htl/tests/test-8.c

   1 /* Test pthread_once.
   2    Copyright (C) 2000-2022 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library 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 GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library;  if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #define _GNU_SOURCE
  20
  21 #include <pthread.h>
  22 #include <assert.h>
  23 #include <error.h>
  24 #include <errno.h>
  25
  26 #define THREADS 10
  27
  28 pthread_once_t inc_var_once = PTHREAD_ONCE_INIT;
  29 int var;
  30
  31 void
  32 inc_var (void)
  33 {
  34   var++;
  35 }
  36
  37 void *
  38 thr (void *arg)
  39 {
  40   int i;
  41
  42   for (i = 0; i < 500; i++)
  43     pthread_once (&inc_var_once, inc_var);
  44
  45   return 0;
  46 }
  47
  48 int
  49 main (int argc, char **argv)
  50 {
  51   error_t err;
  52   int i;
  53   pthread_t tid[THREADS];
  54
  55   for (i = 0; i < THREADS; i++)
  56     {
  57       err = pthread_create (&tid[i], 0, thr, 0);
  58       if (err)
  59         error (1, err, "pthread_create (%d)", i);
  60     }
  61
  62   assert (thr (0) == 0);
  63
  64   for (i = 0; i < THREADS; i++)
  65     {
  66       void *ret;
  67
  68       err = pthread_join (tid[i], &ret);
  69       if (err)
  70         error (1, err, "pthread_join");
  71
  72       assert (ret == 0);
  73     }
  74
  75   assert (var == 1);
  76
  77   return 0;
  78 }