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/**
* @file
*
* @brief Operation that is run when a timer expires
* @ingroup POSIX_INTERNAL_TIMERS Timers
*/
/*
* _POSIX_Timer_TSR
*
* 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.org/license/LICENSE.
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <time.h>
#include <pthread.h>
#include <signal.h>
#include <rtems/posix/time.h>
#include <rtems/posix/ptimer.h>
#include <rtems/posix/timerimpl.h>
#include <rtems/score/todimpl.h>
/*
* This is the operation that is run when a timer expires
*/
void _POSIX_Timer_TSR(
Objects_Id timer __attribute__((unused)),
void *data)
{
POSIX_Timer_Control *ptimer;
bool activated;
ptimer = (POSIX_Timer_Control *)data;
/* Increment the number of expirations. */
ptimer->overrun = ptimer->overrun + 1;
/* The timer must be reprogrammed */
if ( ( ptimer->timer_data.it_interval.tv_sec != 0 ) ||
( ptimer->timer_data.it_interval.tv_nsec != 0 ) ) {
activated = _POSIX_Timer_Insert_helper(
&ptimer->Timer,
ptimer->ticks,
ptimer->Object.id,
_POSIX_Timer_TSR,
ptimer
);
if ( !activated )
return;
/* Store the time when the timer was started again */
_TOD_Get( &ptimer->time );
/* The state really did not change but just to be safe */
ptimer->state = POSIX_TIMER_STATE_CREATE_RUN;
} else {
/* Indicates that the timer is stopped */
ptimer->state = POSIX_TIMER_STATE_CREATE_STOP;
}
/*
* The sending of the signal to the process running the handling function
* specified for that signal is simulated
*/
if ( pthread_kill ( ptimer->thread_id, ptimer->inf.sigev_signo ) ) {
_Assert( FALSE );
/*
* TODO: What if an error happens at run-time? This should never
* occur because the timer should be canceled if the thread
* is deleted. This method is being invoked from the Clock
* Tick ISR so even if we decide to take action on an error,
* we don't have many options. We shouldn't shut the system down.
*/
}
/* After the signal handler returns, the count of expirations of the
* timer must be set to 0.
*/
ptimer->overrun = 0;
}
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