The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/sys/callout.h

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    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: releng/5.1/sys/sys/callout.h 92719 2002-03-19 20:18:42Z alfred $
   40  */
   41 
   42 #ifndef _SYS_CALLOUT_H_
   43 #define _SYS_CALLOUT_H_
   44 
   45 #include <sys/queue.h>
   46 
   47 SLIST_HEAD(callout_list, callout);
   48 TAILQ_HEAD(callout_tailq, callout);
   49 
   50 struct callout {
   51         union {
   52                 SLIST_ENTRY(callout) sle;
   53                 TAILQ_ENTRY(callout) tqe;
   54         } c_links;
   55         int     c_time;                         /* ticks to the event */
   56         void    *c_arg;                         /* function argument */
   57         void    (*c_func)(void *);      /* function to call */
   58         int     c_flags;                        /* state of this entry */
   59 };
   60 
   61 #define CALLOUT_LOCAL_ALLOC     0x0001 /* was allocated from callfree */
   62 #define CALLOUT_ACTIVE          0x0002 /* callout is currently active */
   63 #define CALLOUT_PENDING         0x0004 /* callout is waiting for timeout */
   64 #define CALLOUT_MPSAFE          0x0008 /* callout handler is mp safe */
   65 
   66 struct callout_handle {
   67         struct callout *callout;
   68 };
   69 
   70 #ifdef _KERNEL
   71 extern struct callout_list callfree;
   72 extern struct callout *callout;
   73 extern int ncallout;
   74 extern struct callout_tailq *callwheel;
   75 extern int callwheelsize, callwheelbits, callwheelmask, softticks;
   76 extern struct mtx callout_lock;
   77 
   78 #define callout_active(c)       ((c)->c_flags & CALLOUT_ACTIVE)
   79 #define callout_deactivate(c)   ((c)->c_flags &= ~CALLOUT_ACTIVE)
   80 void    callout_init(struct callout *, int);
   81 #define callout_pending(c)      ((c)->c_flags & CALLOUT_PENDING)
   82 void    callout_reset(struct callout *, int, void (*)(void *), void *);
   83 int     callout_stop(struct callout *);
   84 
   85 #endif
   86 
   87 #endif /* _SYS_CALLOUT_H_ */

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