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timer.h revision 1.3 
      1  1.3  riastrad /*	$NetBSD: timer.h,v 1.3 2014/07/06 15:43:55 riastradh Exp $	*/
      2  1.2  riastrad 
      3  1.2  riastrad /*-
      4  1.2  riastrad  * Copyright (c) 2013 The NetBSD Foundation, Inc.
      5  1.2  riastrad  * All rights reserved.
      6  1.2  riastrad  *
      7  1.2  riastrad  * This code is derived from software contributed to The NetBSD Foundation
      8  1.2  riastrad  * by Taylor R. Campbell.
      9  1.2  riastrad  *
     10  1.2  riastrad  * Redistribution and use in source and binary forms, with or without
     11  1.2  riastrad  * modification, are permitted provided that the following conditions
     12  1.2  riastrad  * are met:
     13  1.2  riastrad  * 1. Redistributions of source code must retain the above copyright
     14  1.2  riastrad  *    notice, this list of conditions and the following disclaimer.
     15  1.2  riastrad  * 2. Redistributions in binary form must reproduce the above copyright
     16  1.2  riastrad  *    notice, this list of conditions and the following disclaimer in the
     17  1.2  riastrad  *    documentation and/or other materials provided with the distribution.
     18  1.2  riastrad  *
     19  1.2  riastrad  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  1.2  riastrad  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  1.2  riastrad  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  1.2  riastrad  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  1.2  riastrad  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  1.2  riastrad  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  1.2  riastrad  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  1.2  riastrad  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  1.2  riastrad  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  1.2  riastrad  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  1.2  riastrad  * POSSIBILITY OF SUCH DAMAGE.
     30  1.2  riastrad  */
     31  1.2  riastrad 
     32  1.3  riastrad /*
     33  1.3  riastrad  * Notes on porting:
     34  1.3  riastrad  *
     35  1.3  riastrad  * - Linux does not have teardown_timer.  You must add it yourself in
     36  1.3  riastrad  *   the appropriate place.
     37  1.3  riastrad  */
     38  1.3  riastrad 
     39  1.2  riastrad #ifndef _LINUX_TIMER_H_
     40  1.2  riastrad #define _LINUX_TIMER_H_
     41  1.2  riastrad 
     42  1.2  riastrad #include <sys/callout.h>
     43  1.2  riastrad 
     44  1.2  riastrad #include <linux/jiffies.h>
     45  1.2  riastrad 
     46  1.2  riastrad struct timer_list {
     47  1.2  riastrad 	struct callout tl_callout;
     48  1.2  riastrad };
     49  1.2  riastrad 
     50  1.2  riastrad static inline void
     51  1.2  riastrad setup_timer(struct timer_list *timer, void (*fn)(unsigned long),
     52  1.2  riastrad     unsigned long arg)
     53  1.2  riastrad {
     54  1.2  riastrad 
     55  1.2  riastrad 	callout_init(&timer->tl_callout, 0);
     56  1.2  riastrad 
     57  1.2  riastrad 	/* XXX Super-sketchy casts!  */
     58  1.2  riastrad 	callout_setfunc(&timer->tl_callout, (void (*)(void *))fn,
     59  1.2  riastrad 	    (void *)(uintptr_t)arg);
     60  1.2  riastrad }
     61  1.2  riastrad 
     62  1.2  riastrad static inline void
     63  1.3  riastrad teardown_timer(struct timer_list *timer)
     64  1.3  riastrad {
     65  1.3  riastrad 
     66  1.3  riastrad 	callout_destroy(&timer->tl_callout);
     67  1.3  riastrad }
     68  1.3  riastrad 
     69  1.3  riastrad static inline void
     70  1.2  riastrad mod_timer(struct timer_list *timer, unsigned long then)
     71  1.2  riastrad {
     72  1.2  riastrad 	const unsigned long now = jiffies;
     73  1.2  riastrad 
     74  1.2  riastrad 	callout_schedule(&timer->tl_callout, (now < then? (then - now) : 0));
     75  1.2  riastrad }
     76  1.2  riastrad 
     77  1.2  riastrad static inline void
     78  1.2  riastrad del_timer_sync(struct timer_list *timer)
     79  1.2  riastrad {
     80  1.3  riastrad 
     81  1.2  riastrad 	callout_halt(&timer->tl_callout, NULL);
     82  1.2  riastrad }
     83  1.2  riastrad 
     84  1.2  riastrad /*
     85  1.2  riastrad  * XXX This is bogus -- the Linux version does various machinations to
     86  1.2  riastrad  * give some jitter so that stuff doesn't wake up all at once.
     87  1.2  riastrad  */
     88  1.2  riastrad 
     89  1.2  riastrad static inline unsigned long
     90  1.2  riastrad round_jiffies_up(unsigned long j)
     91  1.2  riastrad {
     92  1.2  riastrad 	return roundup(j, hz);
     93  1.2  riastrad }
     94  1.2  riastrad 
     95  1.2  riastrad static inline unsigned long
     96  1.2  riastrad round_jiffies_up_relative(unsigned long j)
     97  1.2  riastrad {
     98  1.2  riastrad 	return roundup(j, hz);
     99  1.2  riastrad }
    100  1.2  riastrad 
    101  1.2  riastrad #endif  /* _LINUX_TIMER_H_ */
    102