2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2008 Attilio Rao <attilio@FreeBSD.org>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice(s), this list of conditions and the following disclaimer as
12 * the first lines of this file unmodified other than the possible
13 * addition of one or more copyright notices.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice(s), this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
19 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
20 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE LIABLE FOR ANY
22 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
23 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
33 #ifndef _SYS_LOCKMGR_H_
34 #define _SYS_LOCKMGR_H_
36 #include <sys/_lock.h>
37 #include <sys/_lockmgr.h>
38 #include <sys/_mutex.h>
39 #include <sys/_rwlock.h>
42 #define LK_SHARED_WAITERS 0x02
43 #define LK_EXCLUSIVE_WAITERS 0x04
44 #define LK_EXCLUSIVE_SPINNERS 0x08
45 #define LK_ALL_WAITERS \
46 (LK_SHARED_WAITERS | LK_EXCLUSIVE_WAITERS)
48 (LK_SHARE | LK_ALL_WAITERS | LK_EXCLUSIVE_SPINNERS)
50 #define LK_HOLDER(x) ((x) & ~LK_FLAGMASK)
51 #define LK_SHARERS_SHIFT 4
52 #define LK_SHARERS(x) (LK_HOLDER(x) >> LK_SHARERS_SHIFT)
53 #define LK_SHARERS_LOCK(x) ((x) << LK_SHARERS_SHIFT | LK_SHARE)
54 #define LK_ONE_SHARER (1 << LK_SHARERS_SHIFT)
55 #define LK_UNLOCKED LK_SHARERS_LOCK(0)
56 #define LK_KERNPROC ((uintptr_t)(-1) & ~LK_FLAGMASK)
60 #if !defined(LOCK_FILE) || !defined(LOCK_LINE)
61 #error "LOCK_FILE and LOCK_LINE not defined, include <sys/lock.h> before"
65 #define lk_recurse lock_object.lo_data
68 * Function prototipes. Routines that start with an underscore are not part
69 * of the public interface and might be wrappered with a macro.
71 int __lockmgr_args(struct lock *lk, u_int flags, struct lock_object *ilk,
72 const char *wmesg, int prio, int timo, const char *file, int line);
73 int lockmgr_lock_fast_path(struct lock *lk, u_int flags,
74 struct lock_object *ilk, const char *file, int line);
75 int lockmgr_unlock_fast_path(struct lock *lk, u_int flags,
76 struct lock_object *ilk);
77 #if defined(INVARIANTS) || defined(INVARIANT_SUPPORT)
78 void _lockmgr_assert(const struct lock *lk, int what, const char *file, int line);
80 void _lockmgr_disown(struct lock *lk, const char *file, int line);
82 void lockallowrecurse(struct lock *lk);
83 void lockallowshare(struct lock *lk);
84 void lockdestroy(struct lock *lk);
85 void lockdisablerecurse(struct lock *lk);
86 void lockdisableshare(struct lock *lk);
87 void lockinit(struct lock *lk, int prio, const char *wmesg, int timo,
90 int lockmgr_chain(struct thread *td, struct thread **ownerp);
92 void lockmgr_printinfo(const struct lock *lk);
93 int lockstatus(const struct lock *lk);
96 * As far as the ilk can be a static NULL pointer these functions need a
97 * strict prototype in order to safely use the lock_object member.
100 _lockmgr_args(struct lock *lk, u_int flags, struct mtx *ilk, const char *wmesg,
101 int prio, int timo, const char *file, int line)
104 return (__lockmgr_args(lk, flags, (ilk != NULL) ? &ilk->lock_object :
105 NULL, wmesg, prio, timo, file, line));
109 _lockmgr_args_rw(struct lock *lk, u_int flags, struct rwlock *ilk,
110 const char *wmesg, int prio, int timo, const char *file, int line)
113 return (__lockmgr_args(lk, flags, (ilk != NULL) ? &ilk->lock_object :
114 NULL, wmesg, prio, timo, file, line));
118 * Define aliases in order to complete lockmgr KPI.
