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/*

 *  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.OARcorp.com/rtems/license.html.

 *

 *  $Id: tasksuspend.c,v 1.2 2001-09-27 11:59:19 chris 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_suspend

 *

 *  This directive will place the specified thread in the "suspended"

 *  state.  Note that the suspended state can be in addition to

 *  other waiting states.

 *

 *  Input parameters:

 *    id - thread id

 *

 *  Output parameters:

 *    RTEMS_SUCCESSFUL - if successful

 *    error code        - if unsuccessful

 */

rtems_status_code rtems_task_suspend(

  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)

      return _RTEMS_tasks_MP_Send_request_packet(

        RTEMS_TASKS_MP_SUSPEND_REQUEST,

        id,

        0,          /* Not used */

        0,          /* Not used */

      );

#endif

    case OBJECTS_ERROR:

      return RTEMS_INVALID_ID;

    case OBJECTS_LOCAL:

      if ( !_States_Is_suspended( the_thread->current_state ) ) {

        _Thread_Suspend( the_thread );

        _Thread_Enable_dispatch();

        return RTEMS_SUCCESSFUL;

      }

      _Thread_Enable_dispatch();

      return RTEMS_ALREADY_SUSPENDED;

  }

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

}