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/**
* @file
*
* @brief System Generates Signal for process after realtime seconds elapsed
* @ingroup POSIXAPI
*/
/*
* 3.4.1 Schedule Alarm, P1003.1b-1993, p. 79
*/
/* COPYRIGHT (c) 1989-2013.
* 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.org/license/LICENSE.
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <unistd.h>
#include <rtems/posix/pthreadimpl.h>
#include <rtems/posix/psignalimpl.h>
#include <rtems/score/threaddispatch.h>
#include <rtems/score/todimpl.h>
#include <rtems/score/watchdogimpl.h>
/*
* _POSIX_signals_Alarm_TSR
*/
static void _POSIX_signals_Alarm_TSR(
Objects_Id id __attribute__((unused)),
void *argument __attribute__((unused))
)
{
#if defined(RTEMS_DEBUG)
int status;
#define KILL_STATUS status =
#else
#define KILL_STATUS (void)
#endif
KILL_STATUS kill( getpid(), SIGALRM );
#if defined(RTEMS_DEBUG)
/*
* There is no reason to think this might fail but we should be
* cautious.
*/
_Assert(status == 0);
#endif
}
static Watchdog_Control _POSIX_signals_Alarm_timer = WATCHDOG_INITIALIZER(
_POSIX_signals_Alarm_TSR,
0,
NULL
);
unsigned int alarm(
unsigned int seconds
)
{
unsigned int remaining = 0;
Watchdog_Control *the_timer;
Watchdog_States state;
the_timer = &_POSIX_signals_Alarm_timer;
_Thread_Disable_dispatch();
state = _Watchdog_Remove_seconds( the_timer );
if ( (state == WATCHDOG_ACTIVE) || (state == 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);
}
if ( seconds )
_Watchdog_Insert_seconds( the_timer, seconds );
_Thread_Enable_dispatch();
return remaining;
}
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