locks.h

/*
 * Copyright (c) 2003-2007 Apple Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 * 
 * 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
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 * 
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
 */

#ifndef _KERN_LOCKS_H_
#define _KERN_LOCKS_H_

#include	<sys/cdefs.h>
#include	<sys/appleapiopts.h>
#include	<mach/boolean.h>
#include	<mach/mach_types.h>
#include	<kern/kern_types.h>
#include	<machine/locks.h>

#ifdef	MACH_KERNEL_PRIVATE
#include	<kern/queue.h>

extern void				lck_mod_init(
								void) __attribute__((section("__TEXT, initcode")));

typedef	unsigned int	lck_type_t;

#define	LCK_TYPE_SPIN	1
#define	LCK_TYPE_MTX	2
#define	LCK_TYPE_RW	3

#endif

typedef	unsigned int		lck_sleep_action_t;

#define	LCK_SLEEP_DEFAULT	0x00	/* Release the lock while waiting for the event, then reclaim */
									/* RW locks are returned in the same mode */
#define	LCK_SLEEP_UNLOCK	0x01	/* Release the lock and return unheld */
#define	LCK_SLEEP_SHARED	0x02	/* Reclaim the lock in shared mode (RW only) */
#define	LCK_SLEEP_EXCLUSIVE	0x04	/* Reclaim the lock in exclusive mode (RW only) */
#define	LCK_SLEEP_SPIN		0x08	/* Reclaim the lock in spin mode (mutex only) */

#define	LCK_SLEEP_MASK		0x0f	/* Valid actions */

#ifdef	MACH_KERNEL_PRIVATE

typedef struct {
	uint64_t			lck_grp_spin_util_cnt;
	uint64_t			lck_grp_spin_held_cnt;
	uint64_t			lck_grp_spin_miss_cnt;
	uint64_t			lck_grp_spin_held_max;
	uint64_t			lck_grp_spin_held_cum;
} lck_grp_spin_stat_t;

typedef struct {
	uint64_t			lck_grp_mtx_util_cnt;
	/* On x86, this is used as the "direct wait" count */
	uint64_t			lck_grp_mtx_held_cnt;
	uint64_t			lck_grp_mtx_miss_cnt;
	uint64_t			lck_grp_mtx_wait_cnt;
	/* Rest currently unused */
	uint64_t			lck_grp_mtx_held_max;
	uint64_t			lck_grp_mtx_held_cum;
	uint64_t			lck_grp_mtx_wait_max;
	uint64_t			lck_grp_mtx_wait_cum;
} lck_grp_mtx_stat_t;

typedef struct {
	uint64_t			lck_grp_rw_util_cnt;
	uint64_t			lck_grp_rw_held_cnt;
	uint64_t			lck_grp_rw_miss_cnt;
	uint64_t			lck_grp_rw_wait_cnt;
	uint64_t			lck_grp_rw_held_max;
	uint64_t			lck_grp_rw_held_cum;
	uint64_t			lck_grp_rw_wait_max;
	uint64_t			lck_grp_rw_wait_cum;
} lck_grp_rw_stat_t;

typedef	struct _lck_grp_stat_ {
	lck_grp_spin_stat_t	lck_grp_spin_stat;
	lck_grp_mtx_stat_t	lck_grp_mtx_stat;
	lck_grp_rw_stat_t	lck_grp_rw_stat;
} lck_grp_stat_t;

#define	LCK_GRP_MAX_NAME	64

typedef	struct _lck_grp_ {
	queue_chain_t		lck_grp_link;
	uint32_t		lck_grp_refcnt;
	uint32_t		lck_grp_spincnt;
	uint32_t		lck_grp_mtxcnt;
	uint32_t		lck_grp_rwcnt;
	uint32_t		lck_grp_attr;
	char			lck_grp_name[LCK_GRP_MAX_NAME];
	lck_grp_stat_t		lck_grp_stat;
} lck_grp_t;

#define LCK_GRP_NULL	(lck_grp_t *)0

#else
typedef struct __lck_grp__ lck_grp_t;
#endif

#ifdef	MACH_KERNEL_PRIVATE
typedef	struct _lck_grp_attr_ {
	uint32_t	grp_attr_val;
} lck_grp_attr_t;

extern lck_grp_attr_t  LockDefaultGroupAttr;

#define LCK_GRP_ATTR_STAT	0x1

#else
typedef struct __lck_grp_attr__ lck_grp_attr_t;
#endif

#define LCK_GRP_ATTR_NULL	(lck_grp_attr_t *)0

__BEGIN_DECLS

extern	lck_grp_attr_t	*lck_grp_attr_alloc_init(
									void);

extern	void			lck_grp_attr_setdefault(
									lck_grp_attr_t	*attr);

extern	void			lck_grp_attr_setstat(
									lck_grp_attr_t  *attr);

extern	void			lck_grp_attr_free(
									lck_grp_attr_t	*attr);

extern	lck_grp_t		*lck_grp_alloc_init(
									const char*		grp_name,
									lck_grp_attr_t	*attr);

