/* Determine whether block of given size can be allocated on the stack or not. Copyright (C) 2002 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; see the file COPYING.LIB. If not, see <http://www.gnu.org/licenses/>. */ #include <alloca.h> #include <stdlib.h> #include <sys/param.h> #include <pthreadP.h> int __libc_alloca_cutoff (size_t size) { return size <= (MIN (__MAX_ALLOCA_CUTOFF, THREAD_GETMEM (THREAD_SELF, stackblock_size) / 4 /* The main thread, before the thread library is initialized, has zero in the stackblock_size element. Since it is the main thread we can assume the maximum available stack space. */ ?: __MAX_ALLOCA_CUTOFF * 4)); }