FreeBSD/Linux Kernel Cross Reference
sys/sys/rmlock.h
1 /*-
2 * Copyright (c) 2007 Stephan Uphoff <ups@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, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the author nor the names of any co-contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * $FreeBSD$
30 */
31
32 #ifndef _SYS_RMLOCK_H_
33 #define _SYS_RMLOCK_H_
34
35 #include <sys/mutex.h>
36 #include <sys/sx.h>
37 #include <sys/_lock.h>
38 #include <sys/_rmlock.h>
39
40 #ifdef _KERNEL
41
42 /*
43 * Flags passed to rm_init_flags(9).
44 */
45 #define RM_NOWITNESS 0x00000001
46 #define RM_RECURSE 0x00000002
47 #define RM_SLEEPABLE 0x00000004
48 #define RM_NEW 0x00000008
49
50 void rm_init(struct rmlock *rm, const char *name);
51 void rm_init_flags(struct rmlock *rm, const char *name, int opts);
52 void rm_destroy(struct rmlock *rm);
53 int rm_wowned(const struct rmlock *rm);
54 void rm_sysinit(void *arg);
55
56 void _rm_wlock_debug(struct rmlock *rm, const char *file, int line);
57 void _rm_wunlock_debug(struct rmlock *rm, const char *file, int line);
58 int _rm_rlock_debug(struct rmlock *rm, struct rm_priotracker *tracker,
59 int trylock, const char *file, int line);
60 void _rm_runlock_debug(struct rmlock *rm, struct rm_priotracker *tracker,
61 const char *file, int line);
62
63 void _rm_wlock(struct rmlock *rm);
64 void _rm_wunlock(struct rmlock *rm);
65 int _rm_rlock(struct rmlock *rm, struct rm_priotracker *tracker,
66 int trylock);
67 void _rm_runlock(struct rmlock *rm, struct rm_priotracker *tracker);
68 #if defined(INVARIANTS) || defined(INVARIANT_SUPPORT)
69 void _rm_assert(const struct rmlock *rm, int what, const char *file,
70 int line);
71 #endif
72
73 /*
74 * Public interface for lock operations.
75 */
76 #ifndef LOCK_DEBUG
77 #error LOCK_DEBUG not defined, include <sys/lock.h> before <sys/rmlock.h>
78 #endif
79
80 #if LOCK_DEBUG > 0
81 #define rm_wlock(rm) _rm_wlock_debug((rm), LOCK_FILE, LOCK_LINE)
82 #define rm_wunlock(rm) _rm_wunlock_debug((rm), LOCK_FILE, LOCK_LINE)
83 #define rm_rlock(rm,tracker) \
84 ((void)_rm_rlock_debug((rm),(tracker), 0, LOCK_FILE, LOCK_LINE ))
85 #define rm_try_rlock(rm,tracker) \
86 _rm_rlock_debug((rm),(tracker), 1, LOCK_FILE, LOCK_LINE )
87 #define rm_runlock(rm,tracker) \
88 _rm_runlock_debug((rm), (tracker), LOCK_FILE, LOCK_LINE )
89 #else
90 #define rm_wlock(rm) _rm_wlock((rm))
91 #define rm_wunlock(rm) _rm_wunlock((rm))
92 #define rm_rlock(rm,tracker) ((void)_rm_rlock((rm),(tracker), 0))
93 #define rm_try_rlock(rm,tracker) _rm_rlock((rm),(tracker), 1)
94 #define rm_runlock(rm,tracker) _rm_runlock((rm), (tracker))
95 #endif
96 #define rm_sleep(chan, rm, pri, wmesg, timo) \
97 _sleep((chan), &(rm)->lock_object, (pri), (wmesg), \
98 tick_sbt * (timo), 0, C_HARDCLOCK)
99
100 struct rm_args {
101 struct rmlock *ra_rm;
102 const char *ra_desc;
103 int ra_flags;
104 };
105
106 #define RM_SYSINIT_FLAGS(name, rm, desc, flags) \
107 static struct rm_args name##_args = { \
108 (rm), \
109 (desc), \
110 (flags), \
111 }; \
112 SYSINIT(name##_rm_sysinit, SI_SUB_LOCK, SI_ORDER_MIDDLE, \
113 rm_sysinit, &name##_args); \
114 SYSUNINIT(name##_rm_sysuninit, SI_SUB_LOCK, SI_ORDER_MIDDLE, \
115 rm_destroy, (rm))
116
117 #define RM_SYSINIT(name, rm, desc) RM_SYSINIT_FLAGS(name, rm, desc, 0)
118
119 #if defined(INVARIANTS) || defined(INVARIANT_SUPPORT)
120 #define RA_LOCKED LA_LOCKED
121 #define RA_RLOCKED LA_SLOCKED
122 #define RA_WLOCKED LA_XLOCKED
123 #define RA_UNLOCKED LA_UNLOCKED
124 #define RA_RECURSED LA_RECURSED
125 #define RA_NOTRECURSED LA_NOTRECURSED
126 #endif
127
128 #ifdef INVARIANTS
129 #define rm_assert(rm, what) _rm_assert((rm), (what), LOCK_FILE, LOCK_LINE)
130 #else
131 #define rm_assert(rm, what)
132 #endif
133
134 #endif /* _KERNEL */
135 #endif /* !_SYS_RMLOCK_H_ */
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