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

   1 /* This testcase is part of GDB, the GNU debugger.
   2
   3    Copyright 2009-2017 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 <stdio.h>
  22 #include <string.h>
  23 #include <assert.h>
  24
  25 static const char *image;
  26 static volatile pthread_t main_thread;
  27 static pthread_barrier_t barrier;
  28 static char *argv1 = "go away";
  29
  30 static void *
  31 thread_execler (void *arg)
  32 {
  33   int i;
  34
  35   pthread_barrier_wait (&barrier);
  36
  37   i = pthread_join (main_thread, NULL);
  38   assert (i == 0);
  39
  40   /* Exec ourselves again.  */
  41   if (execl (image, image, argv1, NULL) == -1) /* break-here */
  42     {
  43       perror ("execl");
  44       abort ();
  45     }
  46
  47   return NULL;
  48 }
  49
  50 static void *
  51 just_loop (void *arg)
  52 {
  53   unsigned int i;
  54
  55   pthread_barrier_wait (&barrier);
  56
  57   for (i = 1; i > 0; i++)
  58     usleep (1);
  59
  60   return NULL;
  61 }
  62
  63 #define THREADS 5
  64
  65 pthread_t loop_thread[THREADS];
  66
  67 int
  68 main (int argc, char **argv)
  69 {
  70   pthread_t thread;
  71   int i, t;
  72
  73   image = argv[0];
  74
  75   /* Pass "inf" as argument to keep re-execing ad infinitum, which can
  76      be useful for manual testing.  Passing any other argument exits
  77      immediately (and that's what the execl above does by
  78      default).  */
  79   if (argc == 2 && strcmp (argv[1], "inf") == 0)
  80     argv1 = argv[1];
  81   else if (argc > 1)
  82     exit (0);
  83
  84   main_thread = pthread_self ();
  85
  86   pthread_barrier_init (&barrier, NULL, 2 + THREADS);
  87
  88   i = pthread_create (&thread, NULL, thread_execler, NULL);
  89   assert (i == 0);
  90
  91   for (t = 0; t < THREADS; t++)
  92     {
  93       i = pthread_create (&loop_thread[t], NULL, just_loop, NULL);
  94       assert (i == 0);
  95     }
  96
  97   pthread_barrier_wait (&barrier);
  98
  99   pthread_exit (NULL);
 100   /* NOTREACHED */
 101   return 0;
 102 }