1 /* $NetBSD: timer.h,v 1.2 2014/03/18 18:20:43 riastradh Exp $ */ 2 3 /*- 4 * Copyright (c) 2013 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Taylor R. Campbell. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 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 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #ifndef _LINUX_TIMER_H_ 33 #define _LINUX_TIMER_H_ 34 35 #include <sys/callout.h> 36 37 #include <linux/jiffies.h> 38 39 struct timer_list { 40 struct callout tl_callout; 41 }; 42 43 static inline void 44 setup_timer(struct timer_list *timer, void (*fn)(unsigned long), 45 unsigned long arg) 46 { 47 48 callout_init(&timer->tl_callout, 0); 49 50 /* XXX Super-sketchy casts! */ 51 callout_setfunc(&timer->tl_callout, (void (*)(void *))fn, 52 (void *)(uintptr_t)arg); 53 } 54 55 static inline void 56 mod_timer(struct timer_list *timer, unsigned long then) 57 { 58 const unsigned long now = jiffies; 59 60 callout_schedule(&timer->tl_callout, (now < then? (then - now) : 0)); 61 } 62 63 static inline void 64 del_timer_sync(struct timer_list *timer) 65 { 66 callout_halt(&timer->tl_callout, NULL); 67 callout_destroy(&timer->tl_callout); 68 } 69 70 /* 71 * XXX This is bogus -- the Linux version does various machinations to 72 * give some jitter so that stuff doesn't wake up all at once. 73 */ 74 75 static inline unsigned long 76 round_jiffies_up(unsigned long j) 77 { 78 return roundup(j, hz); 79 } 80 81 static inline unsigned long 82 round_jiffies_up_relative(unsigned long j) 83 { 84 return roundup(j, hz); 85 } 86 87 #endif /* _LINUX_TIMER_H_ */ 88