Re: [ROOT] unknown runtime error using gROOT->Reset()

From: Darren Grant (dgrant@casino.PHYS.CWRU.Edu)
Date: Mon Jun 07 2004 - 17:59:32 MEST


Hi Rene

Does this apply to all gROOT functions or only the Reset command?  Have I 
missed in the documentation somewhere as to the "why" this should not be 
done?

Thanks
Darren


On Mon, 7 Jun 2004, Rene Brun wrote:

> gROOT->Reset() should not be called in a named script or a compiled program.
> 
> Rene Brun
> 
> Darren Grant wrote:
> > 
> > Hi
> > 
> > I have come across an error I dont understand in running some root code.
> > I have tried to include the
> > 
> > gROOT->Reset();
> > 
> > command in my code.  I compile without errors but when I run the code I
> > get the following error:
> > 
> > *** Break *** segmentation violation
> >  Generating stack trace...
> >  0x4068b65e in G__scratch_globals_upto + 0x27 from
> > /home/dgrant/root/lib/libCint.so
> >  0x40176439 in TCint::ResetGlobals() + 0x21 from
> > /home/dgrant/root/lib/libCore.so
> >  0x4013a698 in TROOT::Reset(char const*) + 0x32 from
> > /home/dgrant/root/lib/libCore.so
> >  0x08049067 in main + 0x2f from matread
> >  0x42015574 in __libc_start_main + 0xe4 from /lib/tls/libc.so.6
> >  0x08048f9d in TFile::TFile[in-charge](char const*, char const*, char
> > const*, int) + 0x31 from matread
> > Abort (core dumped)
> > 
> > A simplified version of the code is:
> > 
> > #include <cstdio>
> > #include <iostream>
> > #include <string>
> > #include "TFile.h"
> > #include "TTree.h"
> > #include "TH2.h"
> > #include "TCanvas.h"
> > #include "TVector.h"
> > #include "TROOT.h"
> > #include "TCint.h"
> > 
> > using namespace std;
> > 
> > TROOT rootBase("analysis","ROOT analysis environment");
> > int main()
> > {
> > gROOT->Reset();
> > TFile *file = new TFile ("test.root", "RECREATE");
> > TTree *tree = new TTree ("tree", "Testing");
> > 
> > }
> > 
> > And this is compiled with a makefile:
> > 
> > # Makefile
> > #
> > ROOTLIBS        =       $(shell root-config --libs) -lMinuit #-lTable
> > -lHtml
> > ROOTGLIBS       =       $(shell root-config --glibs)
> > ROOTINCLUDE     ?=      $(shell root-config --incdir)
> > MATLABDIR       =       /data4/dgrant/Matlab_Inst/extern/lib/glnx86
> > MATLABD2        =       /data4/dgrant/Matlab_Inst/bin/glnx86
> > 
> > CXX             =       g++
> > CXXFLAGS        =       -O2 -Wall   -fPIC -I$(ROOTINCLUDE)
> > 
> > OBJS            =       matread.o
> > 
> > matread: $(OBJS)
> >         $(CXX) $(CXXFLAGS) $(ROOTLIBS) $(ROOTGLIBS) -L$(MATLABDIR) -lmat
> > -lmx -l
> > mmfile -lmwservices -L$(MATLABD2) -lmatlb -lmex -lmwmpath -lmwudd -o $@ $^
> > 
> > matread.d: matread.cxx
> >         @echo "Generating dependency file $@"
> >         @set -e; rm -f $@
> >         @$(CXX) -M $(CXXFLAGS) $< > $@.tmp
> >         @sed 's,\($*\)\.o[ :]*,\1.o $@ : ,g' < $@.tmp > $@
> >         @rm -f $@.tmp
> > 
> > include matread.d
> > 
> > matread.o:      matread.cxx matread.h
> >         $(CXX) -c $(CXXFLAGS) $<
> > 
> > clean:
> >         rm -f *.o
> >         rm -f *.d
> > 
> > Has anyone come across this before and maybe offer some advice?
> > 
> > Thanks so much!
> > Cheers
> > Darren
> 



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