Re: [ROOT] Using TMapFile in my C++ Program

From: m. schulte-wissermann (schulte@pktw08.phy.tu-dresden.de)
Date: Thu May 02 2002 - 16:30:18 MEST


hi rene, fonds and all,
 i too have a problem using TMapFile in a compiled program,
    - i do have :  ROOTLIBS     := $(shell root-config --new --libs)
    - i do use rootn.exe as the consumer
    - i did various combinations of : TMapFile::SetMapAddress(0x41027000);
        as in the producer program as in the client (CINT)
     
      the producer program runs in it's endless loop, but
      by doing :
	root [0]  map = TMapFile::Create("hsimple.map");
      i get an endless stream of :
     	Root > 
     	*** Break *** segmentation violation
     	Root > 
     	*** Break *** segmentation violation
     	Root >

      which can not be stoped (C-c,C-z,C-q, only kill -9 ...)

	what am i doing wrong. 

      martin

 PS: root 3.02.07, suse-linux 7.3, 2x750 PentiumIII 

On Thu, 2 May 2002, Rene Brun wrote:

> Hi Christian,
> 
> When you link your own program using a TMapFile, you must link
> with libNew.so
> 
> Rene Brun
> 
> Christian Vogel wrote:
> > 
> > Hi,
> > 
> > currently I'm trying to explore root and I'm stuck at a very
> > early stage... I'm trying to integrate the shared-memory-examples
> > from http://root.cern.ch/Tutorials.html into my C++ code.
> > 
> > The C++ Code I try to use looks like that:
> > 
> >   TMapFile *mf = TMapFile::Create("/dev/shm/test.map",
> >                                   "RECREATE",100000,"Test mapfile");
> >   TH1F *hpx = new TH1F("histo","This is a histo",4096,0,4095);
> > 
> > When I use a rootn-session with this code, another rootn-session
> > can do "mf=TMapFile::Create("/dev/shm/test.map") just fine.
> > 
> > When I compile a C++ Program with exactly the same code the
> > other rootn-session *** BREAK ***'s and segfaults.
> > 
> > Any hints where I should look or what I have done wrong?
> > 
> >         Chris
> > 
> > --
> > Is it true that cannibals won't eat clowns because they taste funny?
> 



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