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/*-
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 * Copyright (c) 2005-2007, Kohsuke Ohtani
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 * 1. Redistributions of source code must retain the above copyright
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 *    notice, this list of conditions and the following disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright
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 *    notice, this list of conditions and the following disclaimer in the
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 *    documentation and/or other materials provided with the distribution.
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 * 3. Neither the name of the author nor the names of any co-contributors
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 *    may be used to endorse or promote products derived from this software
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 *    without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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 * SUCH DAMAGE.
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 */
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#ifndef _TIMER_H
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#define _TIMER_H
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#include <types.h>
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#include <sys/cdefs.h>
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#include <sys/list.h>
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#include <sys/sysinfo.h>
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#include <event.h>
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/*
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 * Time-out element.
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 */
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struct timer {
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        struct list        link;                /* linkage on timer chain */
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        int                state;                /* timer state */
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        u_long                expire;                /* expiration time, in ticks */
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        u_long                interval;        /* time interval */
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        void                (*func)(void *); /* function to call */
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        void                *arg;                /* function argument */
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        struct event        event;                /* event for this timer */
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};
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/* state for timer */
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#define TM_ACTIVE        0x54616321        /* magic# 'Tac!' */
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#define TM_STOP                0x54737421        /* magic# 'Tst!' */
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/*
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 * Macro to compare two timer counts.
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 * time_after() returns true if a is after b.
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 */
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#define time_after(a,b)                (((long)(b) - (long)(a)) < 0)
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#define time_before(a,b)        time_after(b,a)
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#define time_after_eq(a,b)        (((long)(a) - (long)(b)) >= 0)
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#define time_before_eq(a,b)        time_after_eq(b,a)
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/*
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 * Macro to get the next element on timer list.
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 */
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#define timer_next(head) \
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        (list_entry(list_first(head), struct timer, link))
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__BEGIN_DECLS
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void         timer_callout(struct timer *, u_long, void (*)(void *), void *);
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void         timer_stop(struct timer *);
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u_long         timer_delay(u_long);
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int         timer_sleep(u_long, u_long *);
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int         timer_alarm(u_long, u_long *);
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int         timer_periodic(thread_t, u_long, u_long);
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int         timer_waitperiod(void);
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void         timer_cancel(thread_t);
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void         timer_clock(void);
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void         timer_handler(void);
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u_long         timer_ticks(void);
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void         timer_info(struct timerinfo *);
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void         timer_init(void);
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__END_DECLS
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#endif /* !_TIMER_H */