Source to osfmk/ppc/hw_lock_types.h

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/*
 * Copyright (C) 1998 Apple Computer
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/* 
 * Mach Operating System
 * Copyright (c) 1991,1990 Carnegie Mellon University
 * All Rights Reserved.
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 * documentation is hereby granted, provided that both the copyright
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 * 
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#ifndef	_PPC_HW_LOCK_TYPES_H_
#define	_PPC_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.
 */

struct hslock {
	int		lock_data;
};
typedef struct hslock hw_lock_data_t, *hw_lock_t;
#define hw_lock_addr(hwl)	(&((hwl).lock_data))

#endif	/* _PPC_HW_LOCK_TYPES_H_ */