FreeBSD/Linux Kernel Cross Reference
sys/osfmk/i386/hw_lock_types.h

     /*
      * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
      *
      * @APPLE_LICENSE_HEADER_START@
      * 
      * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
      * 
      * This file contains Original Code and/or Modifications of Original Code
      * as defined in and that are subject to the Apple Public Source License
     * Version 2.0 (the 'License'). You may not use this file except in
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     * file.
     * 
     * The Original Code and all software distributed under the License are
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     * Please see the License for the specific language governing rights and
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    /*
     * @OSF_COPYRIGHT@
     */
    
    /* 
     * Mach Operating System
     * Copyright (c) 1991,1990 Carnegie Mellon University
     * All Rights Reserved.
     * 
     * Permission to use, copy, modify and distribute this software and its
     * documentation is hereby granted, provided that both the copyright
     * notice and this permission notice appear in all copies of the
     * software, derivative works or modified versions, and any portions
     * thereof, and that both notices appear in supporting documentation.
     * 
     * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
     * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
     * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
     * 
     * Carnegie Mellon requests users of this software to return to
     * 
     *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
     *  School of Computer Science
     *  Carnegie Mellon University
     *  Pittsburgh PA 15213-3890
     * 
     * any improvements or extensions that they make and grant Carnegie Mellon
     * the rights to redistribute these changes.
     */
    
    /*
     * Machine-dependent simple locks for the i386.
     */
    
    #ifndef _I386_HW_LOCK_TYPES_H_
    #define _I386_HW_LOCK_TYPES_H_
    
    /*
     *      The "hardware lock".  Low-level locking primitives that
     *      MUST be exported by machine-dependent code; this abstraction
     *      must provide atomic, non-blocking mutual exclusion that
     *      is invulnerable to uniprocessor or SMP races, interrupts,
     *      traps or any other events.
     *
     *              hw_lock_data_t          machine-specific lock data structure
     *              hw_lock_t               pointer to hw_lock_data_t
     *
     *      An implementation must export these data types and must
     *      also provide routines to manipulate them (see prototypes,
     *      below).  These routines may be external, inlined, optimized,
     *      or whatever, based on the kernel configuration.  In the event
     *      that the implementation wishes to define its own prototypes,
     *      macros, or inline functions, it may define LOCK_HW_PROTOS
     *      to disable the definitions below.
     *
     *      Mach does not expect these locks to support statistics,
     *      debugging, tracing or any other complexity.  In certain
     *      configurations, Mach will build other locking constructs
     *      on top of this one.  A correctly functioning Mach port need
     *      only implement these locks to be successful.  However,
     *      greater efficiency may be gained with additional machine-
     *      dependent optimizations for the locking constructs defined
     *      later in kern/lock.h..
     */
    typedef volatile int    hw_lock_data_t;
    typedef hw_lock_data_t  *hw_lock_t;
    #define hw_lock_addr(hwl)       (&(hwl))
    
    
    #endif  /* _I386_HW_LOCK_TYPES_H_ */
    

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