text: /* This testcase is part of GDB, the GNU debugger.
  
     Copyright 2009-2015 Free Software Foundation, Inc.
  
     This program is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
  
     This program is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     GNU General Public License for more details.
  
     You should have received a copy of the GNU General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  
  #include <pthread.h>
  #include <unistd.h>
  #include <stdlib.h>
  #include <assert.h>
  
  static const char *image;
  static pthread_barrier_t barrier;
  static char *argv1 = "go away";
  
  static void *
  thread_execler (void *arg)
  {
    int i;
  
    pthread_barrier_wait (&barrier);
  
    /* Exec ourselves again.  */
    if (execl (image, image, argv1, NULL) == -1) /* break-here */
      {
        perror ("execl");
        abort ();
      }
  
    return NULL;
  }
  
  static void *
  just_loop (void *arg)
  {
    unsigned int i;
  
    pthread_barrier_wait (&barrier);
  
    for (i = 1; i > 0; i++)
      usleep (1);
  
    return NULL;
  }
  
  #define THREADS 5
  
  pthread_t loop_thread[THREADS];
  
  int
  main (int argc, char **argv)
  {
    pthread_t thread;
    int i, t;
  
    image = argv[0];
  
    /* Pass "inf" as argument to keep re-execing ad infinitum, which can
       be useful for manual testing.  Passing any other argument exits
       immediately (and that's what the execl above does by
       default).  */
    if (argc == 2 && strcmp (argv[1], "inf") == 0)
      argv1 = argv[1];
    else if (argc > 1)
      exit (0);
  
    pthread_barrier_init (&barrier, NULL, 2 + THREADS);
  
    i = pthread_create (&thread, NULL, thread_execler, NULL);
    assert (i == 0);
  
    for (t = 0; t < THREADS; t++)
      {
        i = pthread_create (&loop_thread[t], NULL, just_loop, NULL);
        assert (i == 0);
      }
  
    pthread_barrier_wait (&barrier);
    pthread_join (thread, NULL);
    return 0;
  }
  