2 * Copyright (c) 2006 John Baldwin <jhb@FreeBSD.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
31 * This module holds the global variables and functions used to maintain
32 * lock_object structures.
35 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD$");
40 #include <sys/param.h>
41 #include <sys/systm.h>
43 #include <sys/linker_set.h>
50 CTASSERT(LOCK_CLASS_MAX == 15);
52 struct lock_class *lock_classes[LOCK_CLASS_MAX + 1] = {
54 &lock_class_mtx_sleep,
59 lock_init(struct lock_object *lock, struct lock_class *class, const char *name,
60 const char *type, int flags)
64 /* Check for double-init and zero object. */
65 KASSERT(!lock_initalized(lock), ("lock \"%s\" %p already initialized",
68 /* Look up lock class to find its index. */
69 for (i = 0; i < LOCK_CLASS_MAX; i++)
70 if (lock_classes[i] == class) {
71 lock->lo_flags = i << LO_CLASSSHIFT;
74 KASSERT(i < LOCK_CLASS_MAX, ("unknown lock class %p", class));
76 /* Initialize the lock object. */
78 lock->lo_type = type != NULL ? type : name;
79 lock->lo_flags |= flags | LO_INITIALIZED;
80 LOCK_LOG_INIT(lock, 0);
85 lock_destroy(struct lock_object *lock)
88 KASSERT(lock_initalized(lock), ("lock %p is not initialized", lock));
89 WITNESS_DESTROY(lock);
90 LOCK_LOG_DESTROY(lock, 0);
91 lock->lo_flags &= ~LO_INITIALIZED;
95 DB_SHOW_COMMAND(lock, db_show_lock)
97 struct lock_object *lock;
98 struct lock_class *class;
102 lock = (struct lock_object *)addr;
103 if (LO_CLASSINDEX(lock) > LOCK_CLASS_MAX) {
104 db_printf("Unknown lock class: %d\n", LO_CLASSINDEX(lock));
107 class = LOCK_CLASS(lock);
108 db_printf(" class: %s\n", class->lc_name);
109 db_printf(" name: %s\n", lock->lo_name);
110 if (lock->lo_type && lock->lo_type != lock->lo_name)
111 db_printf(" type: %s\n", lock->lo_type);
112 class->lc_ddb_show(lock);