__END_DECLS

#ifdef	MACH_KERNEL_PRIVATE
extern	void			lck_grp_init(
									lck_grp_t		*grp,
									const char*		grp_name,
									lck_grp_attr_t	*attr);

extern	void			lck_grp_reference(
									lck_grp_t		*grp);

extern	void			lck_grp_deallocate(
									lck_grp_t		 *grp);

extern	void			lck_grp_lckcnt_incr(
									lck_grp_t		*grp,
									lck_type_t		lck_type);

extern	void			lck_grp_lckcnt_decr(
									lck_grp_t		*grp,
									lck_type_t		lck_type);
#endif

__BEGIN_DECLS

extern void				lck_grp_free(
									lck_grp_t		*grp);

__END_DECLS

#ifdef	MACH_KERNEL_PRIVATE
typedef	struct _lck_attr_ {
	unsigned int	lck_attr_val;
} lck_attr_t;

extern lck_attr_t      LockDefaultLckAttr;

#define LCK_ATTR_NONE		0

#define	LCK_ATTR_DEBUG				0x00000001
#define	LCK_ATTR_RW_SHARED_PRIORITY	0x00010000

#else
typedef struct __lck_attr__ lck_attr_t;
#endif

#define LCK_ATTR_NULL (lck_attr_t *)0

__BEGIN_DECLS

extern	lck_attr_t		*lck_attr_alloc_init(
									void);

extern	void			lck_attr_setdefault(
									lck_attr_t		*attr);

extern	void			lck_attr_setdebug(
									lck_attr_t		*attr);

extern	void			lck_attr_cleardebug(
									lck_attr_t		*attr);

#ifdef	XNU_KERNEL_PRIVATE
extern	void			lck_attr_rw_shared_priority(
									lck_attr_t		*attr);
#endif

extern	void			lck_attr_free(
									lck_attr_t		*attr);

#define decl_lck_spin_data(class,name)     class lck_spin_t name;

extern lck_spin_t		*lck_spin_alloc_init(
									lck_grp_t		*grp,
									lck_attr_t		*attr);

extern void				lck_spin_init(
									lck_spin_t		*lck, 
									lck_grp_t		*grp,
									lck_attr_t		*attr);

extern void				lck_spin_lock(
									lck_spin_t		*lck);

extern void				lck_spin_unlock(
									lck_spin_t		*lck);

extern void				lck_spin_destroy(
									lck_spin_t		*lck,
									lck_grp_t		*grp);

extern void				lck_spin_free(
									lck_spin_t		*lck,
									lck_grp_t		*grp);

extern wait_result_t	lck_spin_sleep(
									lck_spin_t			*lck,
									lck_sleep_action_t	lck_sleep_action,
									event_t				event,
									wait_interrupt_t	interruptible);

extern wait_result_t	lck_spin_sleep_deadline(
									lck_spin_t			*lck,
									lck_sleep_action_t	lck_sleep_action,
									event_t				event,
									wait_interrupt_t	interruptible,
									uint64_t			deadline);

#ifdef	KERNEL_PRIVATE

extern boolean_t		lck_spin_try_lock(
									lck_spin_t		*lck);

struct _lck_mtx_ext_;
extern void lck_mtx_init_ext(lck_mtx_t *lck, struct _lck_mtx_ext_ *lck_ext,
    lck_grp_t *grp, lck_attr_t *attr);

#endif


#define decl_lck_mtx_data(class,name)     class lck_mtx_t name;

extern lck_mtx_t		*lck_mtx_alloc_init(
									lck_grp_t		*grp,
									lck_attr_t		*attr);

extern void				lck_mtx_init(
									lck_mtx_t		*lck, 
									lck_grp_t		*grp,
									lck_attr_t		*attr);
extern void				lck_mtx_lock(
									lck_mtx_t		*lck);

extern void				lck_mtx_unlock(
									lck_mtx_t		*lck);
extern void				lck_mtx_destroy(
									lck_mtx_t		*lck,
									lck_grp_t		*grp);

extern void				lck_mtx_free(
									lck_mtx_t		*lck,
									lck_grp_t		*grp);

extern wait_result_t	lck_mtx_sleep(
									lck_mtx_t			*lck,
									lck_sleep_action_t	lck_sleep_action,
									event_t				event,
									wait_interrupt_t	interruptible);

extern wait_result_t	lck_mtx_sleep_deadline(
									lck_mtx_t			*lck,
									lck_sleep_action_t	lck_sleep_action,
									event_t				event,
									wait_interrupt_t	interruptible,
									uint64_t			deadline);

