FreeBSD/Linux Kernel Cross Reference
sys/kern/subr_lock.c
1 /*-
2 * Copyright (c) 2006 John Baldwin <jhb@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
30 /*
31 * This module holds the global variables and functions used to maintain
32 * lock_object structures.
33 */
34
35 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD: releng/6.2/sys/kern/subr_lock.c 164286 2006-11-14 20:42:41Z cvs2svn $");
37
38 #include "opt_ddb.h"
39
40 #include <sys/param.h>
41 #include <sys/systm.h>
42 #include <sys/ktr.h>
43 #include <sys/linker_set.h>
44 #include <sys/lock.h>
45
46 #ifdef DDB
47 #include <ddb/ddb.h>
48 #endif
49
50 void
51 lock_init(struct lock_object *lock, struct lock_class *class, const char *name,
52 const char *type, int flags)
53 {
54
55 /* Check for double-init and zero object. */
56 KASSERT(!lock_initalized(lock), ("lock \"%s\" %p already initialized",
57 name, lock));
58
59 /* Initialize the lock object. */
60 lock->lo_class = class;
61 lock->lo_name = name;
62 lock->lo_type = type != NULL ? type : name;
63 lock->lo_flags |= flags | LO_INITIALIZED;
64 LOCK_LOG_INIT(lock, 0);
65 WITNESS_INIT(lock);
66 }
67
68 void
69 lock_destroy(struct lock_object *lock)
70 {
71
72 KASSERT(lock_initalized(lock), ("lock %p is not initialized", lock));
73 WITNESS_DESTROY(lock);
74 LOCK_LOG_DESTROY(lock, 0);
75 lock->lo_flags &= ~LO_INITIALIZED;
76 }
77
78 #ifdef DDB
79 DB_SHOW_COMMAND(lock, db_show_lock)
80 {
81 struct lock_object *lock;
82 struct lock_class *class;
83
84 if (!have_addr)
85 return;
86 lock = (struct lock_object *)addr;
87 if (lock->lo_class != &lock_class_mtx_sleep &&
88 lock->lo_class != &lock_class_mtx_spin &&
89 lock->lo_class != &lock_class_sx) {
90 db_printf("Unknown lock class\n");
91 return;
92 }
93 class = LOCK_CLASS(lock);
94 db_printf(" class: %s\n", class->lc_name);
95 db_printf(" name: %s\n", lock->lo_name);
96 if (lock->lo_type && lock->lo_type != lock->lo_name)
97 db_printf(" type: %s\n", lock->lo_type);
98 class->lc_ddb_show(lock);
99 }
100 #endif
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