FreeBSD/Linux Kernel Cross Reference
sys/sys/callout.h
1 /*-
2 * Copyright (c) 1990, 1993
3 * The Regents of the University of California. All rights reserved.
4 * (c) UNIX System Laboratories, Inc.
5 * All or some portions of this file are derived from material licensed
6 * to the University of California by American Telephone and Telegraph
7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
8 * the permission of UNIX System Laboratories, Inc.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 4. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 * @(#)callout.h 8.2 (Berkeley) 1/21/94
35 * $FreeBSD: src/sys/sys/callout.h,v 1.27 2004/04/20 15:49:31 cperciva Exp $
36 */
37
38 #ifndef _SYS_CALLOUT_H_
39 #define _SYS_CALLOUT_H_
40
41 #include <sys/queue.h>
42
43 SLIST_HEAD(callout_list, callout);
44 TAILQ_HEAD(callout_tailq, callout);
45
46 struct callout {
47 union {
48 SLIST_ENTRY(callout) sle;
49 TAILQ_ENTRY(callout) tqe;
50 } c_links;
51 int c_time; /* ticks to the event */
52 void *c_arg; /* function argument */
53 void (*c_func)(void *); /* function to call */
54 int c_flags; /* state of this entry */
55 };
56
57 #define CALLOUT_LOCAL_ALLOC 0x0001 /* was allocated from callfree */
58 #define CALLOUT_ACTIVE 0x0002 /* callout is currently active */
59 #define CALLOUT_PENDING 0x0004 /* callout is waiting for timeout */
60 #define CALLOUT_MPSAFE 0x0008 /* callout handler is mp safe */
61
62 struct callout_handle {
63 struct callout *callout;
64 };
65
66 #ifdef _KERNEL
67 extern struct callout_list callfree;
68 extern struct callout *callout;
69 extern int ncallout;
70 extern struct callout_tailq *callwheel;
71 extern int callwheelsize, callwheelbits, callwheelmask, softticks;
72 extern struct mtx callout_lock;
73
74 #define callout_active(c) ((c)->c_flags & CALLOUT_ACTIVE)
75 #define callout_deactivate(c) ((c)->c_flags &= ~CALLOUT_ACTIVE)
76 #define callout_drain(c) _callout_stop_safe(c, 1)
77 void callout_init(struct callout *, int);
78 #define callout_pending(c) ((c)->c_flags & CALLOUT_PENDING)
79 void callout_reset(struct callout *, int, void (*)(void *), void *);
80 #define callout_stop(c) _callout_stop_safe(c, 0)
81 int _callout_stop_safe(struct callout *, int);
82
83 #endif
84
85 #endif /* _SYS_CALLOUT_H_ */
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