support/support_small_stack_thread_attribute.c

   1 /* A thread attribute with a small stack.
   2    Copyright (C) 2019-2022 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 #include <support/xthread.h>
  20 #include <allocate_once.h>
  21
  22 static void *
  23 allocate (void *closure)
  24 {
  25   pthread_attr_t *result = malloc (sizeof (*result));
  26   xpthread_attr_init (result);
  27   support_set_small_thread_stack_size (result);
  28   return result;
  29 }
  30
  31 static void
  32 deallocate (void *ptr, void *closure)
  33 {
  34   xpthread_attr_destroy (ptr);
  35   free (ptr);
  36 }
  37
  38 static void *small_stack_attr;
  39
  40 pthread_attr_t *
  41 support_small_stack_thread_attribute (void)
  42 {
  43   return allocate_once (&small_stack_attr, allocate, deallocate, NULL);
  44 }
  45
  46 static void __attribute__ ((destructor))
  47 fini (void)
  48 {
  49   if (small_stack_attr != NULL)
  50     {
  51       deallocate (small_stack_attr, NULL);
  52       small_stack_attr = NULL;
  53     }
  54 }