1 /*- 2 * Copyright (c) 1990, 1993 3 * The Regents of the University of California. All rights reserved. 4 * (c) UNIX System Laboratories, Inc. 5 * All or some portions of this file are derived from material licensed 6 * to the University of California by American Telephone and Telegraph 7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 8 * the permission of UNIX System Laboratories, Inc. 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 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)callout.h 8.2 (Berkeley) 1/21/94 35 * $FreeBSD$ 36 */ 37 38 #ifndef _SYS_CALLOUT_H_ 39 #define _SYS_CALLOUT_H_ 40 41 #include <sys/_callout.h> 42 43 #define CALLOUT_LOCAL_ALLOC 0x0001 /* was allocated from callfree */ 44 #define CALLOUT_ACTIVE 0x0002 /* callout is currently active */ 45 #define CALLOUT_PENDING 0x0004 /* callout is waiting for timeout */ 46 #define CALLOUT_MPSAFE 0x0008 /* deprecated */ 47 #define CALLOUT_RETURNUNLOCKED 0x0010 /* handler returns with mtx unlocked */ 48 #define CALLOUT_SHAREDLOCK 0x0020 /* callout lock held in shared mode */ 49 #define CALLOUT_DFRMIGRATION 0x0040 /* callout in deferred migration mode */ 50 #define CALLOUT_PROCESSED 0x0080 /* callout in wheel or processing list? */ 51 #define CALLOUT_DIRECT 0x0100 /* allow exec from hw int context */ 52 53 #define C_DIRECT_EXEC 0x0001 /* direct execution of callout */ 54 #define C_PRELBITS 7 55 #define C_PRELRANGE ((1 << C_PRELBITS) - 1) 56 #define C_PREL(x) (((x) + 1) << 1) 57 #define C_PRELGET(x) (int)((((x) >> 1) & C_PRELRANGE) - 1) 58 #define C_HARDCLOCK 0x0100 /* align to hardclock() calls */ 59 #define C_ABSOLUTE 0x0200 /* event time is absolute. */ 60 #define C_PRECALC 0x0400 /* event time is pre-calculated. */ 61 62 struct callout_handle { 63 struct callout *callout; 64 }; 65 66 /* Flags for callout_stop_safe() */ 67 #define CS_DRAIN 0x0001 /* callout_drain(), wait allowed */ 68 #define CS_EXECUTING 0x0002 /* Positive return value indicates that 69 the callout was executing */ 70 71 #ifdef _KERNEL 72 /* 73 * Note the flags field is actually *two* fields. The c_flags 74 * field is the one that caller operations that may, or may not have 75 * a lock touches i.e. callout_deactivate(). The other, the c_iflags, 76 * is the internal flags that *must* be kept correct on which the 77 * callout system depend on e.g. callout_pending(). 78 * The c_iflag is used internally by the callout system to determine which 79 * list the callout is on and track internal state. Callers *should not* 80 * use the c_flags field directly but should use the macros provided. 81 * 82 * The c_iflags field holds internal flags that are protected by internal 83 * locks of the callout subsystem. The c_flags field holds external flags. 84 * The caller must hold its own lock while manipulating or reading external 85 * flags via callout_active(), callout_deactivate(), callout_reset*(), or 86 * callout_stop() to avoid races. 87 */ 88 #define callout_active(c) ((c)->c_flags & CALLOUT_ACTIVE) 89 #define callout_deactivate(c) ((c)->c_flags &= ~CALLOUT_ACTIVE) 90 #define callout_drain(c) _callout_stop_safe(c, CS_DRAIN, NULL) 91 void callout_init(struct callout *, int); 92 void _callout_init_lock(struct callout *, struct lock_object *, int); 93 #define callout_init_mtx(c, mtx, flags) \ 94 _callout_init_lock((c), ((mtx) != NULL) ? &(mtx)->lock_object : \ 95 NULL, (flags)) 96 #define callout_init_rm(c, rm, flags) \ 97 _callout_init_lock((c), ((rm) != NULL) ? &(rm)->lock_object : \ 98 NULL, (flags)) 99 #define callout_init_rw(c, rw, flags) \ 100 _callout_init_lock((c), ((rw) != NULL) ? &(rw)->lock_object : \ 101 NULL, (flags)) 102 #define callout_pending(c) ((c)->c_iflags & CALLOUT_PENDING) 103 int callout_reset_sbt_on(struct callout *, sbintime_t, sbintime_t, 104 void (*)(void *), void *, int, int); 105 #define callout_reset_sbt(c, sbt, pr, fn, arg, flags) \ 106 callout_reset_sbt_on((c), (sbt), (pr), (fn), (arg), -1, (flags)) 107 #define callout_reset_sbt_curcpu(c, sbt, pr, fn, arg, flags) \ 108 callout_reset_sbt_on((c), (sbt), (pr), (fn), (arg), PCPU_GET(cpuid),\ 109 (flags)) 110 #define callout_reset_on(c, to_ticks, fn, arg, cpu) \ 111 callout_reset_sbt_on((c), tick_sbt * (to_ticks), 0, (fn), (arg), \ 112 (cpu), C_HARDCLOCK) 113 #define callout_reset(c, on_tick, fn, arg) \ 114 callout_reset_on((c), (on_tick), (fn), (arg), -1) 115 #define callout_reset_curcpu(c, on_tick, fn, arg) \ 116 callout_reset_on((c), (on_tick), (fn), (arg), PCPU_GET(cpuid)) 117 #define callout_schedule_sbt_on(c, sbt, pr, cpu, flags) \ 118 callout_reset_sbt_on((c), (sbt), (pr), (c)->c_func, (c)->c_arg, \ 119 (cpu), (flags)) 120 #define callout_schedule_sbt(c, sbt, pr, flags) \ 121 callout_schedule_sbt_on((c), (sbt), (pr), -1, (flags)) 122 #define callout_schedule_sbt_curcpu(c, sbt, pr, flags) \ 123 callout_schedule_sbt_on((c), (sbt), (pr), PCPU_GET(cpuid), (flags)) 124 int callout_schedule(struct callout *, int); 125 int callout_schedule_on(struct callout *, int, int); 126 #define callout_schedule_curcpu(c, on_tick) \ 127 callout_schedule_on((c), (on_tick), PCPU_GET(cpuid)) 128 #define callout_stop(c) _callout_stop_safe(c, 0, NULL) 129 int _callout_stop_safe(struct callout *, int, void (*)(void *)); 130 void callout_process(sbintime_t now); 131 #define callout_async_drain(c, d) \ 132 _callout_stop_safe(c, 0, d) 133 void callout_when(sbintime_t sbt, sbintime_t precision, int flags, 134 sbintime_t *sbt_res, sbintime_t *prec_res); 135 #endif 136 137 #endif /* _SYS_CALLOUT_H_ */ 138