text: /*
   * Copyright (c) 2017 François Tigeot
   * 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 unmodified, 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.
   *
   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
   */
  #ifndef _LINUX_HRTIMER_H_
  #define _LINUX_HRTIMER_H_
  
  #include <linux/ktime.h>
  #include <linux/list.h>
  #include <linux/wait.h>
  #include <linux/timer.h>
  
  enum hrtimer_mode {
  	HRTIMER_MODE_ABS = 0x0,
  	HRTIMER_MODE_REL = 0x1,
  };
  
  enum hrtimer_restart {
  	HRTIMER_NORESTART,	/* Timer is not restarted */
  	HRTIMER_RESTART,	/* Timer must be restarted */
  };
  
  struct hrtimer {
  	struct callout timer_callout;
  	clockid_t 		clock_id;
  	enum hrtimer_mode	ht_mode;
  	bool active;
  	enum hrtimer_restart	(*function)(struct hrtimer *);
  	struct lwkt_token timer_token;
  };
  
  extern void hrtimer_init(struct hrtimer *timer, clockid_t which_clock,
  			 enum hrtimer_mode mode);
  
  extern void hrtimer_start_range_ns(struct hrtimer *timer, ktime_t tim,
  				   u64 range_ns, const enum hrtimer_mode mode);
  
  extern int hrtimer_cancel(struct hrtimer *timer);
  
  extern bool hrtimer_active(const struct hrtimer *timer);
  
  #endif /* _LINUX_HRTIMER_H_ */
  