Subversion Repositories or1k

/* Machine-dependent pthreads configuration and inline functions.

   ARM version.

   Copyright (C) 1997, 1998, 2000, 2002 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   Contributed by Philip Blundell <philb@gnu.org>.

   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,

   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,

   Boston, MA 02111-1307, USA.  */

#ifndef _PT_MACHINE_H

#define _PT_MACHINE_H   1

#ifndef PT_EI

# define PT_EI extern inline

#endif

extern long int testandset (int *spinlock);

extern int __compare_and_swap (long int *p, long int oldval, long int newval);

/* This will not work on ARM1 or ARM2 because SWP is lacking on those

   machines.  Unfortunately we have no way to detect this at compile

   time; let's hope nobody tries to use one.  */

/* Spinlock implementation; required.  */

PT_EI long int

testandset (int *spinlock)

{

  register unsigned int ret;

  __asm__ __volatile__("swp %0, %1, [%2]"

                       : "=r"(ret)

                       : "0"(1), "r"(spinlock));

  return ret;

}

/* Get some notion of the current stack.  Need not be exactly the top

   of the stack, just something somewhere in the current frame.  */

#define CURRENT_STACK_FRAME  stack_pointer

register char * stack_pointer __asm__ ("sp");

#endif /* pt-machine.h */