Hi,
I’m trying to make a macro based on the code from tutorials/gui/exec3.C.
The original macro works well, but when I modify it (see below), it crashes if I execute it 3 times in a row.
The simplest way to reproduce the problem is the following:
-
add two lines at the end of exec3() function:
delete h;
delete c1; -
add three (empty) functions at the end of the file, e.g.:
void sss1(){}
void sss2(){}
void sss3(){}
Here is the text of the macro:
#include <TH1.h>
#include <TCanvas.h>
#include <TQObject.h>
void exec3()
{
// Example of using signal/slot in TCanvas/TPad to get feedback
// about processed events. Note that slots can be either functions
// or class methods. Compare this with tutorials exec1.C and exec2.C.
//Author: Ilka Antcheva
TH1F *h = new TH1F("h","h",100,-3,3);
h->FillRandom("gaus",1000);
TCanvas *c1=new TCanvas("c1");
h->Draw();
c1->Update();
c1->Connect("ProcessedEvent(Int_t,Int_t,Int_t,TObject*)", 0, 0,
"exec3event(Int_t,Int_t,Int_t,TObject*)");
delete h;
delete c1;
}
void exec3event(Int_t event, Int_t x, Int_t y, TObject *selected)
{
TCanvas *c = (TCanvas *) gTQSender;
printf("Canvas %s: event=%d, x=%d, y=%d, selected=%s\n", c->GetName(),
event, x, y, selected->IsA()->GetName());
}
void sss1(){}
void sss2(){}
void sss3(){}
This is the root output:
ROOT 5.30/04 (tags/v5-30-04@41807, Nov 08 2011, 14:28:58 on linuxx8664gcc)
CINT/ROOT C/C++ Interpreter version 5.18.00, July 2, 2010
Type ? for help. Commands must be C++ statements.
Enclose multiple statements between { }.
root [0] .x exec3.C
root [1] .x exec3.C
root [2] .x exec3.C
*** Break *** segmentation violation
Root > Function exec3() busy flag cleared
There is no error if I execute it by
.L exec3.C
exec3() (many times)
Can anyone reproduce this error? Is it a bug or am I doing something wrong?
I’m running ubuntu 11.10 x86_64, if it’s important…
Thanks,
Yuri.