120 #define lockmgr(lk, flags, ilk) \
121 _lockmgr_args((lk), (flags), (ilk), LK_WMESG_DEFAULT, \
122 LK_PRIO_DEFAULT, LK_TIMO_DEFAULT, LOCK_FILE, LOCK_LINE)
123 #define lockmgr_args(lk, flags, ilk, wmesg, prio, timo) \
124 _lockmgr_args((lk), (flags), (ilk), (wmesg), (prio), (timo), \
125 LOCK_FILE, LOCK_LINE)
126 #define lockmgr_args_rw(lk, flags, ilk, wmesg, prio, timo) \
127 _lockmgr_args_rw((lk), (flags), (ilk), (wmesg), (prio), (timo), \
128 LOCK_FILE, LOCK_LINE)
129 #define lockmgr_disown(lk) \
130 _lockmgr_disown((lk), LOCK_FILE, LOCK_LINE)
131 #define lockmgr_recursed(lk) \
132 ((lk)->lk_recurse != 0)
133 #define lockmgr_rw(lk, flags, ilk) \
134 _lockmgr_args_rw((lk), (flags), (ilk), LK_WMESG_DEFAULT, \
135 LK_PRIO_DEFAULT, LK_TIMO_DEFAULT, LOCK_FILE, LOCK_LINE)
137 #define lockmgr_assert(lk, what) \
138 _lockmgr_assert((lk), (what), LOCK_FILE, LOCK_LINE)
140 #define lockmgr_assert(lk, what)
144 * Flags for lockinit().
146 #define LK_INIT_MASK 0x0001FF
147 #define LK_CANRECURSE 0x000001
148 #define LK_NODUP 0x000002
149 #define LK_NOPROFILE 0x000004
150 #define LK_NOSHARE 0x000008
151 #define LK_NOWITNESS 0x000010
152 #define LK_QUIET 0x000020
153 #define LK_ADAPTIVE 0x000040
154 #define LK_IS_VNODE 0x000080 /* Tell WITNESS about a VNODE lock */
155 #define LK_NEW 0x000100
158 * Additional attributes to be used in lockmgr().
160 #define LK_EATTR_MASK 0x00FF00
161 #define LK_INTERLOCK 0x000100
162 #define LK_NOWAIT 0x000200
163 #define LK_RETRY 0x000400
164 #define LK_SLEEPFAIL 0x000800
165 #define LK_TIMELOCK 0x001000
166 #define LK_NODDLKTREAT 0x002000
167 #define LK_VNHELD 0x004000
170 * Operations for lockmgr().
172 #define LK_TYPE_MASK 0xFF0000
173 #define LK_DOWNGRADE 0x010000
174 #define LK_DRAIN 0x020000
175 #define LK_EXCLOTHER 0x040000
176 #define LK_EXCLUSIVE 0x080000
177 #define LK_RELEASE 0x100000
178 #define LK_SHARED 0x200000
179 #define LK_UPGRADE 0x400000
180 #define LK_TRYUPGRADE 0x800000
182 #define LK_TOTAL_MASK (LK_INIT_MASK | LK_EATTR_MASK | LK_TYPE_MASK)
185 * Default values for lockmgr_args().
187 #define LK_WMESG_DEFAULT (NULL)
188 #define LK_PRIO_DEFAULT (0)
189 #define LK_TIMO_DEFAULT (0)
194 #if defined(INVARIANTS) || defined(INVARIANT_SUPPORT)
195 #define KA_LOCKED LA_LOCKED
196 #define KA_SLOCKED LA_SLOCKED
197 #define KA_XLOCKED LA_XLOCKED
198 #define KA_UNLOCKED LA_UNLOCKED
199 #define KA_RECURSED LA_RECURSED
200 #define KA_NOTRECURSED LA_NOTRECURSED
205 #endif /* !_SYS_LOCKMGR_H_ */