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  * 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: releng/8.4/sys/sys/callout.h 235223 2012-05-10 10:56:46Z kib $
   36  */
   37 
   38 #ifndef _SYS_CALLOUT_H_
   39 #define _SYS_CALLOUT_H_
   40 
   41 #include <sys/queue.h>
   42 
   43 struct lock_object;
   44 
   45 SLIST_HEAD(callout_list, callout);
   46 TAILQ_HEAD(callout_tailq, callout);
   47 
   48 struct callout {
   49         union {
   50                 SLIST_ENTRY(callout) sle;
   51                 TAILQ_ENTRY(callout) tqe;
   52         } c_links;
   53         int     c_time;                         /* ticks to the event */
   54         void    *c_arg;                         /* function argument */
   55         void    (*c_func)(void *);              /* function to call */
   56         struct lock_object *c_lock;             /* lock to handle */
   57         int     c_flags;                        /* state of this entry */
   58         volatile int c_cpu;                     /* CPU we're scheduled on */
   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 #define CALLOUT_RETURNUNLOCKED  0x0010 /* handler returns with mtx unlocked */
   66 #define CALLOUT_SHAREDLOCK      0x0020 /* callout lock held in shared mode */
   67 #define CALLOUT_DFRMIGRATION    0x0040 /* callout in deferred migration mode */
   68 
   69 struct callout_handle {
   70         struct callout *callout;
   71 };
   72 
   73 #ifdef _KERNEL
   74 extern int ncallout;
   75 
   76 #define callout_active(c)       ((c)->c_flags & CALLOUT_ACTIVE)
   77 #define callout_deactivate(c)   ((c)->c_flags &= ~CALLOUT_ACTIVE)
   78 #define callout_drain(c)        _callout_stop_safe(c, 1)
   79 void    callout_init(struct callout *, int);
   80 void    _callout_init_lock(struct callout *, struct lock_object *, int);
   81 #define callout_init_mtx(c, mtx, flags)                                 \
   82         _callout_init_lock((c), ((mtx) != NULL) ? &(mtx)->lock_object : \
   83             NULL, (flags))
   84 #define callout_init_rw(c, rw, flags)                                   \
   85         _callout_init_lock((c), ((rw) != NULL) ? &(rw)->lock_object :   \
   86            NULL, (flags))
   87 #define callout_pending(c)      ((c)->c_flags & CALLOUT_PENDING)
   88 int     callout_reset_on(struct callout *, int, void (*)(void *), void *, int);
   89 #define callout_reset(c, on_tick, fn, arg)                              \
   90     callout_reset_on((c), (on_tick), (fn), (arg), (c)->c_cpu)
   91 #define callout_reset_curcpu(c, on_tick, fn, arg)                       \
   92     callout_reset_on((c), (on_tick), (fn), (arg), PCPU_GET(cpuid))
   93 int     callout_schedule(struct callout *, int);
   94 int     callout_schedule_on(struct callout *, int, int);
   95 #define callout_schedule_curcpu(c, on_tick)                             \
   96     callout_schedule_on((c), (on_tick), PCPU_GET(cpuid))
   97 #define callout_stop(c)         _callout_stop_safe(c, 0)
   98 int     _callout_stop_safe(struct callout *, int);
   99 void    callout_tick(void);
  100 
  101 
  102 #endif
  103 
  104 #endif /* _SYS_CALLOUT_H_ */

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