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/* $NetBSD: callout.h,v 1.32 2015/02/07 19:36:42 christos Exp $ */
/*-
* Copyright (c) 2000, 2003, 2006, 2007, 2008 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
* NASA Ames Research Center, and by Andrew Doran.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _SYS_CALLOUT_H_
#define _SYS_CALLOUT_H_
#include <sys/types.h>
/*
* The callout implementation is private to kern_timeout.c yet uses
* caller-supplied storage, as lightweight callout operations are
* critical to system performance.
*
* The size of callout_t must remain constant in order to ensure ABI
* compatibility for kernel modules: it may become smaller, but must
* not grow. If more space is required, rearrange the members of
* callout_impl_t.
*/
typedef struct callout {
void *_c_store[10];
} callout_t;
/* Internal flags. */
#define CALLOUT_BOUND 0x0001 /* bound to a specific CPU */
#define CALLOUT_PENDING 0x0002 /* callout is on the queue */
#define CALLOUT_FIRED 0x0004 /* callout has fired */
#define CALLOUT_INVOKING 0x0008 /* callout function is being invoked */
/* End-user flags. */
#define CALLOUT_MPSAFE 0x0100 /* does not need kernel_lock */
#define CALLOUT_FLAGMASK 0xff00
#define CALLOUT_FMT "\177\020\
b\00BOUND\0\
b\01PENDING\0\
b\02FIRED\0\
b\03INVOKING\0\
b\10MPSAFE\0"
#ifdef _CALLOUT_PRIVATE
/* The following funkyness is to appease gcc3's strict aliasing. */
struct callout_circq {
/* next element */
union {
struct callout_impl *elem;
struct callout_circq *list;
} cq_next;
/* previous element */
union {
struct callout_impl *elem;
struct callout_circq *list;
} cq_prev;
};
#define cq_next_e cq_next.elem
#define cq_prev_e cq_prev.elem
#define cq_next_l cq_next.list
#define cq_prev_l cq_prev.list
struct callout_cpu;
typedef struct callout_impl {
struct callout_circq c_list; /* linkage on queue */
void (*c_func)(void *); /* function to call */
void *c_arg; /* function argument */
struct callout_cpu * volatile c_cpu; /* associated CPU */
int c_time; /* when callout fires */
u_int c_flags; /* state of this entry */
u_int c_magic; /* magic number */
} callout_impl_t;
#define CALLOUT_MAGIC 0x11deeba1
#endif /* _CALLOUT_PRIVATE */
#ifdef _KERNEL
struct cpu_info;
void callout_startup(void);
void callout_init_cpu(struct cpu_info *);
void callout_hardclock(void);
void callout_init(callout_t *, u_int);
void callout_destroy(callout_t *);
void callout_setfunc(callout_t *, void (*)(void *), void *);
void callout_reset(callout_t *, int, void (*)(void *), void *);
void callout_schedule(callout_t *, int);
bool callout_stop(callout_t *);
bool callout_halt(callout_t *, void *);
bool callout_pending(callout_t *);
bool callout_expired(callout_t *);
bool callout_active(callout_t *);
bool callout_invoking(callout_t *);
void callout_ack(callout_t *);
void callout_bind(callout_t *, struct cpu_info *);
#endif /* _KERNEL */
#endif /* !_SYS_CALLOUT_H_ */
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