSpecification=arrayBlockData[i].fSpecification;
-           fSegments.push_back(segment);
-           HLTDebug("set segment %s with size %d at offset %d", AliHLTComponent::DataType2Text(segment.fDataType).data(), segment.fSegmentSize, segment.fSegmentOffset);
+         // This function has to model the behavior of PubSub
+         // For output blocks only the fOffset value is used, this must be the offset
+         // relative to the output pointer. fPtr must be either NULL or the output
+         // pointer. In either case it is 'ignored' and set to the beginning of the
+         // data buffer
+         if (arrayBlockData[i].fPtr==NULL ||
+             arrayBlockData[i].fPtr==*fpBuffer) {
+           arrayBlockData[i].fPtr=*fpBuffer;
+           if ((arrayBlockData[i].fOffset+arrayBlockData[i].fSize<=fpBuffer->GetUsedSize()) ||
+               ((arrayBlockData[i].fOffset==~(AliHLTUInt32_t)0) && arrayBlockData[i].fSize==0)) {
+             segment.fSegmentOffset=arrayBlockData[i].fOffset;
+             segment.fPtr=(AliHLTUInt8_t*)arrayBlockData[i].fPtr;
+             segment.fSegmentSize=arrayBlockData[i].fSize;
+             segment.fDataType=arrayBlockData[i].fDataType;
+             segment.fSpecification=arrayBlockData[i].fSpecification;
+             fSegments.push_back(segment);
+             HLTDebug("set segment %s with size %d at offset %d", AliHLTComponent::DataType2Text(segment.fDataType).data(), segment.fSegmentSize, segment.fSegmentOffset);
+           } else {
+             HLTError("block data specification %#d (%s) exceeds size of data buffer", i, AliHLTComponent::DataType2Text(arrayBlockData[i].fDataType).data());
+             HLTError("block offset=%d, block size=%d, buffer size=%d", arrayBlockData[i].fOffset, arrayBlockData[i].fSize, fpBuffer->GetUsedSize());
+             iResult=-E2BIG;
+           }
          } else {
-           HLTError("block data specification %#d (%s) exceeds size of data buffer", i, AliHLTComponent::DataType2Text(arrayBlockData[i].fDataType).data());
-           HLTError("block offset=%d, block size=%d, buffer size=%d", arrayBlockData[i].fOffset, arrayBlockData[i].fSize, fpBuffer->fSize);
+           HLTError("invalid pointer (%p) in block data specification (buffer %p size %d)."
+                    "please note: for output blocks only the fOffset value is valid and must "
+                    "be relative to the output buffer", arrayBlockData[i].fPtr, fpBuffer->GetPointer(), fpBuffer->GetUsedSize());
+           iResult=-ERANGE;
          }
        }
       } else {
-       HLTError("this data buffer (%p) does not match the internal data buffer %p of raw buffer %p", pTgt, fpBuffer->fPtr, fpBuffer);
+       HLTError("this data buffer (%p) does not match the internal data buffer %p of raw buffer %p", pTgt, fpBuffer->GetPointer(), fpBuffer);
+       iResult=-EINVAL;
       }
     } else {
-      HLTFatal("internal data structur missmatch");
+      HLTFatal("internal data structur mismatch");
       iResult=-EFAULT;
     }
   } else {
@@ -421,14 +409,14 @@ int AliHLTDataBuffer::SetSegments(AliHLTUInt8_t* pTgt, AliHLTComponentBlockData*
 int AliHLTDataBuffer::IsEmpty()
 {
   // see header file for function documentation
-  int iResult=fpBuffer==NULL || GetNofSegments()==0;
+  int iResult=(fpBuffer==NULL && fForwardedSegments.size()==0) || GetNofSegments()==0;
   return iResult;
 }
 
 int AliHLTDataBuffer::GetNofSegments()
 {
   // see header file for function documentation
-  int iResult=fSegments.size();
+  int iResult=fSegments.size() + fForwardedSegments.size();
   return iResult;
 }
 
