1 // @(#) $Id: AliHLTTPCCANeighboursCleaner.cxx 27042 2008-07-02 12:06:02Z richterm $
2 // **************************************************************************
3 // This file is property of and copyright by the ALICE HLT Project *
4 // ALICE Experiment at CERN, All rights reserved. *
6 // Primary Authors: Sergey Gorbunov <sergey.gorbunov@kip.uni-heidelberg.de> *
7 // Ivan Kisel <kisel@kip.uni-heidelberg.de> *
8 // for The ALICE HLT Project. *
10 // Permission to use, copy, modify and distribute this software and its *
11 // documentation strictly for non-commercial purposes is hereby granted *
12 // without fee, provided that the above copyright notice appears in all *
13 // copies and that both the copyright notice and this permission notice *
14 // appear in the supporting documentation. The authors make no claims *
15 // about the suitability of this software for any purpose. It is *
16 // provided "as is" without express or implied warranty. *
18 //***************************************************************************
21 #include "AliHLTTPCCANeighboursCleaner.h"
22 #include "AliHLTTPCCAMath.h"
23 #include "AliHLTTPCCATracker.h"
25 GPUd() void AliHLTTPCCANeighboursCleaner::Thread
26 ( int /*nBlocks*/, int nThreads, int iBlock, int iThread, int iSync,
27 AliHLTTPCCASharedMemory &s, AliHLTTPCCATracker &tracker )
30 // * kill link to the neighbour if the neighbour is not pointed to the cluster
35 s.fNRows = tracker.Param().NRows();
37 if ( s.fIRow <= s.fNRows - 3 ) {
38 s.fIRowUp = s.fIRow + 2;
39 s.fIRowDn = s.fIRow - 2;
40 s.fNHits = tracker.Row( s.fIRow ).NHits();
43 } else if ( iSync == 1 ) {
44 if ( s.fIRow <= s.fNRows - 3 ) {
45 const AliHLTTPCCARow &row = tracker.Row( s.fIRow );
46 const AliHLTTPCCARow &rowUp = tracker.Row( s.fIRowUp );
47 const AliHLTTPCCARow &rowDn = tracker.Row( s.fIRowDn );
49 // - look at up link, if it's valid but the down link in the row above doesn't link to us remove
51 // - look at down link, if it's valid but the up link in the row below doesn't link to us remove
53 for ( int ih = iThread; ih < s.fNHits; ih += nThreads ) {
54 int up = tracker.HitLinkUpData( row, ih );
56 short upDn = tracker.HitLinkDownData( rowUp, up );
57 if ( ( upDn != ih ) ) tracker.SetHitLinkUpData( row, ih, -1 );
59 int dn = tracker.HitLinkDownData( row, ih );
61 short dnUp = tracker.HitLinkUpData( rowDn, dn );
62 if ( dnUp != ih ) tracker.SetHitLinkDownData( row, ih, -1 );