uclibc-ng/libpthread/linuxthreads.old/sysdeps/bfin/pt-machine.h

/* Machine-dependent pthreads configuration and inline functions.
   Copyright (C) 1996, 1998, 2000, 2002 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Richard Henderson <rth@tamu.edu>.

   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 *, long , long);

/* Spinlock implementation; required.  */
PT_EI long int
testandset (int *spinlock)
{
	if (*spinlock)
		return 1;
	else
	{
		*spinlock=1;
		return 0;
	}
}

#define HAS_COMPARE_AND_SWAP

PT_EI int
__compare_and_swap (long int *p, long int oldval, long int newval)
{
  if((*p ^ oldval) == 0) {
	*p = newval;
	return 1;
  }
  else
	return 0;
}

#endif /* pt-machine.h */