gdb/testsuite/gdb.threads/non-ldr-exc-4.c

   1 /* This testcase is part of GDB, the GNU debugger.
   2
   3    Copyright 2009-2013 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 pthread_barrier_t barrier;
  25 static char *argv1 = "go away";
  26
  27 static void *
  28 thread_execler (void *arg)
  29 {
  30   int i;
  31
  32   pthread_barrier_wait (&barrier);
  33
  34   /* Exec ourselves again.  */
  35   if (execl (image, image, argv1, NULL) == -1) /* break-here */
  36     {
  37       perror ("execl");
  38       abort ();
  39     }
  40
  41   return NULL;
  42 }
  43
  44 static void *
  45 just_loop (void *arg)
  46 {
  47   unsigned int i;
  48
  49   pthread_barrier_wait (&barrier);
  50
  51   for (i = 1; i > 0; i++)
  52     usleep (1);
  53
  54   return NULL;
  55 }
  56
  57 #define THREADS 5
  58
  59 pthread_t loop_thread[THREADS];
  60
  61 int
  62 main (int argc, char **argv)
  63 {
  64   pthread_t thread;
  65   int i, t;
  66
  67   image = argv[0];
  68
  69   /* Pass "inf" as argument to keep re-execing ad infinitum, which can
  70      be useful for manual testing.  Passing any other argument exits
  71      immediately (and that's what the execl above does by
  72      default).  */
  73   if (argc == 2 && strcmp (argv[1], "inf") == 0)
  74     argv1 = argv[1];
  75   else if (argc > 1)
  76     exit (0);
  77
  78   pthread_barrier_init (&barrier, NULL, 2 + THREADS);
  79
  80   i = pthread_create (&thread, NULL, thread_execler, NULL);
  81   assert (i == 0);
  82
  83   for (t = 0; t < THREADS; t++)
  84     {
  85       i = pthread_create (&loop_thread[t], NULL, just_loop, NULL);
  86       assert (i == 0);
  87     }
  88
  89   pthread_barrier_wait (&barrier);
  90   pthread_join (thread, NULL);
  91   return 0;
  92 }