From f44145612a91ab70421abeba2003355c3392bb0e Mon Sep 17 00:00:00 2001
From: morsch <morsch@f7af4fe6-9843-0410-8265-dc069ae4e863>
Date: Thu, 2 Aug 2007 18:03:47 +0000
Subject: [PATCH] Use bit 14 of TParticle to flag tracks that have been
 transported. This makes the synchronization between TreeTR and TreeK more
 robust.

---
 STEER/AliMC.cxx    |  7 +++++--
 STEER/AliStack.cxx | 10 +++++++++-
 STEER/AliStack.h   |  2 +-
 3 files changed, 15 insertions(+), 4 deletions(-)

diff --git a/STEER/AliMC.cxx b/STEER/AliMC.cxx
index a5b153e063a..c50793860a9 100644
--- a/STEER/AliMC.cxx
+++ b/STEER/AliMC.cxx
@@ -1251,7 +1251,8 @@ void AliMC::ReorderAndExpandTreeTR()
 	// Skip primaries that have not been transported
 	Int_t dau1  = part->GetFirstDaughter();
 	Int_t dau2  = -1;
-	if ((dau1 > -1 && dau1 < np) || part->GetStatusCode() > 1) continue;
+	// if ((dau1 > -1 && dau1 < np) || part->GetStatusCode() > 1) continue;
+	if (!part->TestBit(kTransportBit)) continue;
 	//
 	fTmpTreeTR->GetEntry(it++);
 	Int_t nh = fTmpTrackReferences->GetEntries();
@@ -1302,7 +1303,9 @@ void AliMC::ReorderAndExpandTreeTR()
     it = nt - 1;
     for (Int_t ip = 0; ip < np; ip++) {
 	TParticle* part = stack->Particle(ip);
-	if ((part->GetFirstDaughter() == -1 && part->GetStatusCode() <= 1) || part->GetFirstDaughter() >= np) {
+//	if ((part->GetFirstDaughter() == -1 && part->GetStatusCode() <= 1) || part->GetFirstDaughter() >= np) 
+	if (part->TestBit(kTransportBit));
+	{
 	    // Skip particles that have not been transported
 	    fTmpTreeTR->GetEntry(it--);
 	    Int_t nh = fTmpTrackReferences->GetEntries();
diff --git a/STEER/AliStack.cxx b/STEER/AliStack.cxx
index 185b6c7894e..d6e4f9a0b0a 100644
--- a/STEER/AliStack.cxx
+++ b/STEER/AliStack.cxx
@@ -216,7 +216,15 @@ void AliStack::PushTrack(Int_t done, Int_t parent, Int_t pdg,
   particle->SetWeight(weight);
   particle->SetUniqueID(mech);
 
-  if(!done) particle->SetBit(kDoneBit);
+  
+  
+  if(!done) {
+      particle->SetBit(kDoneBit);
+  } else {
+      particle->SetBit(kTransportBit);
+  }
+  
+  
 
   //  Declare that the daughter information is valid
   particle->SetBit(kDaughtersBit);
diff --git a/STEER/AliStack.h b/STEER/AliStack.h
index 2b204fb7d69..21898205782 100644
--- a/STEER/AliStack.h
+++ b/STEER/AliStack.h
@@ -21,7 +21,7 @@ class TTree;
 class AliHeader;
 #include "AliConfig.h"
 
-enum {kKeepBit=1, kDaughtersBit=2, kDoneBit=4};
+enum {kKeepBit=1, kDaughtersBit=2, kDoneBit=4, kTransportBit=BIT(14)};
 
 class AliStack : public TVirtualMCStack
 {
-- 
2.43.0