FreeBSD/Linux Kernel Cross Reference
sys/sys/lockmgr.h
1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2008 Attilio Rao <attilio@FreeBSD.org>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
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.
17 *
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
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
28 * DAMAGE.
29 *
30 * $FreeBSD: releng/12.0/sys/sys/lockmgr.h 326256 2017-11-27 15:01:59Z pfg $
31 */
32
33 #ifndef _SYS_LOCKMGR_H_
34 #define _SYS_LOCKMGR_H_
35
36 #include <sys/_lock.h>
37 #include <sys/_lockmgr.h>
38 #include <sys/_mutex.h>
39 #include <sys/_rwlock.h>
40
41 #define LK_SHARE 0x01
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)
47 #define LK_FLAGMASK \
48 (LK_SHARE | LK_ALL_WAITERS | LK_EXCLUSIVE_SPINNERS)
49
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)
57
58 #ifdef _KERNEL
59
60 #if !defined(LOCK_FILE) || !defined(LOCK_LINE)
61 #error "LOCK_FILE and LOCK_LINE not defined, include <sys/lock.h> before"
62 #endif
63
64 struct thread;
65 #define lk_recurse lock_object.lo_data
66
67 /*
68 * Function prototipes. Routines that start with an underscore are not part
69 * of the public interface and might be wrappered with a macro.
70 */
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);
79 #endif
80 void _lockmgr_disown(struct lock *lk, const char *file, int line);
81
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,
88 int flags);
89 #ifdef DDB
90 int lockmgr_chain(struct thread *td, struct thread **ownerp);
91 #endif
92 void lockmgr_printinfo(const struct lock *lk);
93 int lockstatus(const struct lock *lk);
94
95 /*
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.
98 */
99 static __inline int
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)
102 {
103
104 return (__lockmgr_args(lk, flags, (ilk != NULL) ? &ilk->lock_object :
105 NULL, wmesg, prio, timo, file, line));
106 }
107
108 static __inline int
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)
111 {
112
113 return (__lockmgr_args(lk, flags, (ilk != NULL) ? &ilk->lock_object :
114 NULL, wmesg, prio, timo, file, line));
115 }
116
117 /*
118 * Define aliases in order to complete lockmgr KPI.
119 */
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)
136 #ifdef INVARIANTS
137 #define lockmgr_assert(lk, what) \
138 _lockmgr_assert((lk), (what), LOCK_FILE, LOCK_LINE)
139 #else
140 #define lockmgr_assert(lk, what)
141 #endif
142
143 /*
144 * Flags for lockinit().
145 */
146 #define LK_INIT_MASK 0x0000FF
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
156 /*
157 * Additional attributes to be used in lockmgr().
158 */
159 #define LK_EATTR_MASK 0x00FF00
160 #define LK_INTERLOCK 0x000100
161 #define LK_NOWAIT 0x000200
162 #define LK_RETRY 0x000400
163 #define LK_SLEEPFAIL 0x000800
164 #define LK_TIMELOCK 0x001000
165 #define LK_NODDLKTREAT 0x002000
166 #define LK_VNHELD 0x004000
167
168 /*
169 * Operations for lockmgr().
170 */
171 #define LK_TYPE_MASK 0xFF0000
172 #define LK_DOWNGRADE 0x010000
173 #define LK_DRAIN 0x020000
174 #define LK_EXCLOTHER 0x040000
175 #define LK_EXCLUSIVE 0x080000
176 #define LK_RELEASE 0x100000
177 #define LK_SHARED 0x200000
178 #define LK_UPGRADE 0x400000
179 #define LK_TRYUPGRADE 0x800000
180
181 #define LK_TOTAL_MASK (LK_INIT_MASK | LK_EATTR_MASK | LK_TYPE_MASK)
182
183 /*
184 * Default values for lockmgr_args().
185 */
186 #define LK_WMESG_DEFAULT (NULL)
187 #define LK_PRIO_DEFAULT (0)
188 #define LK_TIMO_DEFAULT (0)
189
190 /*
191 * Assertion flags.
192 */
193 #if defined(INVARIANTS) || defined(INVARIANT_SUPPORT)
194 #define KA_LOCKED LA_LOCKED
195 #define KA_SLOCKED LA_SLOCKED
196 #define KA_XLOCKED LA_XLOCKED
197 #define KA_UNLOCKED LA_UNLOCKED
198 #define KA_RECURSED LA_RECURSED
199 #define KA_NOTRECURSED LA_NOTRECURSED
200 #endif
201
202 #endif /* _KERNEL */
203
204 #endif /* !_SYS_LOCKMGR_H_ */
Cache object: c43e4903045b922befff1306a61d788b
|