[thirdparty/glibc.git] / nptl / alloca_cutoff.c

/* Determine whether block of given size can be allocated on the stack or not.
   Copyright (C) 2002-2018 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));
}
libc_hidden_def (__libc_alloca_cutoff)
Commit	Line	Data
76a50749	1	/* Determine whether block of given size can be allocated on the stack or not.
688903eb	2	Copyright (C) 2002-2018 Free Software Foundation, Inc.
76a50749 UD	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
28ddcea0 RM	6	modify it under the terms of the GNU Lesser General Public License as
28ddcea0 RM	7	published by the Free Software Foundation; either version 2.1 of the
76a50749 UD	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
28ddcea0	13	Lesser General Public License for more details.
76a50749	14
28ddcea0	15	You should have received a copy of the GNU Lesser General Public
59ba27a6 PE	16	License along with the GNU C Library; see the file COPYING.LIB. If
59ba27a6 PE	17	not, see <http://www.gnu.org/licenses/>. */
76a50749 UD	18
	19	#include <alloca.h>
	20	#include <stdlib.h>
	21	#include <sys/param.h>
	22	#include <pthreadP.h>
	23
	24
	25	int
	26	__libc_alloca_cutoff (size_t size)
	27	{
	28	return size <= (MIN (__MAX_ALLOCA_CUTOFF,
	29	THREAD_GETMEM (THREAD_SELF, stackblock_size) / 4
	30	/* The main thread, before the thread library is
	31	initialized, has zero in the stackblock_size
	32	element. Since it is the main thread we can
	33	assume the maximum available stack space. */
	34	?: __MAX_ALLOCA_CUTOFF * 4));
	35	}
a85b5cb4	36	libc_hidden_def (__libc_alloca_cutoff)