/**
 * @file rtems/posix/timer.h
 *
 * This include files defines the internal support for implementation of
 * POSIX Timers.
 */

/*
 *  COPYRIGHT (c) 1989-2011.
 *  On-Line Applications Research Corporation (OAR).
 *
 *  The license and distribution terms for this file may be
 *  found in the file LICENSE in this distribution or at
 *  http://www.rtems.com/license/LICENSE.
 *
 *  $Id$
 */

#ifndef _RTEMS_POSIX_TIMER_H
#define _RTEMS_POSIX_TIMER_H

#include <rtems/posix/config.h>
#include <rtems/score/object.h>
#include <rtems/score/watchdog.h> /* Watchdog_Control */

#ifdef __cplusplus
extern "C" {
#endif

/* Timer is free */
#define POSIX_TIMER_STATE_FREE        0x01

/* Created timer but not running          */
#define POSIX_TIMER_STATE_CREATE_NEW  0x02

/* Created timer and running              */
#define POSIX_TIMER_STATE_CREATE_RUN  0x03

/* Created, ran and stopped timer         */
#define POSIX_TIMER_STATE_CREATE_STOP 0x04

/* Indicates that the fire time is relative to the current one */
#define POSIX_TIMER_RELATIVE       0

/*
 * POSIX defines TIMER_ABSTIME but no constant for relative.  So
 * we have one internally but we need to be careful it has a different
 * value.
 */
#if (POSIX_TIMER_RELATIVE == TIMER_ABSTIME)
#error "POSIX_TIMER_RELATIVE == TIMER_ABSTIME"
#endif


/*
 * Data for a timer
 */
typedef struct {
  Objects_Control   Object;
  Watchdog_Control  Timer;      /* Internal Timer                        */
  pthread_t         thread_id;  /* Thread identifier                     */
  char              state;      /* State of the timer                    */
  struct sigevent   inf;        /* Information associated to the timer   */
  struct itimerspec timer_data; /* Timing data of the timer              */
  uint32_t          ticks;      /* Number of ticks of the initialization */
  uint32_t          overrun;    /* Number of expirations of the timer    */
  struct timespec   time;       /* Time at which the timer was started   */
} POSIX_Timer_Control;

/*
 *  _POSIX_Timers_Manager_initialization
 *
 *  DESCRIPTION:
 *
 *  This routine performs the initialization necessary for this manager.
 */
void _POSIX_Timer_Manager_initialization(void);

/*
 *  Timer TSR
 */
void _POSIX_Timer_TSR(Objects_Id timer, void *data);

/*
 *  Watchdog Insert helper
 */
bool _POSIX_Timer_Insert_helper(
  Watchdog_Control               *timer,
  Watchdog_Interval               ticks,
  Objects_Id                      id,
  Watchdog_Service_routine_entry  TSR,
  void                           *arg
);

/*
 *  The following defines the information control block used to manage
 *  this class of objects.
 */
POSIX_EXTERN Objects_Information  _POSIX_Timer_Information;

#ifndef __RTEMS_APPLICATION__
#include <rtems/posix/timer.inl>
#endif

#ifdef __cplusplus
}
#endif

#endif
/* end of include file */