blob: f823a7b35db9f9e5a20abbed1bc1c2255f7a23b6 (
plain) (
tree)
|
|
/*
* Timer Manager - rtems_timer_fire_after directive
*
*
* 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.
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/system.h>
#include <rtems/rtems/status.h>
#include <rtems/rtems/support.h>
#include <rtems/score/object.h>
#include <rtems/score/thread.h>
#include <rtems/rtems/timer.h>
#include <rtems/score/tod.h>
#include <rtems/score/watchdog.h>
/*
* rtems_timer_fire_after
*
* This directive allows a thread to start a timer.
*
* Input parameters:
* id - timer id
* ticks - interval until routine is fired
* routine - routine to schedule
* user_data - passed as argument to routine when it is fired
*
* Output parameters:
* RTEMS_SUCCESSFUL - if successful
* error code - if unsuccessful
*/
rtems_status_code rtems_timer_fire_after(
rtems_id id,
rtems_interval ticks,
rtems_timer_service_routine_entry routine,
void *user_data
)
{
Timer_Control *the_timer;
Objects_Locations location;
ISR_Level level;
if ( ticks == 0 )
return RTEMS_INVALID_NUMBER;
if ( !routine )
return RTEMS_INVALID_ADDRESS;
the_timer = _Timer_Get( id, &location );
switch ( location ) {
case OBJECTS_LOCAL:
(void) _Watchdog_Remove( &the_timer->Ticker );
_ISR_Disable( level );
/*
* Check to see if the watchdog has just been inserted by a
* higher priority interrupt. If so, abandon this insert.
*/
if ( the_timer->Ticker.state != WATCHDOG_INACTIVE ) {
_ISR_Enable( level );
_Thread_Enable_dispatch();
return RTEMS_SUCCESSFUL;
}
/*
* OK. Now we now the timer was not rescheduled by an interrupt
* so we can atomically initialize it as in use.
*/
the_timer->the_class = TIMER_INTERVAL;
_Watchdog_Initialize( &the_timer->Ticker, routine, id, user_data );
_ISR_Enable( level );
_Watchdog_Insert_ticks( &the_timer->Ticker, ticks );
_Thread_Enable_dispatch();
return RTEMS_SUCCESSFUL;
#if defined(RTEMS_MULTIPROCESSING)
case OBJECTS_REMOTE: /* should never return this */
#endif
case OBJECTS_ERROR:
break;
}
return RTEMS_INVALID_ID;
}
|