@@ -439,6 +427,13 @@ int AliHLTDataBuffer::GetNofConsumers()
   return iResult;
 }
 
+int AliHLTDataBuffer::GetNofPendingConsumers()
+{
+  // see header file for function documentation
+  int iResult=fConsumers.size();
+  return iResult;
+}
+
 int AliHLTDataBuffer::GetNofActiveConsumers()
 {
   // see header file for function documentation
@@ -446,18 +441,19 @@ int AliHLTDataBuffer::GetNofActiveConsumers()
   return iResult;
 }
 
-AliHLTRawBuffer* AliHLTDataBuffer::CreateRawBuffer(AliHLTUInt32_t size)
+AliHLTDataBuffer::AliHLTRawBuffer* AliHLTDataBuffer::CreateRawBuffer(AliHLTUInt32_t size)
 {
   // see header file for function documentation
   AliHLTRawBuffer* pRawBuffer=NULL;
-  vector<AliHLTRawBuffer*>::iterator buffer=fgFreeBuffers.begin();
+  unsigned int reqSize=size+fgkSafetyPatternSize;
+  AliHLTRawBufferPList::iterator buffer=fgFreeBuffers.begin();
   while (buffer!=fgFreeBuffers.end() && pRawBuffer==NULL) {
-    if ((*buffer)->fTotalSize>=size && ((*buffer)->fTotalSize-size)<fgMargin) {
+    if ((*buffer)->CheckSize(reqSize)) {
       // assign this element
       pRawBuffer=*buffer;
-      pRawBuffer->fSize=size;
+      pRawBuffer->UseBuffer(size);
       fgFreeBuffers.erase(buffer);
-      fgLogging.Logging(kHLTLogDebug, "AliHLTDataBuffer::CreateRawBuffer", "data buffer handling", "raw buffer container %p provided for request of %d bytes (total %d available in buffer %p)", pRawBuffer, size, pRawBuffer->fTotalSize, pRawBuffer->fPtr);
+      fgLogging.Logging(kHLTLogDebug, "AliHLTDataBuffer::CreateRawBuffer", "data buffer handling", "raw buffer container %p provided for request of %d bytes (total %d available in buffer %p)", pRawBuffer, size, pRawBuffer->GetTotalSize(), pRawBuffer->GetPointer());
       fgActiveBuffers.push_back(pRawBuffer);
       break;
     }
@@ -465,15 +461,12 @@ AliHLTRawBuffer* AliHLTDataBuffer::CreateRawBuffer(AliHLTUInt32_t size)
   }
   if (pRawBuffer==NULL) {
     // no buffer found, create a new one
-    pRawBuffer=new AliHLTRawBuffer;
+    pRawBuffer=new AliHLTRawBuffer(reqSize);
     if (pRawBuffer) {
-      memset(pRawBuffer, 0, sizeof(AliHLTRawBuffer));
-      pRawBuffer->fPtr=malloc(size);
-      if (pRawBuffer->fPtr) {
-       pRawBuffer->fSize=size;
-       pRawBuffer->fTotalSize=size;
+      if (pRawBuffer->GetPointer()) {
+       pRawBuffer->UseBuffer(size);
        fgActiveBuffers.push_back(pRawBuffer);
-       fgLogging.Logging(kHLTLogDebug, "AliHLTDataBuffer::CreateRawBuffer", "data buffer handling", "new raw buffer %p of size %d created (container %p)", pRawBuffer->fPtr, pRawBuffer->fTotalSize, pRawBuffer);
+       fgLogging.Logging(kHLTLogDebug, "AliHLTDataBuffer::CreateRawBuffer", "data buffer handling", "new raw buffer %p of size %d created (container %p)", pRawBuffer->GetPointer(), pRawBuffer->GetTotalSize(), pRawBuffer);
       } else {
        delete pRawBuffer;
        pRawBuffer=NULL;
@@ -483,6 +476,10 @@ AliHLTRawBuffer* AliHLTDataBuffer::CreateRawBuffer(AliHLTUInt32_t size)
       fgLogging.Logging(kHLTLogError, "AliHLTDataBuffer::CreateRawBuffer", "data buffer handling", "memory allocation failed");
     }
   }
+  if (pRawBuffer!=NULL && fgkSafetyPatternSize>0) {
+    //fgLogging.Logging(kHLTLogDebug, "AliHLTDataBuffer::CreateRawBuffer", "data buffer handling", "writing safety pattern to %p offset %d", (*buffer)->GetPointer(), (*buffer)->GetUsedSize());
+    pRawBuffer->WritePattern(fgkSafetyPattern, fgkSafetyPatternSize);
+  }
   return pRawBuffer;
 }
 
