timer.h revision 1.15
1 1.15 riastrad /* $NetBSD: timer.h,v 1.15 2021/12/19 12:01:57 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 1.2 riastrad #ifndef _LINUX_TIMER_H_ 33 1.2 riastrad #define _LINUX_TIMER_H_ 34 1.2 riastrad 35 1.2 riastrad #include <sys/callout.h> 36 1.2 riastrad 37 1.2 riastrad #include <linux/jiffies.h> 38 1.10 riastrad #include <linux/ktime.h> 39 1.2 riastrad 40 1.2 riastrad struct timer_list { 41 1.2 riastrad struct callout tl_callout; 42 1.2 riastrad }; 43 1.2 riastrad 44 1.8 riastrad #define from_timer(V, T, F) container_of(T, __typeof__(*(V)), F) 45 1.8 riastrad 46 1.11 riastrad #define TIMER_IRQSAFE __BIT(0) 47 1.11 riastrad 48 1.2 riastrad static inline void 49 1.8 riastrad timer_setup(struct timer_list *timer, void (*fn)(struct timer_list *), 50 1.12 riastrad int flags) 51 1.2 riastrad { 52 1.2 riastrad 53 1.2 riastrad callout_init(&timer->tl_callout, 0); 54 1.2 riastrad 55 1.2 riastrad /* XXX Super-sketchy casts! */ 56 1.7 christos callout_setfunc(&timer->tl_callout, (void (*)(void *))(void *)fn, 57 1.12 riastrad (void *)timer); 58 1.2 riastrad } 59 1.2 riastrad 60 1.13 riastrad static inline int 61 1.2 riastrad mod_timer(struct timer_list *timer, unsigned long then) 62 1.2 riastrad { 63 1.2 riastrad const unsigned long now = jiffies; 64 1.13 riastrad int pending; 65 1.2 riastrad 66 1.13 riastrad pending = callout_pending(&timer->tl_callout); 67 1.2 riastrad callout_schedule(&timer->tl_callout, (now < then? (then - now) : 0)); 68 1.13 riastrad return pending; 69 1.2 riastrad } 70 1.2 riastrad 71 1.2 riastrad static inline void 72 1.4 riastrad mod_timer_pinned(struct timer_list *timer, unsigned long then) 73 1.4 riastrad { 74 1.4 riastrad 75 1.4 riastrad /* XXX Stay on the same CPU it was originally on... */ 76 1.4 riastrad mod_timer(timer, then); 77 1.4 riastrad } 78 1.4 riastrad 79 1.4 riastrad static inline void 80 1.5 riastrad del_timer(struct timer_list *timer) 81 1.5 riastrad { 82 1.5 riastrad 83 1.5 riastrad callout_stop(&timer->tl_callout); 84 1.5 riastrad } 85 1.5 riastrad 86 1.15 riastrad static inline int 87 1.2 riastrad del_timer_sync(struct timer_list *timer) 88 1.2 riastrad { 89 1.3 riastrad 90 1.15 riastrad /* 91 1.15 riastrad * Linux: `The function returns whether it has deactivated a 92 1.15 riastrad * pending timer or not.' 93 1.15 riastrad * 94 1.15 riastrad * NetBSD: `[callout_halt] will return a non-zero value if the 95 1.15 riastrad * callout was EXPIRED.', meaning it is no longer pending. 96 1.15 riastrad */ 97 1.15 riastrad return !callout_halt(&timer->tl_callout, NULL); 98 1.2 riastrad } 99 1.2 riastrad 100 1.5 riastrad static inline bool 101 1.5 riastrad timer_pending(struct timer_list *timer) 102 1.5 riastrad { 103 1.5 riastrad 104 1.5 riastrad return callout_pending(&timer->tl_callout); 105 1.5 riastrad } 106 1.5 riastrad 107 1.2 riastrad /* 108 1.2 riastrad * XXX This is bogus -- the Linux version does various machinations to 109 1.2 riastrad * give some jitter so that stuff doesn't wake up all at once. 110 1.2 riastrad */ 111 1.2 riastrad 112 1.2 riastrad static inline unsigned long 113 1.2 riastrad round_jiffies_up(unsigned long j) 114 1.2 riastrad { 115 1.2 riastrad return roundup(j, hz); 116 1.2 riastrad } 117 1.2 riastrad 118 1.2 riastrad static inline unsigned long 119 1.2 riastrad round_jiffies_up_relative(unsigned long j) 120 1.2 riastrad { 121 1.2 riastrad return roundup(j, hz); 122 1.2 riastrad } 123 1.2 riastrad 124 1.2 riastrad #endif /* _LINUX_TIMER_H_ */ 125
Indexes created Sun Sep 21 16:09:51 GMT 2025