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/* $NetBSD: callout.h,v 1.22 2005/12/11 12:25:20 christos Exp $ */
/*-
* Copyright (c) 2000, 2003 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
* NASA Ames Research Center.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Copyright (c) 2000-2001 Artur Grabowski <art@openbsd.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
* THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _SYS_CALLOUT_H_
#define _SYS_CALLOUT_H_
/*
* The following funkyness is to appease gcc3's strict aliasing.
*/
struct callout;
struct callout_circq {
/* next element */
union {
struct callout *elem;
struct callout_circq *list;
} cq_next;
/* previous element */
union {
struct callout *elem;
struct callout_circq *list;
} cq_prev;
};
#define cq_next_e cq_next.elem
#define cq_prev_e cq_prev.elem
#define cq_next_l cq_next.list
#define cq_prev_l cq_prev.list
struct callout {
struct callout_circq c_list; /* linkage on queue */
void (*c_func)(void *); /* function to call */
void *c_arg; /* function argument */
int c_time; /* when callout fires */
int c_flags; /* state of this entry */
};
#define CALLOUT_PENDING 0x0002 /* callout is on the queue */
#define CALLOUT_FIRED 0x0004 /* callout has fired */
#define CALLOUT_INVOKING 0x0008 /* callout function is being invoked */
#define CALLOUT_INITIALIZER_SETFUNC(func, arg) \
{ {{NULL}, {NULL}}, func, arg, 0, 0 }
#define CALLOUT_INITIALIZER CALLOUT_INITIALIZER_SETFUNC(NULL, NULL)
#ifdef _KERNEL
void callout_startup(void);
void callout_init(struct callout *);
void callout_setfunc(struct callout *, void (*)(void *), void *);
void callout_reset(struct callout *, int, void (*)(void *), void *);
void callout_schedule(struct callout *, int);
void callout_stop(struct callout *);
int callout_hardclock(void);
#define callout_setfunc(c, f, a) \
do { \
(c)->c_func = (f); \
(c)->c_arg = (a); \
} while (/*CONSTCOND*/0)
#define callout_pending(c) ((c)->c_flags & CALLOUT_PENDING)
#define callout_expired(c) ((c)->c_flags & CALLOUT_FIRED)
#define callout_active(c) ((c)->c_flags & (CALLOUT_PENDING|CALLOUT_FIRED))
#define callout_invoking(c) ((c)->c_flags & CALLOUT_INVOKING)
#define callout_ack(c) ((c)->c_flags &= ~CALLOUT_INVOKING)
#endif /* _KERNEL */
#endif /* !_SYS_CALLOUT_H_ */
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