/* Machine-specific definition for spin locks.  i386 version.   Copyright (C) 1994,1997,2007,2008 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 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.  */#ifndef _MACHINE_LOCK_H#define	_MACHINE_LOCK_H/* The type of a spin lock variable.  */typedef __volatile int __spin_lock_t;/* Value to initialize `__spin_lock_t' variables to.  */#define	__SPIN_LOCK_INITIALIZER	0#ifndef _EXTERN_INLINE#define _EXTERN_INLINE __extern_inline#endif/* Unlock LOCK.  */_EXTERN_INLINE void__spin_unlock (__spin_lock_t *__lock){   register int __unlocked;   __asm__ __volatile ("xchgl %0, %1"		       : "=&r" (__unlocked), "=m" (*__lock) : "0" (0)		       : "memory");}/* Try to lock LOCK; return nonzero if we locked it, zero if another has.  */_EXTERN_INLINE int__spin_try_lock (__spin_lock_t *__lock){  register int __locked;  __asm__ __volatile ("xchgl %0, %1"		      : "=&r" (__locked), "=m" (*__lock) : "0" (1)		      : "memory");  return !__locked;}/* Return nonzero if LOCK is locked.  */_EXTERN_INLINE int__spin_lock_locked (__spin_lock_t *__lock){  return *__lock != 0;}#endif /* machine-lock.h */