sys/sys/callout.h

   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. All advertising materials mentioning features or use of this software
  19  *    must display the following acknowledgement:
  20  *      This product includes software developed by the University of
  21  *      California, Berkeley and its contributors.
  22  * 4. Neither the name of the University nor the names of its contributors
  23  *    may be used to endorse or promote products derived from this software
  24  *    without specific prior written permission.
  25  *
  26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  36  * SUCH DAMAGE.
  37  *
  38  *      @(#)callout.h   8.2 (Berkeley) 1/21/94
  39  * $FreeBSD: src/sys/sys/callout.h,v 1.15.2.1 2001/11/13 18:24:52 archie Exp $
  40  * $DragonFly: src/sys/sys/callout.h,v 1.5 2004/09/17 09:34:54 dillon Exp $
  41  */
  42
  43 #ifndef _SYS_CALLOUT_H_
  44 #define _SYS_CALLOUT_H_
  45
  46 #include <sys/queue.h>
  47
  48 SLIST_HEAD(callout_list, callout);
  49 TAILQ_HEAD(callout_tailq, callout);
  50
  51 struct callout {
  52         union {
  53                 SLIST_ENTRY(callout) sle;
  54                 TAILQ_ENTRY(callout) tqe;
  55         } c_links;
  56         int     c_time;                 /* ticks to the event */
  57         void    *c_arg;                 /* function argument */
  58         void    (*c_func) (void *);     /* function to call */
  59         int     c_flags;                /* state of this entry */
  60 #ifdef SMP
  61         struct globaldata *c_gd;
  62 #else
  63         void    *c_gd_reserved;
  64 #endif
  65 };
  66
  67 #define CALLOUT_LOCAL_ALLOC     0x0001 /* was allocated from callfree */
  68 #define CALLOUT_ACTIVE          0x0002 /* callout is currently active */
  69 #define CALLOUT_PENDING         0x0004 /* callout is waiting for timeout */
  70 #define CALLOUT_MPSAFE          0x0008 /* callout does not need the BGL */
  71 #define CALLOUT_DID_INIT        0x0010 /* safety check */
  72
  73 struct callout_handle {
  74         struct callout *callout;
  75 };
  76
  77 /*
  78  * WARNING!  These macros may only be used when the state of the callout
  79  * structure is stable, meaning from within the callback function or after
  80  * the callback function has been called but the timer has not yet been reset.
  81  */
  82 #define callout_active(c)       ((c)->c_flags & CALLOUT_ACTIVE)
  83 #define callout_deactivate(c)   ((c)->c_flags &= ~CALLOUT_ACTIVE)
  84 #define callout_pending(c)      ((c)->c_flags & CALLOUT_PENDING)
  85
  86 #ifdef _KERNEL
  87 extern int      ncallout;
  88
  89 struct globaldata;
  90
  91 void    hardclock_softtick(struct globaldata *);
  92 void    callout_init (struct callout *);
  93 void    callout_init_mp (struct callout *);
  94 void    callout_reset (struct callout *, int, void (*)(void *), void *);
  95 int     callout_stop (struct callout *);
  96
  97 #endif
  98
  99 #endif /* _SYS_CALLOUT_H_ */