sysdeps/pthread/tst-pt-tls1.c

   1 /* Copyright (C) 2003-2024 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 <pthread.h>
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21 #include <stdint.h>
  22 #include <inttypes.h>
  23 #include <support/support.h>
  24 #include <support/check.h>
  25 #include <support/xthread.h>
  26
  27 struct test_s
  28 {
  29   __attribute__ ((aligned(0x20))) int a;
  30   __attribute__ ((aligned(0x200))) int b;
  31 };
  32
  33 #define INIT_A 1
  34 #define INIT_B 42
  35 /* Deliberately not static.  */
  36 __thread struct test_s s __attribute__ ((tls_model ("initial-exec"))) =
  37 {
  38   .a = INIT_A,
  39   .b = INIT_B
  40 };
  41
  42 /* Use noinline in combination with not static to ensure that the
  43    alignment check is really done.  Otherwise it was optimized out!  */
  44 __attribute__ ((noinline)) void
  45 check_alignment (const char *thr_name, const char *ptr_name,
  46                  int *ptr, int alignment)
  47 {
  48   uintptr_t offset_aligment = ((uintptr_t) ptr) & (alignment - 1);
  49   if (offset_aligment)
  50     {
  51       FAIL_EXIT1 ("%s (%p) is not 0x%x-byte aligned in %s thread\n",
  52                   ptr_name, ptr, alignment, thr_name);
  53     }
  54 }
  55
  56 static void
  57 check_s (const char *thr_name)
  58 {
  59   if (s.a != INIT_A || s.b != INIT_B)
  60     FAIL_EXIT1 ("initial value of s in %s thread wrong\n", thr_name);
  61
  62   check_alignment (thr_name, "s.a", &s.a, 0x20);
  63   check_alignment (thr_name, "s.b", &s.b, 0x200);
  64 }
  65
  66 static void *
  67 tf (void *arg)
  68 {
  69   check_s ("child");
  70
  71   ++s.a;
  72
  73   return NULL;
  74 }
  75
  76
  77 int
  78 do_test (void)
  79 {
  80   check_s ("main");
  81
  82   pthread_attr_t a;
  83
  84   xpthread_attr_init (&a);
  85
  86 #define STACK_SIZE (1 * 1024 * 1024)
  87   xpthread_attr_setstacksize (&a, STACK_SIZE);
  88
  89 #define N 10
  90   int i;
  91   for (i = 0; i < N; ++i)
  92     {
  93 #define M 10
  94       pthread_t th[M];
  95       int j;
  96       for (j = 0; j < M; ++j, ++s.a)
  97         th[j] = xpthread_create (&a, tf, NULL);
  98
  99       for (j = 0; j < M; ++j)
 100         xpthread_join (th[j]);
 101     }
 102
 103   /* Also check the alignment of the tls variables if a misaligned stack is
 104      specified.  */
 105   pthread_t th;
 106   void *thr_stack = NULL;
 107   thr_stack = xposix_memalign (0x200, STACK_SIZE + 1);
 108   xpthread_attr_setstack (&a, thr_stack + 1, STACK_SIZE);
 109   th = xpthread_create (&a, tf, NULL);
 110   xpthread_join (th);
 111   free (thr_stack);
 112
 113   xpthread_attr_destroy (&a);
 114
 115   return 0;
 116 }
 117
 118 #include <support/test-driver.c>