sysdeps/pthread/allocalim.h

   1 /* Determine whether block of given size can be allocated on the stack or not.
   2    Copyright (C) 2002-2018 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 License as
   7    published by the Free Software Foundation; either version 2.1 of the
   8    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; see the file COPYING.LIB.  If
  17    not, see <http://www.gnu.org/licenses/>.  */
  18
  19 #include <alloca.h>
  20 #include <limits.h>
  21
  22
  23 extern __always_inline
  24 int
  25 __libc_use_alloca (size_t size)
  26 {
  27   return (
  28 #ifdef PTHREAD_STACK_MIN
  29           __builtin_expect (size <= PTHREAD_STACK_MIN / 4, 1) ||
  30 #endif
  31           __builtin_expect (__libc_alloca_cutoff (size), 1));
  32 }