path: root/nptl/allocatestack.c

/* Copyright (C) 2002, 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.

   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, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#include <assert.h>
#include <errno.h>
#include <signal.h>
#include <stdint.h>
#include <string.h>
#include <unistd.h>
#include <sys/mman.h>
#include <sys/param.h>
#include <dl-sysdep.h>
#include <tls.h>
#include <lowlevellock.h>


#ifndef NEED_SEPARATE_REGISTER_STACK

/* Most architectures have exactly one stack pointer.  Some have more.  */
# define STACK_VARIABLES void *stackaddr = NULL

/* How to pass the values to the 'create_thread' function.  */
# define STACK_VARIABLES_ARGS stackaddr

/* How to declare function which gets there parameters.  */
# define STACK_VARIABLES_PARMS void *stackaddr

/* How to declare allocate_stack.  */
# define ALLOCATE_STACK_PARMS void **stack

/* This is how the function is called.  We do it this way to allow
   other variants of the function to have more parameters.  */
# define ALLOCATE_STACK(attr, pd) allocate_stack (attr, pd, &stackaddr)

#else

/* We need two stacks.  The kernel will place them but we have to tell
   the kernel about the size of the reserved address space.  */
# define STACK_VARIABLES void *stackaddr = NULL; size_t stacksize = 0

/* How to pass the values to the 'create_thread' function.  */
# define STACK_VARIABLES_ARGS stackaddr, stacksize

/* How to declare function which gets there parameters.  */
# define STACK_VARIABLES_PARMS void *stackaddr, size_t stacksize

/* How to declare allocate_stack.  */
# define ALLOCATE_STACK_PARMS void **stack, size_t *stacksize

/* This is how the function is called.  We do it this way to allow
   other variants of the function to have more parameters.  */
# define ALLOCATE_STACK(attr, pd) \
  allocate_stack (attr, pd, &stackaddr, &stacksize)

#endif


/* Default alignment of stack.