2 * Copyright (c) 2001, 2003 Daniel Eischen <deischen@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.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 LCK_DEFAULT = 0x0000, /* default is FIFO spin locks */
38 LCK_PRIORITY = 0x0001,
39 LCK_ADAPTIVE = 0x0002 /* call user-supplied handlers */
42 typedef void lock_handler_t(struct lock *, struct lockuser *);
45 struct lockreq *l_head;
46 struct lockreq *l_tail; /* only used for priority locks */
47 enum lock_type l_type;
48 lock_handler_t *l_wait; /* only used for adaptive locks */
49 lock_handler_t *l_wakeup; /* only used for adaptive locks */
52 /* Try to make this >= CACHELINESIZE */
54 struct lockuser *lr_watcher; /* only used for priority locks */
55 struct lockuser *lr_owner; /* only used for priority locks */
56 volatile int lr_locked; /* lock granted = 0, busy otherwise */
57 volatile int lr_active; /* non-zero if the lock is last lock for thread */
61 struct lockreq *lu_myreq; /* request to give up/trade */
62 struct lockreq *lu_watchreq; /* watch this request */
63 int lu_priority; /* only used for priority locks */
64 void *lu_private1; /* private{1,2} are initialized to */
65 void *lu_private2; /* NULL and can be used by caller */
66 #define lu_private lu_private1
69 #define _LCK_INITIALIZER(lck_req) { &lck_req, NULL, LCK_DEFAULT, \
71 #define _LCK_REQUEST_INITIALIZER { 0, NULL, NULL, 0 }
73 #define _LCK_BUSY(lu) ((lu)->lu_watchreq->lr_locked != 0)
74 #define _LCK_ACTIVE(lu) ((lu)->lu_watchreq->lr_active != 0)
75 #define _LCK_GRANTED(lu) ((lu)->lu_watchreq->lr_locked == 3)
77 #define _LCK_SET_PRIVATE(lu, p) (lu)->lu_private = (void *)(p)
78 #define _LCK_GET_PRIVATE(lu) (lu)->lu_private
79 #define _LCK_SET_PRIVATE2(lu, p) (lu)->lu_private2 = (void *)(p)
80 #define _LCK_GET_PRIVATE2(lu) (lu)->lu_private2
82 void _lock_acquire(struct lock *, struct lockuser *, int);
83 void _lock_destroy(struct lock *);
84 void _lock_grant(struct lock *, struct lockuser *);
85 int _lock_init(struct lock *, enum lock_type,
86 lock_handler_t *, lock_handler_t *, void *(size_t, size_t));
87 int _lock_reinit(struct lock *, enum lock_type,
88 lock_handler_t *, lock_handler_t *);
89 void _lock_release(struct lock *, struct lockuser *);
90 int _lockuser_init(struct lockuser *lu, void *priv);
91 void _lockuser_destroy(struct lockuser *lu);
92 int _lockuser_reinit(struct lockuser *lu, void *priv);
93 void _lockuser_setactive(struct lockuser *lu, int active);