2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1990, 1993
5 * The Regents of the University of California. All rights reserved.
6 * (c) UNIX System Laboratories, Inc.
7 * All or some portions of this file are derived from material licensed
8 * to the University of California by American Telephone and Telegraph
9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
10 * the permission of UNIX System Laboratories, Inc.
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13 * modification, are permitted provided that the following conditions
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36 * @(#)callout.h 8.2 (Berkeley) 1/21/94
40 #ifndef _SYS_CALLOUT_H_
41 #define _SYS_CALLOUT_H_
43 #include <sys/_callout.h>
45 #define CALLOUT_LOCAL_ALLOC 0x0001 /* was allocated from callfree */
46 #define CALLOUT_ACTIVE 0x0002 /* callout is currently active */
47 #define CALLOUT_PENDING 0x0004 /* callout is waiting for timeout */
48 #define CALLOUT_MPSAFE 0x0008 /* deprecated */
49 #define CALLOUT_RETURNUNLOCKED 0x0010 /* handler returns with mtx unlocked */
50 #define CALLOUT_SHAREDLOCK 0x0020 /* callout lock held in shared mode */
51 #define CALLOUT_DFRMIGRATION 0x0040 /* callout in deferred migration mode */
52 #define CALLOUT_PROCESSED 0x0080 /* callout in wheel or processing list? */
53 #define CALLOUT_DIRECT 0x0100 /* allow exec from hw int context */
55 #define C_DIRECT_EXEC 0x0001 /* direct execution of callout */
57 #define C_PRELRANGE ((1 << C_PRELBITS) - 1)
58 #define C_PREL(x) (((x) + 1) << 1)
59 #define C_PRELGET(x) (int)((((x) >> 1) & C_PRELRANGE) - 1)
60 #define C_HARDCLOCK 0x0100 /* align to hardclock() calls */
61 #define C_ABSOLUTE 0x0200 /* event time is absolute. */
62 #define C_PRECALC 0x0400 /* event time is pre-calculated. */
64 struct callout_handle {
65 struct callout *callout;
68 /* Flags for callout_stop_safe() */
69 #define CS_DRAIN 0x0001 /* callout_drain(), wait allowed */
70 #define CS_EXECUTING 0x0002 /* Positive return value indicates that
71 the callout was executing */
75 * Note the flags field is actually *two* fields. The c_flags
76 * field is the one that caller operations that may, or may not have
77 * a lock touches i.e. callout_deactivate(). The other, the c_iflags,
78 * is the internal flags that *must* be kept correct on which the
79 * callout system depend on e.g. callout_pending().
80 * The c_iflag is used internally by the callout system to determine which
81 * list the callout is on and track internal state. Callers *should not*
82 * use the c_flags field directly but should use the macros provided.
84 * The c_iflags field holds internal flags that are protected by internal
85 * locks of the callout subsystem. The c_flags field holds external flags.
86 * The caller must hold its own lock while manipulating or reading external
87 * flags via callout_active(), callout_deactivate(), callout_reset*(), or
88 * callout_stop() to avoid races.
90 #define callout_active(c) ((c)->c_flags & CALLOUT_ACTIVE)
91 #define callout_deactivate(c) ((c)->c_flags &= ~CALLOUT_ACTIVE)
92 #define callout_drain(c) _callout_stop_safe(c, CS_DRAIN, NULL)
93 void callout_init(struct callout *, int);
94 void _callout_init_lock(struct callout *, struct lock_object *, int);
95 #define callout_init_mtx(c, mtx, flags) \
96 _callout_init_lock((c), ((mtx) != NULL) ? &(mtx)->lock_object : \
98 #define callout_init_rm(c, rm, flags) \
99 _callout_init_lock((c), ((rm) != NULL) ? &(rm)->lock_object : \
101 #define callout_init_rw(c, rw, flags) \
102 _callout_init_lock((c), ((rw) != NULL) ? &(rw)->lock_object : \
104 #define callout_pending(c) ((c)->c_iflags & CALLOUT_PENDING)
105 int callout_reset_sbt_on(struct callout *, sbintime_t, sbintime_t,
106 void (*)(void *), void *, int, int);
107 #define callout_reset_sbt(c, sbt, pr, fn, arg, flags) \
108 callout_reset_sbt_on((c), (sbt), (pr), (fn), (arg), -1, (flags))
109 #define callout_reset_sbt_curcpu(c, sbt, pr, fn, arg, flags) \
110 callout_reset_sbt_on((c), (sbt), (pr), (fn), (arg), PCPU_GET(cpuid),\
112 #define callout_reset_on(c, to_ticks, fn, arg, cpu) \
113 callout_reset_sbt_on((c), tick_sbt * (to_ticks), 0, (fn), (arg), \
115 #define callout_reset(c, on_tick, fn, arg) \
116 callout_reset_on((c), (on_tick), (fn), (arg), -1)
117 #define callout_reset_curcpu(c, on_tick, fn, arg) \
118 callout_reset_on((c), (on_tick), (fn), (arg), PCPU_GET(cpuid))
119 #define callout_schedule_sbt_on(c, sbt, pr, cpu, flags) \
120 callout_reset_sbt_on((c), (sbt), (pr), (c)->c_func, (c)->c_arg, \
122 #define callout_schedule_sbt(c, sbt, pr, flags) \
123 callout_schedule_sbt_on((c), (sbt), (pr), -1, (flags))
124 #define callout_schedule_sbt_curcpu(c, sbt, pr, flags) \
125 callout_schedule_sbt_on((c), (sbt), (pr), PCPU_GET(cpuid), (flags))
126 int callout_schedule(struct callout *, int);
127 int callout_schedule_on(struct callout *, int, int);
128 #define callout_schedule_curcpu(c, on_tick) \
129 callout_schedule_on((c), (on_tick), PCPU_GET(cpuid))
130 #define callout_stop(c) _callout_stop_safe(c, 0, NULL)
131 int _callout_stop_safe(struct callout *, int, void (*)(void *));
132 void callout_process(sbintime_t now);
133 #define callout_async_drain(c, d) \
134 _callout_stop_safe(c, 0, d)
135 void callout_when(sbintime_t sbt, sbintime_t precision, int flags,
136 sbintime_t *sbt_res, sbintime_t *prec_res);
139 #endif /* _SYS_CALLOUT_H_ */