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: src/sys/sys/callout.h,v 1.15.2.1 2001/11/13 18:24:52 archie Exp $
   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         struct globaldata *c_gd;
   60 };
   61 
   62 #define CALLOUT_LOCAL_ALLOC     0x0001 /* was allocated from callfree */
   63 #define CALLOUT_ACTIVE          0x0002 /* callout is currently active */
   64 #define CALLOUT_PENDING         0x0004 /* callout is waiting for timeout */
   65 #define CALLOUT_MPSAFE          0x0008 /* callout does not need the BGL */
   66 #define CALLOUT_DID_INIT        0x0010 /* safety check */
   67 #define CALLOUT_RUNNING         0x0020 /* function execution in progress */
   68 
   69 struct callout_handle {
   70         struct callout *callout;
   71 };
   72 
   73 /*
   74  * WARNING!  These macros may only be used when the state of the callout
   75  * structure is stable, meaning from within the callback function or after
   76  * the callback function has been called but the timer has not yet been reset.
   77  */
   78 #define callout_active(c)       ((c)->c_flags & CALLOUT_ACTIVE)
   79 #define callout_deactivate(c)   ((c)->c_flags &= ~CALLOUT_ACTIVE)
   80 #define callout_pending(c)      ((c)->c_flags & CALLOUT_PENDING)
   81 
   82 #ifdef _KERNEL
   83 extern int      ncallout;
   84 
   85 struct globaldata;
   86 
   87 void    hardclock_softtick(struct globaldata *);
   88 void    callout_init (struct callout *);
   89 void    callout_init_mp (struct callout *);
   90 void    callout_reset (struct callout *, int, void (*)(void *), void *);
   91 int     callout_stop (struct callout *);
   92 void    callout_stop_sync (struct callout *);
   93 void    callout_terminate (struct callout *);
   94 void    callout_reset_bycpu (struct callout *, int, void (*)(void *), void *,
   95             int);
   96 
   97 #define callout_drain(x) callout_stop_sync(x)
   98 
   99 #endif
  100 
  101 #endif /* _SYS_CALLOUT_H_ */

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