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/*

 *  rtems_task_variable_delete - Delete a per-task variable

 *

 *

 *  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: taskvariabledelete.c,v 1.2 2001-09-27 11:59:19 chris Exp $

 */

#include <rtems/system.h>

#include <rtems/rtems/tasks.h>

#include <rtems/score/wkspace.h>

/*

 *  rtems_task_variable_delete

 *

 *  This directive removes a task variable.

 */

rtems_status_code rtems_task_variable_delete(

  rtems_id  tid,

  void    **ptr

)

{

  Thread_Control        *the_thread;

  Objects_Locations      location;

  rtems_task_variable_t *tvp, *prev;

  prev = NULL;

  the_thread = _Thread_Get (tid, &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;

  default:

    return RTEMS_INTERNAL_ERROR;

  case OBJECTS_LOCAL:

    tvp = the_thread->task_variables;

    while (tvp) {

      if (tvp->ptr == ptr) {

        if (prev) prev->next = tvp->next;

        else      the_thread->task_variables = tvp->next;

        if (_Thread_Is_executing (the_thread))

          *tvp->ptr = tvp->gval;

        _Thread_Enable_dispatch();

        _Workspace_Free(tvp);

        return RTEMS_SUCCESSFUL;

      }

      prev = tvp;

      tvp = tvp->next;

    }

    _Thread_Enable_dispatch();

    return RTEMS_INVALID_ADDRESS;

  }

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

}