@@ -491,12 +488,18 @@ int AliHLTDataBuffer::ReleaseRawBuffer(AliHLTRawBuffer* pBuffer)
   // see header file for function documentation
   int iResult=0;
   if (pBuffer) {
-    vector<AliHLTRawBuffer*>::iterator buffer=fgActiveBuffers.begin();
+    AliHLTRawBufferPList::iterator buffer=fgActiveBuffers.begin();
     while (buffer!=fgActiveBuffers.end() && (*buffer)!=pBuffer) {
       buffer++;
     }
     if (buffer!=fgActiveBuffers.end()) {
-      (*buffer)->fSize=0;
+      if (fgkSafetyPatternSize>0) {
+       //fgLogging.Logging(kHLTLogDebug, "AliHLTDataBuffer::ReleaseRawBuffer", "data buffer handling", "comparing safety pattern at %p offset %d", (*buffer)->GetPointer(), reinterpret_cast<AliHLTUInt32_t>(*buffer));
+       if ((*buffer)->CheckPattern(fgkSafetyPattern, fgkSafetyPatternSize)) {
+         fgLogging.Logging(kHLTLogFatal, "AliHLTDataBuffer::ReleaseRawBuffer", "data buffer handling", "component has written beyond end of data buffer %p size %d", (*buffer)->GetPointer(), (*buffer)->GetUsedSize());
+       }
+      }
+      (*buffer)->Reset();
       fgFreeBuffers.push_back(*buffer);
       fgActiveBuffers.erase(buffer);
     } else {
@@ -515,29 +518,54 @@ int AliHLTDataBuffer::DeleteRawBuffers()
 {
   // see header file for function documentation
   int iResult=0;
-  vector<AliHLTRawBuffer*>::iterator buffer=fgFreeBuffers.begin();
-  while (buffer!=fgFreeBuffers.end()) {
-    free((*buffer)->fPtr);
+#ifdef ALIHLTSYSTEM_PROFILING
+  int iTotalSize=0;
+  int iCount=fgFreeBuffers.size()+fgActiveBuffers.size();
+#endif //ALIHLTSYSTEM_PROFILING
+  AliHLTRawBufferPList::iterator buffer;;
+  while ((buffer=fgFreeBuffers.begin())!=fgFreeBuffers.end()) {
+#ifdef ALIHLTSYSTEM_PROFILING
+    iTotalSize+=(*buffer)->GetTotalSize();
+#endif //ALIHLTSYSTEM_PROFILING
     delete *buffer;
     fgFreeBuffers.erase(buffer);
-    buffer=fgFreeBuffers.begin();
   }
-  buffer=fgActiveBuffers.begin();
-  while (buffer!=fgActiveBuffers.end()) {
-    fgLogging.Logging(kHLTLogWarning, "AliHLTDataBuffer::ReleaseRawBuffer", "data buffer handling", "request to delete active raw buffer container (raw buffer %p, size %d)", (*buffer)->fPtr, (*buffer)->fTotalSize);
-    free((*buffer)->fPtr);
+  while ((buffer=fgActiveBuffers.begin())!=fgActiveBuffers.end()) {
+#ifdef ALIHLTSYSTEM_PROFILING
+    iTotalSize+=(*buffer)->GetTotalSize();
+#endif //ALIHLTSYSTEM_PROFILING
+    fgLogging.Logging(kHLTLogWarning, "AliHLTDataBuffer::ReleaseRawBuffer", "data buffer handling", "request to delete active raw buffer container (raw buffer %p, size %d)", (*buffer)->GetPointer(), (*buffer)->GetTotalSize());
     delete *buffer;
     fgActiveBuffers.erase(buffer);
-    buffer=fgActiveBuffers.begin();
   }
+#ifdef ALIHLTSYSTEM_PROFILING
+  fgLogging.Logging(kHLTLogImportant, "AliHLTDataBuffer::ReleaseRawBuffer", "data buffer handling", "Total memory allocation: %d byte in %d buffers", iTotalSize, iCount);
+#endif //ALIHLTSYSTEM_PROFILING
+  return iResult;
+}
+
+int AliHLTDataBuffer::PrintStatistics() 
+{
+  // see header file for function documentation
+  int iResult=0;
+  int iFree=0;
+  int iActive=0;
+  AliHLTRawBufferPList::iterator buffer;;
+  for (buffer=fgFreeBuffers.begin(); buffer!=fgFreeBuffers.end(); buffer++) {
+    iFree+=(*buffer)->GetTotalSize();
+  }
+  for (buffer=fgActiveBuffers.begin(); buffer!=fgActiveBuffers.end(); buffer++) {
+    iActive+=(*buffer)->GetTotalSize();
+  }
+  fgLogging.Logging(kHLTLogInfo, "AliHLTDataBuffer::PrintStatistics", "data buffer handling", "Total memory allocation: %d byte; %d free buffers (%d byte) - %d active buffers (%d byte) ", iFree+iActive, fgFreeBuffers.size(), iFree, fgActiveBuffers.size(), iActive);
   return iResult;
 }
 