#ifdef	KERNEL_PRIVATE

extern boolean_t		lck_mtx_try_lock(
									lck_mtx_t		*lck);

extern void				mutex_pause(uint32_t);

extern void 			lck_mtx_yield (
									lck_mtx_t		*lck);

#if defined(i386) || defined(x86_64)
extern boolean_t		lck_mtx_try_lock_spin(
									lck_mtx_t		*lck);

extern void			lck_mtx_lock_spin(
									lck_mtx_t		*lck);

extern void			lck_mtx_convert_spin(
									lck_mtx_t		*lck);
#else
#define lck_mtx_try_lock_spin(l)	lck_mtx_try_lock(l)
#define	lck_mtx_lock_spin(l)		lck_mtx_lock(l)
#define	lck_mtx_convert_spin(l)		do {} while (0)
#endif

#endif	/* KERNEL_PRIVATE */

extern void				lck_mtx_assert(
									lck_mtx_t		*lck,
									unsigned int	type);

__END_DECLS

#define	LCK_MTX_ASSERT_OWNED	0x01
#define	LCK_MTX_ASSERT_NOTOWNED	0x02

#ifdef	MACH_KERNEL_PRIVATE
extern void				lck_mtx_lock_wait(
									lck_mtx_t		*lck,
									thread_t		holder);

extern int				lck_mtx_lock_acquire(
									lck_mtx_t		*lck);

extern void				lck_mtx_unlock_wakeup(
									lck_mtx_t		*lck,
									thread_t		holder);
extern void				lck_mtx_unlockspin_wakeup(
							                lck_mtx_t		*lck);

extern boolean_t		lck_mtx_ilk_unlock(
									lck_mtx_t		*lck);

#endif

#define decl_lck_rw_data(class,name)     class lck_rw_t name;

typedef unsigned int	 lck_rw_type_t;

#define	LCK_RW_TYPE_SHARED			0x01
#define	LCK_RW_TYPE_EXCLUSIVE		0x02

#ifdef XNU_KERNEL_PRIVATE
#define LCK_RW_ASSERT_SHARED	0x01
#define LCK_RW_ASSERT_EXCLUSIVE	0x02
#define LCK_RW_ASSERT_HELD	(LCK_RW_ASSERT_SHARED | LCK_RW_ASSERT_EXCLUSIVE)
#endif

__BEGIN_DECLS

extern lck_rw_t			*lck_rw_alloc_init(
									lck_grp_t		*grp,
									lck_attr_t		*attr);

extern void				lck_rw_init(
									lck_rw_t		*lck, 
									lck_grp_t		*grp,
									lck_attr_t		*attr);

extern void				lck_rw_lock(
									lck_rw_t		*lck,
									lck_rw_type_t	lck_rw_type);

extern void				lck_rw_unlock(
									lck_rw_t		*lck,
									lck_rw_type_t	lck_rw_type);

extern void				lck_rw_lock_shared(
									lck_rw_t		*lck);

extern void				lck_rw_unlock_shared(
									lck_rw_t		*lck);

extern void				lck_rw_lock_exclusive(
									lck_rw_t		*lck);

extern void				lck_rw_unlock_exclusive(
									lck_rw_t		*lck);

#ifdef	XNU_KERNEL_PRIVATE
/*
 * CAUTION
 * read-write locks do not have a concept of ownership, so lck_rw_assert()
 * merely asserts that someone is holding the lock, not necessarily the caller.
 */
extern void				lck_rw_assert(
									lck_rw_t		*lck,
									unsigned int		type);
#endif

#ifdef	KERNEL_PRIVATE

extern lck_rw_type_t	lck_rw_done(
									lck_rw_t		*lck);
#endif

extern void				lck_rw_destroy(
									lck_rw_t		*lck,
									lck_grp_t		*grp);

extern void				lck_rw_free(
									lck_rw_t		*lck,
									lck_grp_t		*grp);

extern wait_result_t	lck_rw_sleep(
									lck_rw_t			*lck,
									lck_sleep_action_t	lck_sleep_action,
									event_t				event,
									wait_interrupt_t	interruptible);

extern wait_result_t	lck_rw_sleep_deadline(
									lck_rw_t			*lck,
									lck_sleep_action_t	lck_sleep_action,
									event_t				event,
									wait_interrupt_t	interruptible,
									uint64_t			deadline);

extern boolean_t		lck_rw_lock_shared_to_exclusive(
									lck_rw_t		*lck);

extern void				lck_rw_lock_exclusive_to_shared(
									lck_rw_t		*lck);

extern boolean_t		lck_rw_try_lock(
									lck_rw_t		*lck,
									lck_rw_type_t	lck_rw_type);

#ifdef	KERNEL_PRIVATE

extern boolean_t		lck_rw_try_lock_shared(
									lck_rw_t		*lck);

extern boolean_t		lck_rw_try_lock_exclusive(
									lck_rw_t		*lck);
#endif

__END_DECLS

#endif /* _KERN_LOCKS_H_ */