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

     /*-
      * SPDX-License-Identifier: BSD-4-Clause
      *
      * Copyright (c) 2005 David Xu <davidxu@freebsd.org>
      * Copyright (c) 1994 by Chris Provenzano, proven@mit.edu
      * All rights reserved.
      *
      * 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 Chris Provenzano.
     * 4. The name of Chris Provenzano may not be used to endorse or promote
     *    products derived from this software without specific prior written
     *    permission.
     *
     * THIS SOFTWARE IS PROVIDED BY CHRIS PROVENZANO ``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 CHRIS PROVENZANO 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.
     *
     * $FreeBSD$
     *
     * Description : Basic timers header.
     */
    
    #ifndef _SYS_TIMERS_H_
    #define _SYS_TIMERS_H_
    
    #include <sys/time.h>
    
    #ifdef _KERNEL
    /*
     * Structures used to manage POSIX timers in a process.
     */
    struct itimer {
            struct mtx              it_mtx;
            struct sigevent         it_sigev;
            struct itimerspec       it_time;
            struct proc             *it_proc;
            int     it_flags;
            int     it_usecount;
            int     it_overrun;             /* Overruns currently accumulating */
            int     it_overrun_last;        /* Overruns associated w/ a delivery */
            int     it_clockid;
            ksiginfo_t      it_ksi;
            struct callout it_callout;
    };
    
    #define ITF_DELETING    0x01
    #define ITF_WANTED      0x02
    #define ITF_PSTOPPED    0x04
    
    #define TIMER_MAX       32
    
    #define ITIMER_LOCK(it)         mtx_lock(&(it)->it_mtx)
    #define ITIMER_UNLOCK(it)       mtx_unlock(&(it)->it_mtx)
    
    struct  itimers {
            struct itimer           *its_timers[TIMER_MAX];
    };
    
    struct  kclock {
            int (*timer_create)(struct itimer *timer);
            int (*timer_settime)(struct itimer * timer, int flags,
                    struct itimerspec * new_value,
                    struct itimerspec * old_value);
            int (*timer_delete)(struct itimer * timer);
            int (*timer_gettime)(struct itimer * timer,
                    struct itimerspec * cur_value);
    };
    
    void    itimers_exec(struct proc *p);
    void    itimers_exit(struct proc *p);
    int     itimer_accept(struct proc *p, int tid, ksiginfo_t *ksi);
    #endif
    #endif /* !_SYS_TIMERS_H_ */

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