1/*-
2 * Copyright (c) 2008 Attilio Rao <attilio@FreeBSD.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice(s), this list of conditions and the following disclaimer as
10 *    the first lines of this file unmodified other than the possible
11 *    addition of one or more copyright notices.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice(s), this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
17 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
18 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
19 * DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE LIABLE FOR ANY
20 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
21 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
22 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
23 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
26 * DAMAGE.
27 *
28 * $FreeBSD$
29 */
30
31#ifndef	_SYS_LOCKMGR_H_
32#define	_SYS_LOCKMGR_H_
33
34#include <sys/_lock.h>
35#include <sys/_lockmgr.h>
36#include <sys/_mutex.h>
37#include <sys/_rwlock.h>
38
39#define	LK_SHARE			0x01
40#define	LK_SHARED_WAITERS		0x02
41#define	LK_EXCLUSIVE_WAITERS		0x04
42#define	LK_EXCLUSIVE_SPINNERS		0x08
43#define	LK_ALL_WAITERS							\
44	(LK_SHARED_WAITERS | LK_EXCLUSIVE_WAITERS)
45#define	LK_FLAGMASK							\
46	(LK_SHARE | LK_ALL_WAITERS | LK_EXCLUSIVE_SPINNERS)
47
48#define	LK_HOLDER(x)			((x) & ~LK_FLAGMASK)
49#define	LK_SHARERS_SHIFT		4
50#define	LK_SHARERS(x)			(LK_HOLDER(x) >> LK_SHARERS_SHIFT)
51#define	LK_SHARERS_LOCK(x)		((x) << LK_SHARERS_SHIFT | LK_SHARE)
52#define	LK_ONE_SHARER			(1 << LK_SHARERS_SHIFT)
53#define	LK_UNLOCKED			LK_SHARERS_LOCK(0)
54#define	LK_KERNPROC			((uintptr_t)(-1) & ~LK_FLAGMASK)
55
56#ifdef _KERNEL
57
58#if !defined(LOCK_FILE) || !defined(LOCK_LINE)
59#error	"LOCK_FILE and LOCK_LINE not defined, include <sys/lock.h> before"
60#endif
61
62struct thread;
63#define	lk_recurse	lock_object.lo_data
64
65/*
66 * Function prototipes.  Routines that start with an underscore are not part
67 * of the public interface and might be wrappered with a macro.
68 */
69int	 __lockmgr_args(struct lock *lk, u_int flags, struct lock_object *ilk,
70	    const char *wmesg, int prio, int timo, const char *file, int line);
71#if defined(INVARIANTS) || defined(INVARIANT_SUPPORT)
72void	 _lockmgr_assert(const struct lock *lk, int what, const char *file, int line);
73#endif
74void	 _lockmgr_disown(struct lock *lk, const char *file, int line);
75
76void	 lockallowrecurse(struct lock *lk);
77void	 lockallowshare(struct lock *lk);
78void	 lockdestroy(struct lock *lk);
79void	 lockdisablerecurse(struct lock *lk);
80void	 lockdisableshare(struct lock *lk);
81void	 lockinit(struct lock *lk, int prio, const char *wmesg, int timo,
82	    int flags);
83#ifdef DDB
84int	 lockmgr_chain(struct thread *td, struct thread **ownerp);
85#endif
86void	 lockmgr_printinfo(const struct lock *lk);
87int	 lockstatus(const struct lock *lk);
88
89/*
90 * As far as the ilk can be a static NULL pointer these functions need a
91 * strict prototype in order to safely use the lock_object member.
92 */
93static __inline int
94_lockmgr_args(struct lock *lk, u_int flags, struct mtx *ilk, const char *wmesg,
95    int prio, int timo, const char *file, int line)
96{
97
98	return (__lockmgr_args(lk, flags, (ilk != NULL) ? &ilk->lock_object :
99	    NULL, wmesg, prio, timo, file, line));
100}
101
102static __inline int
103_lockmgr_args_rw(struct lock *lk, u_int flags, struct rwlock *ilk,
104    const char *wmesg, int prio, int timo, const char *file, int line)
105{
106
107	return (__lockmgr_args(lk, flags, (ilk != NULL) ? &ilk->lock_object :
108	    NULL, wmesg, prio, timo, file, line));
109}
110
111/*
112 * Define aliases in order to complete lockmgr KPI.
