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/*-
* Copyright (c) 2006 John Baldwin <jhb@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the author nor the names of any co-contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* This module holds the global variables and functions used to maintain
* lock_object structures.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_ddb.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/ktr.h>
#include <sys/linker_set.h>
#include <sys/lock.h>
#ifdef DDB
#include <ddb/ddb.h>
#endif
CTASSERT(LOCK_CLASS_MAX == 15);
struct lock_class *lock_classes[LOCK_CLASS_MAX + 1] = {
&lock_class_mtx_spin,
&lock_class_mtx_sleep,
&lock_class_sx,
&lock_class_rw,
};
void
lock_init(struct lock_object *lock, struct lock_class *class, const char *name,
const char *type, int flags)
{
int i;
/* Check for double-init and zero object. */
KASSERT(!lock_initalized(lock), ("lock \"%s\" %p already initialized",
name, lock));
/* Look up lock class to find its index. */
for (i = 0; i < LOCK_CLASS_MAX; i++)
if (lock_classes[i] == class) {
lock->lo_flags = i << LO_CLASSSHIFT;
break;
}
KASSERT(i < LOCK_CLASS_MAX, ("unknown lock class %p", class));
/* Initialize the lock object. */
lock->lo_name = name;
lock->lo_type = type != NULL ? type : name;
lock->lo_flags |= flags | LO_INITIALIZED;
LOCK_LOG_INIT(lock, 0);
WITNESS_INIT(lock);
}
void
lock_destroy(struct lock_object *lock)
{
KASSERT(lock_initalized(lock), ("lock %p is not initialized", lock));
WITNESS_DESTROY(lock);
LOCK_LOG_DESTROY(lock, 0);
lock->lo_flags &= ~LO_INITIALIZED;
}
#ifdef DDB
DB_SHOW_COMMAND(lock, db_show_lock)
{
struct lock_object *lock;
struct lock_class *class;
if (!have_addr)
return;
lock = (struct lock_object *)addr;
if (LO_CLASSINDEX(lock) > LOCK_CLASS_MAX) {
db_printf("Unknown lock class: %d\n", LO_CLASSINDEX(lock));
return;
}
class = LOCK_CLASS(lock);
db_printf(" class: %s\n", class->lc_name);
db_printf(" name: %s\n", lock->lo_name);
if (lock->lo_type && lock->lo_type != lock->lo_name)
db_printf(" type: %s\n", lock->lo_type);
class->lc_ddb_show(lock);
}
#endif
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