FreeBSD/Linux Kernel Cross Reference
sys/sys/_lock.h
1 /*-
2 * Copyright (c) 1997 Berkeley Software Design, Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 * 3. Berkeley Software Design Inc's name may not be used to endorse or
13 * promote products derived from this software without specific prior
14 * written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY BERKELEY SOFTWARE DESIGN INC ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL BERKELEY SOFTWARE DESIGN INC BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 *
28 * $FreeBSD$
29 */
30
31 #ifndef _SYS__LOCK_H_
32 #define _SYS__LOCK_H_
33
34 struct lock_profile_object {
35 /*
36 * This does not result in variant structure sizes because
37 * MUTEX_PROFILING is in opt_global.h
38 */
39 u_int64_t lpo_acqtime;
40 u_int64_t lpo_waittime;
41 const char *lpo_filename;
42 u_int lpo_namehash;
43 int lpo_lineno;
44 const char *lpo_type;
45 /*
46 * Fields relating to measuring contention on mutexes.
47 * holding must be accessed atomically since it's
48 * modified by threads that don't yet hold the mutex.
49 * locking is only modified and referenced while
50 * the mutex is held.
51 */
52 u_int lpo_contest_holding;
53 u_int lpo_contest_locking;
54 };
55
56 struct lock_object {
57 const char *lo_name; /* Individual lock name. */
58 const char *lo_type; /* General lock type. */
59 u_int lo_flags;
60 #ifdef LOCK_PROFILING
61 struct lock_profile_object lo_profile_obj;
62 #endif
63 union { /* Data for witness. */
64 STAILQ_ENTRY(lock_object) lod_list;
65 struct witness *lod_witness;
66 } lo_witness_data;
67 };
68
69 #endif /* !_SYS__LOCK_H_ */
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