/* Copyright (C) 2003 Free Software Foundation, Inc.   This file is part of the GNU C Library.   Contributed by Paul Mackerras <paulus@au.ibm.com>, 2003.   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 <errno.h>#include "pthreadP.h"intpthread_spin_trylock (lock)     pthread_spinlock_t *lock;{  unsigned int old;  int err = EBUSY;  asm ("1:	lwarx	%0,0,%2\n"       "	cmpwi	0,%0,0\n"       "	bne	2f\n"       "	stwcx.	%3,0,%2\n"       "	bne-	1b\n"       "	li	%1,0\n"       "	isync\n"       "2:	"       : "=&r" (old), "=&r" (err)       : "r" (lock), "r" (1), "1" (err)       : "cr0", "memory");  return err;}