-AliHLTConsumerDescriptor* AliHLTDataBuffer::FindConsumer(const AliHLTComponent* pConsumer, vector<AliHLTConsumerDescriptor*> &list) const
+AliHLTConsumerDescriptor* AliHLTDataBuffer::FindConsumer(const AliHLTComponent* pConsumer, AliHLTConsumerDescriptorPList &list) const
 {
   // see header file for function documentation
   AliHLTConsumerDescriptor* pDesc=NULL;
-  vector<AliHLTConsumerDescriptor*>::iterator desc=list.begin();
+  AliHLTConsumerDescriptorPList::iterator desc=list.begin();
   while (desc!=list.end() && pDesc==NULL) {
     if ((pConsumer==NULL || (*desc)->GetComponent()==pConsumer)) {
       pDesc=*desc;
@@ -554,8 +582,22 @@ int AliHLTDataBuffer::ResetDataBuffer()
   AliHLTRawBuffer* pBuffer=fpBuffer;
   fpBuffer=NULL;
 
+  // cleanup forwarded segment lists
+  assert(fForwardedSegments.size()==0);
+  fForwardedSegments.clear();
+  fForwardedSegmentSources.clear();
+
   // cleanup consumer states
-  vector<AliHLTConsumerDescriptor*>::iterator desc=fReleasedConsumers.begin();
+  AliHLTConsumerDescriptorPList::iterator desc;
+//   if (GetNofPendingConsumers()>0) {
+//     desc=fConsumers.begin();
+//     while (desc!=fConsumers.end()) {
+//       AliHLTComponent* pComp=(*desc)->GetComponent();
+//       HLTError("internal error: consumer %p (%s %p) did not get data from data buffer %p", *desc, pComp?pComp->GetComponentID():"", pComp, this);
+//       desc++;
+//     }
+//   }
+  desc=fReleasedConsumers.begin();
   while (desc!=fReleasedConsumers.end()) {
     AliHLTConsumerDescriptor* pDesc=*desc;
     fReleasedConsumers.erase(desc);
@@ -565,14 +607,14 @@ int AliHLTDataBuffer::ResetDataBuffer()
   desc=fActiveConsumers.begin();
   while (desc!=fActiveConsumers.end()) {
     AliHLTConsumerDescriptor* pDesc=*desc;
-    HLTWarning("consumer %p was not released", pDesc);
+    HLTWarning("consumer %p (%s) was not released", pDesc, pDesc->GetComponent()?pDesc->GetComponent()->GetComponentID():"### invalid component ###");
     fActiveConsumers.erase(desc);
     desc=fActiveConsumers.begin();
     fConsumers.push_back(pDesc);
   }
 
