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/*
* Convert abstime timeout to ticks
*/
/*
* COPYRIGHT (c) 1989-2007.
* 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.
*
* $Id$
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdarg.h>
#include <errno.h>
#include <fcntl.h>
#include <pthread.h>
#include <semaphore.h>
#include <limits.h>
#include <rtems/system.h>
#include <rtems/score/object.h>
#include <rtems/posix/semaphore.h>
#include <rtems/posix/time.h>
#include <rtems/seterr.h>
static boolean _Timespec_Is_valid(
const struct timespec *time
)
{
if ( !time )
return FALSE;
if ( time->tv_sec < 0 )
return FALSE;
if ( time->tv_nsec < 0 )
return FALSE;
if ( time->tv_nsec >= TOD_NANOSECONDS_PER_SECOND )
return FALSE;
return TRUE;
}
static boolean _Timespec_Less_than(
const struct timespec *lhs,
const struct timespec *rhs
)
{
if ( lhs->tv_sec < rhs->tv_sec )
return TRUE;
if ( lhs->tv_sec > rhs->tv_sec )
return FALSE;
/* ASSERT: lhs->tv_sec == rhs->tv_sec */
if ( lhs->tv_nsec < rhs->tv_nsec )
return TRUE;
return FALSE;
}
/*
* The abstime is a walltime. We turn it into an interval.
*/
POSIX_Absolute_timeout_conversion_results_t _POSIX_Absolute_timeout_to_ticks(
const struct timespec *abstime,
Watchdog_Interval *ticks_out
)
{
struct timespec current_time;
struct timespec difference;
/*
* Make sure there is always a value returned.
*/
*ticks_out = 0;
/*
* Is the absolute time even valid?
*/
if ( !_Timespec_Is_valid(abstime) )
return POSIX_ABSOLUTE_TIMEOUT_INVALID;
/*
* Is the absolute time in the past?
*/
clock_gettime( CLOCK_REALTIME, ¤t_time );
if ( _Timespec_Less_than( abstime, ¤t_time ) )
return POSIX_ABSOLUTE_TIMEOUT_IS_IN_PAST;
/*
* How long until the requested absolute time?
*/
_POSIX_Timespec_subtract( ¤t_time, abstime, &difference );
/*
* Internally the SuperCore uses ticks, so convert to them.
*/
*ticks_out = _POSIX_Timespec_to_interval( &difference );
/*
* If the difference was 0, then the future is now. It is so bright
* we better wear shades.
*/
if ( !*ticks_out )
return POSIX_ABSOLUTE_TIMEOUT_IS_NOW;
/*
* This is the case we were expecting and it took this long to
* get here.
*/
return POSIX_ABSOLUTE_TIMEOUT_IS_IN_FUTURE;
}
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