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.
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
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.
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
34 * @(#)callout.h 8.2 (Berkeley) 1/21/94
38 #ifndef _SYS_CALLOUT_H_
39 #define _SYS_CALLOUT_H_
41 #include <sys/queue.h>
45 SLIST_HEAD(callout_list, callout);
46 TAILQ_HEAD(callout_tailq, callout);
50 SLIST_ENTRY(callout) sle;
51 TAILQ_ENTRY(callout) tqe;
53 int c_time; /* ticks to the event */
54 void *c_arg; /* function argument */
55 void (*c_func)(void *); /* function to call */
56 struct mtx *c_mtx; /* mutex to lock */
57 int c_flags; /* state of this entry */
60 #define CALLOUT_LOCAL_ALLOC 0x0001 /* was allocated from callfree */
61 #define CALLOUT_ACTIVE 0x0002 /* callout is currently active */
62 #define CALLOUT_PENDING 0x0004 /* callout is waiting for timeout */
63 #define CALLOUT_MPSAFE 0x0008 /* callout handler is mp safe */
64 #define CALLOUT_RETURNUNLOCKED 0x0010 /* handler returns with mtx unlocked */
66 struct callout_handle {
67 struct callout *callout;
71 extern struct callout_list callfree;
72 extern struct callout *callout;
74 extern struct callout_tailq *callwheel;
75 extern int callwheelsize, callwheelbits, callwheelmask, softticks;
76 extern struct mtx callout_lock;
78 #define callout_active(c) ((c)->c_flags & CALLOUT_ACTIVE)
79 #define callout_deactivate(c) ((c)->c_flags &= ~CALLOUT_ACTIVE)
80 #define callout_drain(c) _callout_stop_safe(c, 1)
81 void callout_init(struct callout *, int);
82 void callout_init_mtx(struct callout *, struct mtx *, int);
83 #define callout_pending(c) ((c)->c_flags & CALLOUT_PENDING)
84 int callout_reset(struct callout *, int, void (*)(void *), void *);
85 #define callout_stop(c) _callout_stop_safe(c, 0)
86 int _callout_stop_safe(struct callout *, int);
90 #endif /* _SYS_CALLOUT_H_ */