Attachment 2082 Details for Bug 5300 – Source code that causes "where" to get an NPE.

Source code that causes "where" to get an NPE.

testpeek.c (text/plain), 3.40 KB, created by Rick Moseley on 2007-11-09 14:02:21 UTC

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Filename:

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Creator: Rick Moseley

Created: 2007-11-09 14:02:21 UTC

Size: 3.40 KB

patch

obsolete

>// This file is part of the program FRYSK.
>//
>// Copyright 2007, Red Hat Inc.
>//
>// FRYSK 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; version 2 of the License.
>//
>// FRYSK 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 FRYSK; if not, write to the Free Software Foundation,
>// Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
>// 
>// In addition, as a special exception, Red Hat, Inc. gives You the
>// additional right to link the code of FRYSK with code not covered
>// under the GNU General Public License ("Non-GPL Code") and to
>// distribute linked combinations including the two, subject to the
>// limitations in this paragraph. Non-GPL Code permitted under this
>// exception must only link to the code of FRYSK through those well
>// defined interfaces identified in the file named EXCEPTION found in
>// the source code files (the "Approved Interfaces"). The files of
>// Non-GPL Code may instantiate templates or use macros or inline
>// functions from the Approved Interfaces without causing the
>// resulting work to be covered by the GNU General Public
>// License. Only Red Hat, Inc. may make changes or additions to the
>// list of Approved Interfaces. You must obey the GNU General Public
>// License in all respects for all of the FRYSK code and other code
>// used in conjunction with FRYSK except the Non-GPL Code covered by
>// this exception. If you modify this file, you may extend this
>// exception to your version of the file, but you are not obligated to
>// do so. If you do not wish to provide this exception without
>// modification, you must delete this exception statement from your
>// version and license this file solely under the GPL without
>// exception.
>
>#include <pthread.h>
>#include <stdio.h>
>#include <stdlib.h>
>#include <sys/types.h>
>#include <linux/unistd.h>
>#include <errno.h>
>
>_syscall0(pid_t,gettid)
>
>pthread_t tester_thread;
>
>pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
>pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
>
>static char * myname;
>
>void
>*do_it ()
>{
>  int t = 34543;
>  while (t > 0)
>    t--;
>
>  fprintf (stderr,"attach %s pid=%d -task tid=%d -cli\n", myname, getpid(), gettid());
>
>  int d = 0;
>  int e = 0;
>
>  while (1)
>    {
>      d++;
>      e++;
>      if (d == 3)
>        {
>          if (e == 3)
>            e = 0;
>          d = 0;
>        }
>    }
>    
>  return NULL;
>}
>
>void
>bak ()
>{
>  while (1)
>    {
>      fprintf (stderr,"attach %s pid=%d -task tid=%d -cli\n", myname, getpid(), gettid());
>      int a = 0;
>      int b = 0;
>      int c = 0;
>      while (1)
>        {
>          a++;
>          b++;
>          c++;
>          if (a + b > 4)
>            {
>              a = a - c;
>              b = b - c;
>              c = 0;
>            }
>        }
>    }
>}
>
>void 
>baz ()
>{
>  int a;
>  int b = 0;
>  bak ();
>}
>
>void 
>bar ()
>{
>  close (-1);
>  close (-1);
>  baz ();
>  /*Comment */
>}
>
>void
>foo ()
>{
>  bar ();
>}
>
>
>int 
>main (int argc, char **argv)
>{
>  myname = argv[0];
>  pthread_attr_t attr;
>  pthread_attr_init (&attr);
>  pthread_create (&tester_thread, &attr, do_it, NULL);
>
>  /* This is a comment */
>  foo ();
>  int t = 30;
>
>  exit (0);
>}
>

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