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/*
 *  rtems_task_variable_add - Add 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: taskvariableadd.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_add
 *
 *  This directive registers a task variable. 
 */
 
rtems_status_code rtems_task_variable_add(
  rtems_id tid,
  void **ptr,
  void (*dtor)(void *)
)
{
  Thread_Control        *the_thread;
  Objects_Locations      location;
  rtems_task_variable_t *tvp, *new;
 
  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:
 
    /*
     *  Figure out if the variable is already in this task's list.
     */
 
    tvp = the_thread->task_variables;
    while (tvp) {
      if (tvp->ptr == ptr) {
	tvp->dtor = dtor;
        _Thread_Enable_dispatch();
        return RTEMS_SUCCESSFUL;
      }
      tvp = tvp->next;
    }
 
    /*
     *  Now allocate memory for this task variable.
     */
 
    new = (rtems_task_variable_t *)
       _Workspace_Allocate(sizeof(rtems_task_variable_t));
    if (new == NULL) {
      _Thread_Enable_dispatch();
      return RTEMS_NO_MEMORY;
    }
    new->gval = *ptr;
    new->ptr = ptr;
    new->dtor = dtor;
 
    new->next = the_thread->task_variables;
    the_thread->task_variables = new;
    _Thread_Enable_dispatch();
    return RTEMS_SUCCESSFUL;
  }
  return RTEMS_INTERNAL_ERROR;   /* unreached - only to remove warnings */
}