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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [exec/] [rtems/] [src/] [ratemonperiod.c] - Blame information for rev 314

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1 30 unneback 
/*
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 *  Rate Monotonic Manager
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 *
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 *
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 *  COPYRIGHT (c) 1989-1999.
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 *  On-Line Applications Research Corporation (OAR).
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 *
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 *  The license and distribution terms for this file may be
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 *  found in the file LICENSE in this distribution or at
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 *  http://www.OARcorp.com/rtems/license.html.
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 *
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 *  $Id: ratemonperiod.c,v 1.2 2001-09-27 11:59:19 chris Exp $
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 */
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#include <rtems/system.h>
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#include <rtems/rtems/status.h>
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#include <rtems/rtems/support.h>
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#include <rtems/score/isr.h>
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#include <rtems/score/object.h>
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#include <rtems/rtems/ratemon.h>
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#include <rtems/score/thread.h>
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/*PAGE
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 *
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 *  rtems_rate_monotonic_period
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 *
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 *  This directive allows a thread to manipulate a rate monotonic timer.
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 *
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 *  Input parameters:
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 *    id     - rate monotonic id
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 *    length - length of period (in ticks)
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 *
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 *  Output parameters:
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 *    RTEMS_SUCCESSFUL - if successful
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 *    error code        - if unsuccessful
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 */
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rtems_status_code rtems_rate_monotonic_period(
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  Objects_Id        id,
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  rtems_interval    length
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)
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{
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  Rate_monotonic_Control              *the_period;
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  Objects_Locations                    location;
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  rtems_status_code                    return_value;
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  rtems_rate_monotonic_period_states   local_state;
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  ISR_Level                            level;
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  the_period = _Rate_monotonic_Get( id, &location );
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  switch ( location ) {
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    case OBJECTS_REMOTE:            /* should never return this */
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      return RTEMS_INTERNAL_ERROR;
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    case OBJECTS_ERROR:
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      return RTEMS_INVALID_ID;
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    case OBJECTS_LOCAL:
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      if ( !_Thread_Is_executing( the_period->owner ) ) {
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        _Thread_Enable_dispatch();
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        return RTEMS_NOT_OWNER_OF_RESOURCE;
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      }
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      if ( length == RTEMS_PERIOD_STATUS ) {
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        switch ( the_period->state ) {
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          case RATE_MONOTONIC_INACTIVE:
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            return_value = RTEMS_NOT_DEFINED;
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            break;
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          case RATE_MONOTONIC_ACTIVE:
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            return_value = RTEMS_SUCCESSFUL;
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            break;
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          case RATE_MONOTONIC_EXPIRED:
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            return_value = RTEMS_TIMEOUT;
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            break;
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          default:              /* unreached -- only to remove warnings */
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            return_value = RTEMS_INTERNAL_ERROR;
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            break;
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        }
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        _Thread_Enable_dispatch();
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        return( return_value );
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      }
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      _ISR_Disable( level );
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      switch ( the_period->state ) {
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        case RATE_MONOTONIC_INACTIVE:
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          _ISR_Enable( level );
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          the_period->state = RATE_MONOTONIC_ACTIVE;
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          _Watchdog_Initialize(
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            &the_period->Timer,
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            _Rate_monotonic_Timeout,
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            id,
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            NULL
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          );
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          the_period->owner_ticks_executed_at_period =
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            _Thread_Executing->ticks_executed;
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          the_period->time_at_period = _Watchdog_Ticks_since_boot;
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          _Watchdog_Insert_ticks( &the_period->Timer, length );
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          _Thread_Enable_dispatch();
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          return RTEMS_SUCCESSFUL;
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        case RATE_MONOTONIC_ACTIVE:
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          /*
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           *  This tells the _Rate_monotonic_Timeout that this task is
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           *  in the process of blocking on the period.
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           */
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          the_period->state = RATE_MONOTONIC_OWNER_IS_BLOCKING;
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          _ISR_Enable( level );
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          _Thread_Executing->Wait.id = the_period->Object.id;
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          _Thread_Set_state( _Thread_Executing, STATES_WAITING_FOR_PERIOD );
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          /*
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           *  Did the watchdog timer expire while we were actually blocking
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           *  on it?
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           */
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          _ISR_Disable( level );
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            local_state = the_period->state;
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            the_period->state = RATE_MONOTONIC_ACTIVE;
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          _ISR_Enable( level );
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          /*
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           *  If it did, then we want to unblock ourself and continue as
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           *  if nothing happen.  The period was reset in the timeout routine.
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           */
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          if ( local_state == RATE_MONOTONIC_EXPIRED_WHILE_BLOCKING )
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            _Thread_Clear_state( _Thread_Executing, STATES_WAITING_FOR_PERIOD );
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          _Thread_Enable_dispatch();
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          return RTEMS_SUCCESSFUL;
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          break;
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        case RATE_MONOTONIC_EXPIRED:
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          _ISR_Enable( level );
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          the_period->state = RATE_MONOTONIC_ACTIVE;
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          the_period->owner_ticks_executed_at_period =
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            _Thread_Executing->ticks_executed;
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          the_period->time_at_period = _Watchdog_Ticks_since_boot;
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          _Watchdog_Insert_ticks( &the_period->Timer, length );
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          _Thread_Enable_dispatch();
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          return RTEMS_TIMEOUT;
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        case RATE_MONOTONIC_OWNER_IS_BLOCKING:
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        case RATE_MONOTONIC_EXPIRED_WHILE_BLOCKING:
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          /*
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           *  These should never happen.
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           */
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          break;
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      }
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  }
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  return RTEMS_INTERNAL_ERROR;   /* unreached - only to remove warnings */
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}

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