usr/src/sys/h/callout.h

/*
 * Copyright (c) 1982, 1986 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 *
 *      @(#)callout.h   7.1 (Berkeley) 6/4/86
 */

/*
 * The callout structure is for
 * a routine arranging
 * to be called by the clock interrupt
 * (clock.c) with a specified argument,
 * in a specified amount of time.
 * Used, for example, to time tab
 * delays on typewriters.
 */

struct  callout {
        int     c_time;         /* incremental time */
        caddr_t c_arg;          /* argument to routine */
        int     (*c_func)();    /* routine */
        struct  callout *c_next;
};
#ifdef KERNEL
struct  callout *callfree, *callout, calltodo;
int     ncallout;
#endif