sysdeps/pthread/tst-tls4modb.c

   1 /* Copyright (C) 2003-2023 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <stddef.h>
  19 #include <stdlib.h>
  20
  21 static int i;
  22 int bar;
  23
  24 static __thread void *foo [32 / sizeof (void *)]
  25   __attribute__ ((tls_model ("initial-exec"), aligned (sizeof (void *))))
  26   = { &i, &bar };
  27
  28 void
  29 test1 (void)
  30 {
  31   size_t s;
  32
  33   if (foo [0] != &i || foo [1] != &bar)
  34     abort ();
  35
  36   foo [0] = NULL;
  37   foo [1] = NULL;
  38   for (s = 0; s < sizeof (foo) / sizeof (void *); ++s)
  39     {
  40       if (foo [s])
  41         abort ();
  42       foo [s] = &foo[s];
  43     }
  44 }
  45
  46 void
  47 test2 (void)
  48 {
  49   size_t s;
  50
  51   for (s = 0; s < sizeof (foo) / sizeof (void *); ++s)
  52     {
  53       if (foo [s] != &foo [s])
  54         abort ();
  55       foo [s] = &foo [s ^ 1];
  56     }
  57 }