| Vishal Bhoj | 82c8071 | 2015-12-15 21:13:33 +0530 | [diff] [blame^] | 1 | /* $NetBSD: callout.h,v 1.22 2005/12/11 12:25:20 christos Exp $ */
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| 2 |
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| 3 | /*-
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| 4 | * Copyright (c) 2000, 2003 The NetBSD Foundation, Inc.
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| 5 | * All rights reserved.
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| 6 | *
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| 7 | * This code is derived from software contributed to The NetBSD Foundation
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| 8 | * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
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| 9 | * NASA Ames Research Center.
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| 10 | *
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| 11 | * Redistribution and use in source and binary forms, with or without
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| 12 | * modification, are permitted provided that the following conditions
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| 13 | * are met:
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| 14 | * 1. Redistributions of source code must retain the above copyright
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| 15 | * notice, this list of conditions and the following disclaimer.
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| 16 | * 2. Redistributions in binary form must reproduce the above copyright
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| 17 | * notice, this list of conditions and the following disclaimer in the
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| 18 | * documentation and/or other materials provided with the distribution.
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| 19 | * 3. All advertising materials mentioning features or use of this software
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| 20 | * must display the following acknowledgement:
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| 21 | * This product includes software developed by the NetBSD
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| 22 | * Foundation, Inc. and its contributors.
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| 23 | * 4. Neither the name of The NetBSD Foundation nor the names of its
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| 24 | * contributors may be used to endorse or promote products derived
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| 25 | * from this software without specific prior written permission.
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| 26 | *
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| 27 | * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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| 28 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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| 29 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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| 30 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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| 31 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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| 32 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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| 33 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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| 34 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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| 35 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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| 36 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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| 37 | * POSSIBILITY OF SUCH DAMAGE.
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| 38 | */
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| 39 |
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| 40 | /*
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| 41 | * Copyright (c) 2000-2001 Artur Grabowski <art@openbsd.org>
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| 42 | * All rights reserved.
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| 43 | *
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| 44 | * Redistribution and use in source and binary forms, with or without
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| 45 | * modification, are permitted provided that the following conditions
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| 46 | * are met:
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| 47 | *
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| 48 | * 1. Redistributions of source code must retain the above copyright
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| 49 | * notice, this list of conditions and the following disclaimer.
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| 50 | * 2. Redistributions in binary form must reproduce the above copyright
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| 51 | * notice, this list of conditions and the following disclaimer in the
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| 52 | * documentation and/or other materials provided with the distribution.
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| 53 | * 3. The name of the author may not be used to endorse or promote products
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| 54 | * derived from this software without specific prior written permission.
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| 55 | *
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| 56 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
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| 57 | * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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| 58 | * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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| 59 | * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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| 60 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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| 61 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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| 62 | * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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| 63 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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| 64 | * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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| 65 | * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 66 | */
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| 67 |
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| 68 | #ifndef _SYS_CALLOUT_H_
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| 69 | #define _SYS_CALLOUT_H_
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| 70 |
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| 71 | /*
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| 72 | * The following funkyness is to appease gcc3's strict aliasing.
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| 73 | */
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| 74 | struct callout;
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| 75 | struct callout_circq {
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| 76 | /* next element */
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| 77 | union {
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| 78 | struct callout *elem;
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| 79 | struct callout_circq *list;
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| 80 | } cq_next;
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| 81 | /* previous element */
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| 82 | union {
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| 83 | struct callout *elem;
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| 84 | struct callout_circq *list;
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| 85 | } cq_prev;
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| 86 | };
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| 87 | #define cq_next_e cq_next.elem
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| 88 | #define cq_prev_e cq_prev.elem
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| 89 | #define cq_next_l cq_next.list
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| 90 | #define cq_prev_l cq_prev.list
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| 91 |
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| 92 | struct callout {
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| 93 | struct callout_circq c_list; /* linkage on queue */
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| 94 | void (*c_func)(void *); /* function to call */
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| 95 | void *c_arg; /* function argument */
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| 96 | int c_time; /* when callout fires */
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| 97 | int c_flags; /* state of this entry */
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| 98 | };
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| 99 |
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| 100 | #define CALLOUT_PENDING 0x0002 /* callout is on the queue */
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| 101 | #define CALLOUT_FIRED 0x0004 /* callout has fired */
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| 102 | #define CALLOUT_INVOKING 0x0008 /* callout function is being invoked */
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| 103 |
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| 104 | #define CALLOUT_INITIALIZER_SETFUNC(func, arg) \
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| 105 | { {{NULL}, {NULL}}, func, arg, 0, 0 }
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| 106 |
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| 107 | #define CALLOUT_INITIALIZER CALLOUT_INITIALIZER_SETFUNC(NULL, NULL)
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| 108 |
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| 109 | #ifdef _KERNEL
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| 110 | void callout_startup(void);
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| 111 | void callout_init(struct callout *);
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| 112 | void callout_setfunc(struct callout *, void (*)(void *), void *);
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| 113 | void callout_reset(struct callout *, int, void (*)(void *), void *);
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| 114 | void callout_schedule(struct callout *, int);
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| 115 | void callout_stop(struct callout *);
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| 116 | int callout_hardclock(void);
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| 117 |
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| 118 | #define callout_setfunc(c, f, a) \
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| 119 | do { \
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| 120 | (c)->c_func = (f); \
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| 121 | (c)->c_arg = (a); \
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| 122 | } while (/*CONSTCOND*/0)
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| 123 |
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| 124 | #define callout_pending(c) ((c)->c_flags & CALLOUT_PENDING)
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| 125 | #define callout_expired(c) ((c)->c_flags & CALLOUT_FIRED)
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| 126 | #define callout_active(c) ((c)->c_flags & (CALLOUT_PENDING|CALLOUT_FIRED))
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| 127 | #define callout_invoking(c) ((c)->c_flags & CALLOUT_INVOKING)
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| 128 | #define callout_ack(c) ((c)->c_flags &= ~CALLOUT_INVOKING)
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| 129 | #endif /* _KERNEL */
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| 130 |
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| 131 | #endif /* !_SYS_CALLOUT_H_ */
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