   // cleanup segments
-  vector<AliHLTDataSegment>::iterator segment=fSegments.begin();
+  AliHLTDataSegmentList::iterator segment=fSegments.begin();
   while (segment!=fSegments.end()) {
     fSegments.erase(segment);
     segment=fSegments.begin();
@@ -592,11 +634,11 @@ int AliHLTDataBuffer::Reset()
 }
 
 // this is the version which works on lists of components instead of consumer descriptors
-// int AliHLTDataBuffer::ChangeConsumerState(AliHLTComponent* pConsumer, vector<AliHLTComponent*> &srcList, vector<AliHLTComponent*> &tgtList)
+// int AliHLTDataBuffer::ChangeConsumerState(AliHLTComponent* pConsumer, AliHLTComponentPList &srcList, AliHLTComponentPList &tgtList)
 // {
 //   int iResult=0;
 //   if (pDesc) {
-//     vector<AliHLTComponent*>::iterator desc=srcList.begin();
+//     AliHLTComponentPList::iterator desc=srcList.begin();
 //     while (desc!=srcList.end()) {
 //       if ((*desc)==pConsumer) {
 //     srcList.erase(desc);
@@ -616,12 +658,12 @@ int AliHLTDataBuffer::Reset()
 //   return iResult;
 // }
 
-int AliHLTDataBuffer::ChangeConsumerState(AliHLTConsumerDescriptor* pDesc, vector<AliHLTConsumerDescriptor*> &srcList, vector<AliHLTConsumerDescriptor*> &tgtList)
+int AliHLTDataBuffer::ChangeConsumerState(AliHLTConsumerDescriptor* pDesc, AliHLTConsumerDescriptorPList &srcList, AliHLTConsumerDescriptorPList &tgtList)
 {
   // see header file for function documentation
   int iResult=-ENOENT;
   if (pDesc) {
-    vector<AliHLTConsumerDescriptor*>::iterator desc=srcList.begin();
+    AliHLTConsumerDescriptorPList::iterator desc=srcList.begin();
     while (desc!=srcList.end()) {
       if ((*desc)==pDesc) {
        srcList.erase(desc);
@@ -646,7 +688,7 @@ int AliHLTDataBuffer::CleanupConsumerList()
   // see header file for function documentation
   int iResult=0;
   ResetDataBuffer();
-  vector<AliHLTConsumerDescriptor*>::iterator desc=fConsumers.begin();
+  AliHLTConsumerDescriptorPList::iterator desc=fConsumers.begin();
   while (desc!=fConsumers.end()) {
     delete *desc;
     fConsumers.erase(desc);
@@ -655,10 +697,10 @@ int AliHLTDataBuffer::CleanupConsumerList()
   return iResult;
 }
 