113 */
114#define	lockmgr(lk, flags, ilk)						\
115	_lockmgr_args((lk), (flags), (ilk), LK_WMESG_DEFAULT,		\
116	    LK_PRIO_DEFAULT, LK_TIMO_DEFAULT, LOCK_FILE, LOCK_LINE)
117#define	lockmgr_args(lk, flags, ilk, wmesg, prio, timo)			\
118	_lockmgr_args((lk), (flags), (ilk), (wmesg), (prio), (timo),	\
119	    LOCK_FILE, LOCK_LINE)
120#define	lockmgr_args_rw(lk, flags, ilk, wmesg, prio, timo)		\
121	_lockmgr_args_rw((lk), (flags), (ilk), (wmesg), (prio), (timo),	\
122	    LOCK_FILE, LOCK_LINE)
123#define	lockmgr_disown(lk)						\
124	_lockmgr_disown((lk), LOCK_FILE, LOCK_LINE)
125#define	lockmgr_recursed(lk)						\
126	((lk)->lk_recurse != 0)
127#define	lockmgr_rw(lk, flags, ilk)					\
128	_lockmgr_args_rw((lk), (flags), (ilk), LK_WMESG_DEFAULT,	\
129	    LK_PRIO_DEFAULT, LK_TIMO_DEFAULT, LOCK_FILE, LOCK_LINE)
130#define	lockmgr_waiters(lk)						\
131	((lk)->lk_lock & LK_ALL_WAITERS)
132#ifdef INVARIANTS
133#define	lockmgr_assert(lk, what)					\
134	_lockmgr_assert((lk), (what), LOCK_FILE, LOCK_LINE)
135#else
136#define	lockmgr_assert(lk, what)
137#endif
138
139/*
140 * Flags for lockinit().
141 */
142#define	LK_INIT_MASK	0x0000FF
143#define	LK_CANRECURSE	0x000001
144#define	LK_NODUP	0x000002
145#define	LK_NOPROFILE	0x000004
146#define	LK_NOSHARE	0x000008
147#define	LK_NOWITNESS	0x000010
148#define	LK_QUIET	0x000020
149#define	LK_ADAPTIVE	0x000040
150#define	LK_IS_VNODE	0x000080	/* Tell WITNESS about a VNODE lock */
151
152/*
153 * Additional attributes to be used in lockmgr().
154 */
155#define	LK_EATTR_MASK	0x00FF00
156#define	LK_INTERLOCK	0x000100
157#define	LK_NOWAIT	0x000200
158#define	LK_RETRY	0x000400
159#define	LK_SLEEPFAIL	0x000800
160#define	LK_TIMELOCK	0x001000
161#define	LK_NODDLKTREAT	0x002000
162
163/*
164 * Operations for lockmgr().
165 */
166#define	LK_TYPE_MASK	0xFF0000
167#define	LK_DOWNGRADE	0x010000
168#define	LK_DRAIN	0x020000
169#define	LK_EXCLOTHER	0x040000
170#define	LK_EXCLUSIVE	0x080000
171#define	LK_RELEASE	0x100000
172#define	LK_SHARED	0x200000
173#define	LK_UPGRADE	0x400000
174#define	LK_TRYUPGRADE	0x800000
175
176#define	LK_TOTAL_MASK	(LK_INIT_MASK | LK_EATTR_MASK | LK_TYPE_MASK)
177
178/*
179 * Default values for lockmgr_args().
180 */
181#define	LK_WMESG_DEFAULT	(NULL)
182#define	LK_PRIO_DEFAULT		(0)
183#define	LK_TIMO_DEFAULT		(0)
184
185/*
186 * Assertion flags.
187 */
188#if defined(INVARIANTS) || defined(INVARIANT_SUPPORT)
189#define	KA_LOCKED	LA_LOCKED
190#define	KA_SLOCKED	LA_SLOCKED
191#define	KA_XLOCKED	LA_XLOCKED
192#define	KA_UNLOCKED	LA_UNLOCKED
193#define	KA_RECURSED	LA_RECURSED
194#define	KA_NOTRECURSED	LA_NOTRECURSED
195#endif
196
197#endif /* _KERNEL */
198
199#endif /* !_SYS_LOCKMGR_H_ */
200