support/support_set_small_thread_stack_size.c


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/* Set a small stack size, but still large enough for glibc's needs.
   Copyright (C) 2019-2024 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <https://www.gnu.org/licenses/>.  */

#include <limits.h>
#include <pthread.h>
#include <support/xthread.h>

size_t
support_small_thread_stack_size (void)
{
  /* Some architectures have too small values for PTHREAD_STACK_MIN
     which cannot be used for creating threads.  Ensure that the stack
     size is at least 256 KiB.  */
  size_t stack_size = 256 * 1024;
#ifdef PTHREAD_STACK_MIN
  if (stack_size < PTHREAD_STACK_MIN)
    stack_size = PTHREAD_STACK_MIN;
#endif
  return stack_size;
}

void
support_set_small_thread_stack_size (pthread_attr_t *attr)
{
  xpthread_attr_setstacksize (attr, support_small_thread_stack_size ());
}