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/* Allocate a new stack. L4 Hurd version.
Copyright (C) 2000 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 <l4.h>
#include <errno.h>
#include <sys/mman.h>
#include <pt-internal.h>
#define __pthread_stacksize __pthread_default_attr.stacksize
static void *
allocate_page (void)
{
return mmap
(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
}
/* Allocate a new stack of size STACKSIZE. If successfull, store the
address of the newly allocated stack in *STACKADDR and return 0.
Otherwise return an error code (EINVAL for an invalid stack size,
EAGAIN if the system lacked the necessary resources to allocate a
new stack). */
int
__pthread_stack_alloc (void **stackaddr, size_t stacksize)
{
if (stacksize != __pthread_stacksize)
return EINVAL;
*stackaddr = allocate_page ();
if (! *stackaddr)
return EAGAIN;
return 0;
}
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