Hi there!

Is it possible to generate a PerlInterpreter instance, delete it and then build a new PerlInterpreter instance if you didn't compile your perl with -DMULTIPLICITY?

We've written a segfaulting sample prog:

extern "C" {
#include <EXTERN.h>
#include <perl.h>
#include <XSUB.h>
}
#include <iostream>

PerlInterpreter *perlInt;

void start() {
  perlInt = perl_alloc();
  perl_construct(perlInt);

  char *embedding[] = 
    { "", "-w", "-e", "use diagnostics;" }; 
  perl_parse(perlInt, NULL, 4, embedding, NULL);   
  perl_run(perlInt);
  
  PL_perl_destruct_level = 1;
  cout << "destructing..." << flush;
  perl_destruct(perlInt);
  cout << "done" << endl;

  perl_free(perlInt);
}

int main() {
  start(); 
  start(); 

  return 0;
}
[download]

The output is:

cordelia:~/stuff/xpertmud/xpertmud 201> ./perl_problem
destructing...done
destructing...Segmentation fault

backtrace:

Starting program: 
/home/tmp/klimek/shadow/xpertmud/xpertmud/xpertmud/./perl_problem
destructing...done
destructing...
Program received signal SIGSEGV, Segmentation fault.
0x4015ae8e in free () from /lib/libc.so.6
(gdb) back
#0  0x4015ae8e in free () from /lib/libc.so.6
#1  0x4015ae19 in free () from /lib/libc.so.6
#2  0x0805a523 in perl_destruct () at eval.c:41
#3  0x08059922 in start () at perl_problem.cc:21
#4  0x08059964 in main () at perl_problem.cc:29
#5  0x400f7237 in __libc_start_main () from /lib/libc.so.6

The question: Is this some general problem or did we do something wrong?

Thanks for any help,
        Manuel