g4libs.C File Reference

Macro for loading Geant4 and Geant4 VMC libraries. More...

#include <iostream>
#include <TSystem.h>
#include <TString.h>
#include <TApplication.h>
#include <TROOT.h>
#include <string>

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Namespaces
namespace	g4libUtilities

Functions
Bool_t	g4libUtilities::isLibrary (const char *libName)
void	loadg4libs ()
Bool_t	isBatch ()
Bool_t	isSet (const char *variable)
Bool_t	isMT ()
void	vgmlibs ()
void	g4libs ()

Detailed Description

Macro for loading Geant4 and Geant4 VMC libraries.

New macro for loading Geant4 and Geant4 VMC libraries with using geant4-config script provided in Geant4. Besides loading libraries, the macro also resets FPE mask to 0, in order to make sure than FPE for FE_OVERFLOW is disabled what is required for Geant4.

Definition in file g4libs.C.

Function Documentation

loadg4libs()

void loadg4libs

(

)

Macro function for loading Geant4 libraries from list of libraries build by geant4-config –libs

Definition at line 44 of file g4libs.C.

{
/// Macro function for loading Geant4 libraries
/// from list of libraries build by geant4-config --libs
 
  FILE* pipe = gSystem->OpenPipe("geant4-config --libs", "r");
  std::string all_lines;
  char line[1000];
  while ( fgets(line, sizeof(line), pipe ) != NULL ) {
    all_lines += line;
  }
 
  TString all_lines_t(all_lines.data());
  all_lines_t.Remove(all_lines_t.First('\n'));
  //cout << all_lines_t.Data() << endl;
  TObjArray* libs = all_lines_t.Tokenize(" ");
 
  //TString dynamicPath = gSystem->GetDynamicPath();
  for (Int_t i=libs->GetEntriesFast()-1; i>=0; i-- ) {
    TString addPath = ((TObjString*)libs->At(i))->GetString();
    if (addPath.BeginsWith("-L")) {
      addPath.Remove(0,2);
      addPath.ReplaceAll("\"", "");
      //cout << "Adding dynamic path " << addPath.Data() << endl;
      gSystem->AddDynamicPath(addPath.Data());
    }
  }
 
  cout << libs->GetEntriesFast() << endl;
  for (Int_t i=libs->GetEntriesFast()-1; i>=0; i-- ) {
    TString lib = ((TObjString*)libs->At(i))->GetString();
    lib.ReplaceAll("-l", "lib");
    //cout << "Loading |" << lib.Data() << "|" << endl;
    if(lib.BeginsWith("lib"))
      gSystem->Load(lib.Data());
  }
 
  gSystem->SetFPEMask(0);
}

isBatch()

Bool_t isBatch

(

)

Helper function which testes if Root was started in batch mode

Definition at line 84 of file g4libs.C.

{
/// Helper function which testes if Root was started in batch mode
 
  for ( Int_t i=0; i<gApplication->Argc(); ++i )
    if ( TString(gROOT->GetApplication()->Argv(i)) == "-b" ) return true;
 
  return false;
}

isSet()

Bool_t isSet

(

const char *

variable

)

Helper function which checks if the specified environment variable is set.

Parameters

variable

The environment variable name

Definition at line 94 of file g4libs.C.

{
/// Helper function which checks if the specified environment variable
/// is set.
/// \param variable  The environment variable name
 
  TString value = gSystem->Getenv(variable);
  if ( value != "") return true;
 
  return false;
}

isMT()

Bool_t isMT

(

)

Macro function for detecting if Geant4 libraries are built in multi-threading mode via geant4-config –has-feature multithreading

Definition at line 106 of file g4libs.C.

{
/// Macro function for detecting if Geant4 libraries
/// are built in multi-threading mode via
/// geant4-config --has-feature multithreading
 
  FILE* pipe = gSystem->OpenPipe("geant4-config  --has-feature multithreading", "r");
  char line[10];
  fgets(line, sizeof(line), pipe);
  TString answer = line;
  answer.Remove(answer.First('\n'));
 
  return ( answer == "yes");
}

vgmlibs()

void vgmlibs

(

)

Function for loading VGM libraries.

Definition at line 121 of file g4libs.C.

{
/// Function for loading VGM libraries.
 
  if ( isSet("USE_VGM") ) {
    cout << "Loading VGM libraries ... " << endl;
    gSystem->Load("libClhepVGM");
    gSystem->Load("libBaseVGM");
    gSystem->Load("libGeant4GM");
    gSystem->Load("libRootGM");
    gSystem->Load("libXmlVGM");
  }
}

g4libs()

void g4libs

(

)

Definition at line 135 of file g4libs.C.

{
  // Load Geant4 libraries
  cout << "Loading Geant4 libraries (using geant4-config) ..." << endl;
  loadg4libs();
 
  // VGM librares
  vgmlibs();
 
  // VMC library (optional)
  if ( g4libUtilities::isLibrary("libVMCLibrary") ) {
    cout << "Loading VMC library ..." << endl;
    gSystem->Load("libVMCLibrary");
  }
 
  // G4Root library (if available)
  cout << "Loading g4root library ..." << endl;
  gSystem->Load("libg4root");
 
  // Geant4 VMC library
  cout << "Loading geant4vmc library ..." << endl;
  gSystem->Load("libgeant4vmc");
 
  // initialize Root threading
  if ( isMT() ) {
    TThread::Initialize();
  }
}