The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/kern/subr_lock.c

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    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("$FreeBSD$");
   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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