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

/* 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 Library General Public License as
   published by the Free Software Foundation; either version 2 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
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with the GNU C Library; see the file COPYING.LIB.  If not,
   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#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));
}
Commit	Line	Data
76a50749 UD	1	/* Determine whether block of given size can be allocated on the stack or not.
	2	Copyright (C) 2002 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
a334319f UD	6	modify it under the terms of the GNU Library General Public License as
a334319f UD	7	published by the Free Software Foundation; either version 2 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
a334319f	13	Library General Public License for more details.
76a50749	14
a334319f	15	You should have received a copy of the GNU Library General Public
76a50749 UD	16	License along with the GNU C Library; see the file COPYING.LIB. If not,
	17	write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
	18	Boston, MA 02111-1307, USA. */
	19
	20	#include <alloca.h>
	21	#include <stdlib.h>
	22	#include <sys/param.h>
	23	#include <pthreadP.h>
	24
	25
	26	int
	27	__libc_alloca_cutoff (size_t size)
	28	{
	29	return size <= (MIN (__MAX_ALLOCA_CUTOFF,
	30	THREAD_GETMEM (THREAD_SELF, stackblock_size) / 4
	31	/* The main thread, before the thread library is
	32	initialized, has zero in the stackblock_size
	33	element. Since it is the main thread we can
	34	assume the maximum available stack space. */
	35	?: __MAX_ALLOCA_CUTOFF * 4));
	36	}