taskissuspended.c

RTEMS (Real-Time Executive for Multiprocessor Systems) is a free open source real-time operating sys

/*
 *  RTEMS Task Manager
 *
 *
 *  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.rtems.com/license/LICENSE.
 *
 *  $Id: taskissuspended.c,v 1.3.6.1 2003/09/04 18:47:18 joel Exp $
 */

#include <rtems/system.h>
#include <rtems/rtems/status.h>
#include <rtems/rtems/support.h>
#include <rtems/rtems/modes.h>
#include <rtems/score/object.h>
#include <rtems/score/stack.h>
#include <rtems/score/states.h>
#include <rtems/rtems/tasks.h>
#include <rtems/score/thread.h>
#include <rtems/score/threadq.h>
#include <rtems/score/tod.h>
#include <rtems/score/userext.h>
#include <rtems/score/wkspace.h>
#include <rtems/score/apiext.h>
#include <rtems/score/sysstate.h>

/*PAGE
 *
 *  rtems_task_is_suspended
 *
 *  This directive returns a status indicating whether or not
 *  the specified task is suspended.
 *
 *  Input parameters:
 *    id - thread id
 *
 *  Output parameters:
 *    RTEMS_SUCCESSFUL        - if successful and not suspended
 *    RTEMS_ALREADY_SUSPENDED - if successful and suspended
 *    error code              - if unsuccessful
 */

rtems_status_code rtems_task_is_suspended(
  Objects_Id id
)
{
  register Thread_Control *the_thread;
  Objects_Locations        location;

  the_thread = _Thread_Get( id, &location );
  switch ( location ) {

    case OBJECTS_REMOTE:

#if defined(RTEMS_MULTIPROCESSING)
      _Thread_Dispatch();
      return RTEMS_ILLEGAL_ON_REMOTE_OBJECT;
#endif

    case OBJECTS_ERROR:
      return RTEMS_INVALID_ID;

    case OBJECTS_LOCAL:
      if ( !_States_Is_suspended( the_thread->current_state ) ) {
        _Thread_Enable_dispatch();
        return RTEMS_SUCCESSFUL;
      }
      _Thread_Enable_dispatch();
      return RTEMS_ALREADY_SUSPENDED;
  }

  return RTEMS_INTERNAL_ERROR;   /* unreached - only to remove warnings */
}