text: /* Machine-specific definition for spin locks.  Stub version.
  Copyright (C) 1994 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., 675 Mass Ave,
  Cambridge, MA 02139, 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)
  {
    *__lock = 0;
  }
  
  /* Try to lock LOCK; return nonzero if we locked it, zero if another has.  */
  
  _EXTERN_INLINE int
  __spin_try_lock (__spin_lock_t *__lock)
  {
    if (*__lock)
      return 0;
    *__lock = 1;
    return 1;
  }
  
  /* Return nonzero if LOCK is locked.  */
  
  _EXTERN_INLINE int
  __spin_lock_locked (__spin_lock_t *__lock)
  {
    return *__lock != 0;
  }
  
  
  #endif /* machine-lock.h */
  