support/support_set_small_thread_stack_size.c

   1 /* Set a small stack size, but still large enough for glibc's needs.
   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 <limits.h>
  20 #include <pthread.h>
  21 #include <support/xthread.h>
  22
  23 size_t
  24 support_small_thread_stack_size (void)
  25 {
  26   /* Some architectures have too small values for PTHREAD_STACK_MIN
  27      which cannot be used for creating threads.  Ensure that the stack
  28      size is at least 256 KiB.  */
  29   size_t stack_size = 256 * 1024;
  30 #ifdef PTHREAD_STACK_MIN
  31   if (stack_size < PTHREAD_STACK_MIN)
  32     stack_size = PTHREAD_STACK_MIN;
  33 #endif
  34   return stack_size;
  35 }
  36
  37 void
  38 support_set_small_thread_stack_size (pthread_attr_t *attr)
  39 {
  40   xpthread_attr_setstacksize (attr, support_small_thread_stack_size ());
  41 }