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

   1 /* This testcase is part of GDB, the GNU debugger.
   2
   3    Copyright 2009-2022 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 pthread_barrier_t barrier;
  27 static char *argv1 = "go away";
  28
  29 static void *
  30 thread_execler (void *arg)
  31 {
  32   int i;
  33
  34   pthread_barrier_wait (&barrier);
  35
  36   /* Exec ourselves again.  */
  37   if (execl (image, image, argv1, NULL) == -1) /* break-here */
  38     {
  39       perror ("execl");
  40       abort ();
  41     }
  42
  43   return NULL;
  44 }
  45
  46 static void *
  47 just_loop (void *arg)
  48 {
  49   unsigned int i;
  50
  51   pthread_barrier_wait (&barrier);
  52
  53   for (i = 1; i > 0; i++)
  54     usleep (1);
  55
  56   return NULL;
  57 }
  58
  59 #define THREADS 5
  60
  61 pthread_t loop_thread[THREADS];
  62
  63 int
  64 main (int argc, char **argv)
  65 {
  66   pthread_t thread;
  67   int i, t;
  68
  69   image = argv[0];
  70
  71   /* Pass "inf" as argument to keep re-execing ad infinitum, which can
  72      be useful for manual testing.  Passing any other argument exits
  73      immediately (and that's what the execl above does by
  74      default).  */
  75   if (argc == 2 && strcmp (argv[1], "inf") == 0)
  76     argv1 = argv[1];
  77   else if (argc > 1)
  78     exit (0);
  79
  80   pthread_barrier_init (&barrier, NULL, 2 + THREADS);
  81
  82   i = pthread_create (&thread, NULL, thread_execler, NULL);
  83   assert (i == 0);
  84
  85   for (t = 0; t < THREADS; t++)
  86     {
  87       i = pthread_create (&loop_thread[t], NULL, just_loop, NULL);
  88       assert (i == 0);
  89     }
  90
  91   pthread_barrier_wait (&barrier);
  92   pthread_join (thread, NULL);
  93   return 0;
  94 }