callout.h revision 127976
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 * 4. 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: head/sys/sys/callout.h 127976 2004-04-07 04:19:52Z imp $ 36 */ 37 38#ifndef _SYS_CALLOUT_H_ 39#define _SYS_CALLOUT_H_ 40 41#include <sys/queue.h> 42 43SLIST_HEAD(callout_list, callout); 44TAILQ_HEAD(callout_tailq, callout); 45 46struct callout { 47 union { 48 SLIST_ENTRY(callout) sle; 49 TAILQ_ENTRY(callout) tqe; 50 } c_links; 51 int c_time; /* ticks to the event */ 52 void *c_arg; /* function argument */ 53 void (*c_func)(void *); /* function to call */ 54 int c_flags; /* state of this entry */ 55}; 56 57#define CALLOUT_LOCAL_ALLOC 0x0001 /* was allocated from callfree */ 58#define CALLOUT_ACTIVE 0x0002 /* callout is currently active */ 59#define CALLOUT_PENDING 0x0004 /* callout is waiting for timeout */ 60#define CALLOUT_MPSAFE 0x0008 /* callout handler is mp safe */ 61 62struct callout_handle { 63 struct callout *callout; 64}; 65 66#ifdef _KERNEL 67extern struct callout_list callfree; 68extern struct callout *callout; 69extern int ncallout; 70extern struct callout_tailq *callwheel; 71extern int callwheelsize, callwheelbits, callwheelmask, softticks; 72extern struct mtx callout_lock; 73 74#define callout_active(c) ((c)->c_flags & CALLOUT_ACTIVE) 75#define callout_deactivate(c) ((c)->c_flags &= ~CALLOUT_ACTIVE) 76void callout_init(struct callout *, int); 77#define callout_pending(c) ((c)->c_flags & CALLOUT_PENDING) 78void callout_reset(struct callout *, int, void (*)(void *), void *); 79int callout_stop(struct callout *); 80#define callout_stop(c) _callout_stop_safe(c, 0) 81#define callout_drain(c) _callout_stop_safe(c, 1) 82int _callout_stop_safe(struct callout *, int); 83 84#endif 85 86#endif /* _SYS_CALLOUT_H_ */ 87