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

     /*-
      * Copyright (c) 1990, 1993
      *      The Regents of the University of California.  All rights reserved.
      * (c) UNIX System Laboratories, Inc.
      * All or some portions of this file are derived from material licensed
      * to the University of California by American Telephone and Telegraph
      * Co. or Unix System Laboratories, Inc. and are reproduced herein with
      * the permission of UNIX System Laboratories, Inc.
      *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by the University of
     *      California, Berkeley and its contributors.
     * 4. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      @(#)callout.h   8.2 (Berkeley) 1/21/94
     * $FreeBSD$
     */
    
    #ifndef _SYS_CALLOUT_H_
    #define _SYS_CALLOUT_H_
    
    #include <sys/queue.h>
    
    SLIST_HEAD(callout_list, callout);
    TAILQ_HEAD(callout_tailq, callout);
    
    struct callout {
            union {
                    SLIST_ENTRY(callout) sle;
                    TAILQ_ENTRY(callout) tqe;
            } c_links;
            int     c_time;                         /* ticks to the event */
            void    *c_arg;                         /* function argument */
            void    (*c_func) __P((void *));        /* function to call */
            int     c_flags;                        /* state of this entry */
    };
    
    #define CALLOUT_LOCAL_ALLOC     0x0001 /* was allocated from callfree */
    #define CALLOUT_PENDING         0x0002 /* callout is currently active */
    #define CALLOUT_FIRED           0x0004 /* callout has been fired */
    
    struct callout_handle {
            struct callout *callout;
    };
    
    #ifdef KERNEL
    extern struct callout_list callfree;
    extern struct callout *callout;
    extern int      ncallout;
    extern struct callout_tailq *callwheel;
    extern int      callwheelsize, callwheelbits, callwheelmask, softticks;
    
    #define callout_fired(c)        ((c)->c_flags & CALLOUT_FIRED)
    void    callout_init __P((struct callout *));
    #define callout_pending(c)      (((c)->c_flags & CALLOUT_PENDING) ? \
                                     ((c)->c_time - ticks) : 0)
    void    callout_reset __P((struct callout *, int, void (*)(void *), void *));
    void    callout_stop __P((struct callout *));
    
    #endif /* KERNEL */
    
    #endif /* _SYS_CALLOUT_H_ */

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