taskdelete.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: taskdelete.c,v 1.2.6.1 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_delete
 *
 *  This directive allows a thread to delete itself or the thread
 *  identified in the id field.  The executive halts execution
 *  of the thread and frees the thread control block.
 *
 *  Input parameters:
 *    id - thread id
 *
 *  Output parameters:
 *    nothing           - if id is the requesting thread (always succeeds)
 *    RTEMS_SUCCESSFUL - if successful and id is
 *                           not the requesting thread
 *    error code        - if unsuccessful
 */

rtems_status_code rtems_task_delete(
  Objects_Id id
)
{
  register Thread_Control *the_thread;
  Objects_Locations        location;
  Objects_Information     *the_information;

  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:
      the_information = _Objects_Get_information( the_thread->Object.id );

      if ( !the_information ) {
        _Thread_Enable_dispatch();
        return RTEMS_INVALID_ID;
        /* This should never happen if _Thread_Get() works right */
      }
  
      _Thread_Close( the_information, the_thread );

      _RTEMS_tasks_Free( the_thread );

#if defined(RTEMS_MULTIPROCESSING)
      if ( the_thread->is_global ) {

        _Objects_MP_Close( &_RTEMS_tasks_Information, the_thread->Object.id );

        _RTEMS_tasks_MP_Send_process_packet(
          RTEMS_TASKS_MP_ANNOUNCE_DELETE,
          the_thread->Object.id,
          0                                /* Not used */
        );
      }
#endif

      _Thread_Enable_dispatch();
      return RTEMS_SUCCESSFUL;
  }

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