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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.
*
* $Id$
*/
#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;
}
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