gdb/testsuite/gdb.threads/non-ldr-exc-3.c

   1 /* This testcase is part of GDB, the GNU debugger.
   2
   3    Copyright 2009-2014 Free Software Foundation, Inc.
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 3 of the License, or
   8    (at your option) any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  17
  18 #include <pthread.h>
  19 #include <unistd.h>
  20 #include <stdlib.h>
  21 #include <assert.h>
  22
  23 static const char *image;
  24 static volatile pthread_t main_thread;
  25 static pthread_barrier_t barrier;
  26 static char *argv1 = "go away";
  27
  28 static void *
  29 thread_execler (void *arg)
  30 {
  31   int i;
  32
  33   pthread_barrier_wait (&barrier);
  34
  35   i = pthread_join (main_thread, NULL);
  36   assert (i == 0);
  37
  38   /* Exec ourselves again.  */
  39   if (execl (image, image, argv1, NULL) == -1) /* break-here */
  40     {
  41       perror ("execl");
  42       abort ();
  43     }
  44
  45   return NULL;
  46 }
  47
  48 static void *
  49 just_loop (void *arg)
  50 {
  51   unsigned int i;
  52
  53   pthread_barrier_wait (&barrier);
  54
  55   for (i = 1; i > 0; i++)
  56     usleep (1);
  57
  58   return NULL;
  59 }
  60
  61 #define THREADS 5
  62
  63 pthread_t loop_thread[THREADS];
  64
  65 int
  66 main (int argc, char **argv)
  67 {
  68   pthread_t thread;
  69   int i, t;
  70
  71   image = argv[0];
  72
  73   /* Pass "inf" as argument to keep re-execing ad infinitum, which can
  74      be useful for manual testing.  Passing any other argument exits
  75      immediately (and that's what the execl above does by
  76      default).  */
  77   if (argc == 2 && strcmp (argv[1], "inf") == 0)
  78     argv1 = argv[1];
  79   else if (argc > 1)
  80     exit (0);
  81
  82   main_thread = pthread_self ();
  83
  84   pthread_barrier_init (&barrier, NULL, 2 + THREADS);
  85
  86   i = pthread_create (&thread, NULL, thread_execler, NULL);
  87   assert (i == 0);
  88
  89   for (t = 0; t < THREADS; t++)
  90     {
  91       i = pthread_create (&loop_thread[t], NULL, just_loop, NULL);
  92       assert (i == 0);
  93     }
  94
  95   pthread_barrier_wait (&barrier);
  96
  97   pthread_exit (NULL);
  98   /* NOTREACHED */
  99   return 0;
 100 }