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/*

 *  3.4.1 Schedule Alarm, P1003.1b-1993, p. 79

 *

 *  COPYRIGHT (c) 1989-1999.

 *  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.OARcorp.com/rtems/license.html.

 *

 *  $Id: alarm.c,v 1.2 2001-09-27 11:59:17 chris Exp $

 */

#include <pthread.h>

#include <errno.h>

#include <rtems/system.h>

#include <rtems/posix/pthread.h>

#include <rtems/posix/psignal.h>

unsigned int alarm(

  unsigned int seconds

)

{

  unsigned int      remaining = 0;

  Watchdog_Control *the_timer;

  the_timer = &_POSIX_signals_Alarm_timer;

  switch ( _Watchdog_Remove( the_timer ) ) {

    case WATCHDOG_INACTIVE:

    case WATCHDOG_BEING_INSERTED:

      break;

    case WATCHDOG_ACTIVE:

    case WATCHDOG_REMOVE_IT:

      /*

       *  The stop_time and start_time fields are snapshots of ticks since

       *  boot.  Since alarm() is dealing in seconds, we must account for

       *  this.

       */

      remaining = the_timer->initial -

       ((the_timer->stop_time - the_timer->start_time) / _TOD_Ticks_per_second);

      break;

  }

  _Watchdog_Insert_seconds( the_timer, seconds );

  return remaining;

}