kernel: Make SMP support default (and non-optional).
[dragonfly.git] / sys / sys / callout.h
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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 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by the University of
21 * California, Berkeley and its contributors.
22 * 4. Neither the name of the University nor the names of its contributors
23 * may be used to endorse or promote products derived from this software
24 * without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * SUCH DAMAGE.
37 *
38 * @(#)callout.h 8.2 (Berkeley) 1/21/94
39 * $FreeBSD: src/sys/sys/callout.h,v 1.15.2.1 2001/11/13 18:24:52 archie Exp $
40 */
41
42#ifndef _SYS_CALLOUT_H_
43#define _SYS_CALLOUT_H_
44
45#include <sys/queue.h>
46
47SLIST_HEAD(callout_list, callout);
48TAILQ_HEAD(callout_tailq, callout);
49
50struct callout {
51 union {
52 SLIST_ENTRY(callout) sle;
53 TAILQ_ENTRY(callout) tqe;
54 } c_links;
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55 int c_time; /* ticks to the event */
56 void *c_arg; /* function argument */
b153f746 57 void (*c_func) (void *); /* function to call */
92b561b7 58 int c_flags; /* state of this entry */
92b561b7 59 struct globaldata *c_gd;
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60};
61
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62#define CALLOUT_LOCAL_ALLOC 0x0001 /* was allocated from callfree */
63#define CALLOUT_ACTIVE 0x0002 /* callout is currently active */
64#define CALLOUT_PENDING 0x0004 /* callout is waiting for timeout */
65#define CALLOUT_MPSAFE 0x0008 /* callout does not need the BGL */
36567e50 66#define CALLOUT_DID_INIT 0x0010 /* safety check */
4bdde820 67#define CALLOUT_RUNNING 0x0020 /* function execution in progress */
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68
69struct callout_handle {
70 struct callout *callout;
71};
72
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73/*
74 * WARNING! These macros may only be used when the state of the callout
75 * structure is stable, meaning from within the callback function or after
76 * the callback function has been called but the timer has not yet been reset.
77 */
78#define callout_active(c) ((c)->c_flags & CALLOUT_ACTIVE)
79#define callout_deactivate(c) ((c)->c_flags &= ~CALLOUT_ACTIVE)
80#define callout_pending(c) ((c)->c_flags & CALLOUT_PENDING)
81
984263bc 82#ifdef _KERNEL
984263bc 83extern int ncallout;
984263bc 84
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85struct globaldata;
86
87void hardclock_softtick(struct globaldata *);
b153f746 88void callout_init (struct callout *);
92b561b7 89void callout_init_mp (struct callout *);
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90void callout_reset (struct callout *, int, void (*)(void *), void *);
91int callout_stop (struct callout *);
c5b9d2a5 92void callout_stop_sync (struct callout *);
4bdde820 93void callout_terminate (struct callout *);
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94void callout_reset_bycpu (struct callout *, int, void (*)(void *), void *,
95 int);
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96
97#endif
98
99#endif /* _SYS_CALLOUT_H_ */