-int AliHLTDataBuffer::FindConsumer(AliHLTComponent* pConsumer, int bAllLists)
+int AliHLTDataBuffer::FindConsumer(const AliHLTComponent* pConsumer, int bAllLists)
 {
   // see header file for function documentation
-  vector<AliHLTConsumerDescriptor*>::iterator desc=fConsumers.begin();
+  AliHLTConsumerDescriptorPList::iterator desc=fConsumers.begin();
   while (desc!=fConsumers.end()) {
     if ((*desc)->GetComponent()==pConsumer)
       return 1;
@@ -680,3 +722,117 @@ int AliHLTDataBuffer::FindConsumer(AliHLTComponent* pConsumer, int bAllLists)
   }
   return 0;
 }
+
+AliHLTDataBuffer::AliHLTRawBuffer::AliHLTRawBuffer(AliHLTUInt32_t size)
+  :
+  fSize(0),
+  fTotalSize(size),
+  fPtr(static_cast<AliHLTUInt8_t*>(malloc(size))),
+  fLastEventCount(0)
+{
+  // see header file for class documentation
+  // or
+  // refer to README to build package
+  // or
+  // visit http://web.ift.uib.no/~kjeks/doc/alice-hlt
+  if (fPtr==NULL) {
+    fSize=0;
+    fTotalSize=0;
+  }
+}
+
+AliHLTDataBuffer::AliHLTRawBuffer::~AliHLTRawBuffer()
+{
+  if (fPtr) {
+    free(fPtr);
+  }
+  fPtr=NULL;
+  fSize=0;
+  fTotalSize=0;
+}
+
+int AliHLTDataBuffer::AliHLTRawBuffer::operator==(void* ptr) const
+{
+  // see header file for function documentation
+  return fPtr == static_cast<AliHLTUInt8_t*>(ptr);
+}
+
+int AliHLTDataBuffer::AliHLTRawBuffer::operator<=(void* ptr) const
+{
+  // see header file for function documentation
+  int iResult=fPtr <= static_cast<AliHLTUInt8_t*>(ptr);
+  //printf("%p: %p <= %p (%d)\n", this, fPtr, ptr, iResult);
+  return iResult;
+}
+
+int AliHLTDataBuffer::AliHLTRawBuffer::operator>(void* ptr) const
+{
+  // see header file for function documentation
+  int iResult=fPtr+fSize > static_cast<AliHLTUInt8_t*>(ptr);
+  //printf("%p: %p + %d > %p (%d)\n", this, fPtr, fSize, ptr, iResult);
+  return iResult;
+}
+
+int AliHLTDataBuffer::AliHLTRawBuffer::operator-(void* ptr) const
+{
+  // see header file for function documentation
+  return static_cast<int>(static_cast<AliHLTUInt8_t*>(ptr)-fPtr);
+}
+
+AliHLTUInt8_t* AliHLTDataBuffer::AliHLTRawBuffer::UseBuffer(AliHLTUInt32_t size)
+{
+  // see header file for function documentation
+  if (size>0 && fTotalSize>=size) {
+    fSize=size;
+    fLastEventCount=AliHLTDataBuffer::fgEventCount;
+    return fPtr;
+  }
+  return NULL;
+}
+
+int AliHLTDataBuffer::AliHLTRawBuffer::CheckSize(AliHLTUInt32_t size) const
+{
+  // see header file for function documentation
+  if (fTotalSize<size) return 0;
+  unsigned adjust=0;
+  if (fLastEventCount+1<AliHLTDataBuffer::fgEventCount) {
+    adjust=AliHLTDataBuffer::fgEventCount-fLastEventCount;
+  }
+  return (adjust>2) || ((fTotalSize-size)<(fgMargin<<adjust));
+}
+
+int AliHLTDataBuffer::AliHLTRawBuffer::Reset()
+{
+  // see header file for function documentation
+  fSize=0;
+  return 0;
+}
+
+int AliHLTDataBuffer::AliHLTRawBuffer::WritePattern(const char* pattern, int size)
+{
+  // see header file for function documentation
+  int iResult=0;
+  if (pattern!=NULL && size>0) {
+    if (fSize+size<=fTotalSize) {
+      memcpy(((char*)fPtr)+fSize, pattern, size);
+      iResult=size;
+    } else {
+      iResult=-ENOSPC;
+    }
+  }
+  return iResult;
+}
+
+int AliHLTDataBuffer::AliHLTRawBuffer::CheckPattern(const char* pattern, int size) const
+{
+  // see header file for function documentation
+  int iResult=0;
+  if (pattern!=NULL && size>0) {
+    if (fSize+size<=fTotalSize) {
+      iResult=memcmp(((char*)fPtr)+fSize, pattern, size)!=0;
+    } else {
+      iResult=-ENOSPC;
+    }
+  }
+  return iResult;
+}