source: rtems/cpukit/rtems/src/taskvariableget.c @ 8ef3818

4.104.114.84.95
Last change on this file since 8ef3818 was df49c60, checked in by Joel Sherrill <joel.sherrill@…>, on 06/12/00 at 15:00:15

Merged from 4.5.0-beta3a

  • Property mode set to 100644
File size: 1.5 KB
Line 
1/*
2 *  rtems_task_variable_get - Get a per-task variable
3 *
4 *
5 *  COPYRIGHT (c) 1989-1999.
6 *  On-Line Applications Research Corporation (OAR).
7 *
8 *  The license and distribution terms for this file may be
9 *  found in the file LICENSE in this distribution or at
10 *  http://www.OARcorp.com/rtems/license.html.
11 *
12 *  $Id$
13 */
14
15#include <rtems/system.h>
16#include <rtems/rtems/tasks.h>
17#include <rtems/score/wkspace.h>
18
19/*
20 *  rtems_task_variable_get
21 *
22 *  This directive gets the value of a task variable.
23 */
24
25rtems_status_code rtems_task_variable_get(
26  rtems_id tid,
27  void **ptr,
28  void **result
29)
30{
31  Thread_Control        *the_thread;
32  Objects_Locations      location;
33  rtems_task_variable_t *tvp;
34
35  the_thread = _Thread_Get (tid, &location);
36  switch (location) {
37  case OBJECTS_REMOTE:
38#if defined(RTEMS_MULTIPROCESSING)
39    _Thread_Dispatch();
40    return RTEMS_ILLEGAL_ON_REMOTE_OBJECT;
41#endif
42
43  case OBJECTS_ERROR:
44    return RTEMS_INVALID_ID;
45
46  default:
47    return RTEMS_INTERNAL_ERROR;
48
49  case OBJECTS_LOCAL:
50
51    /*
52     *  Figure out if the variable is in this task's list.
53     */
54
55    tvp = the_thread->task_variables;
56    while (tvp) {
57      if (tvp->ptr == ptr) {
58        /*
59         * Should this return the current (i.e not the
60         * saved) value if `tid' is the current task?
61         */
62        *result = tvp->tval;
63        _Thread_Enable_dispatch();
64        return RTEMS_SUCCESSFUL;
65      }
66      tvp = tvp->next;
67    }
68    _Thread_Enable_dispatch();
69    return RTEMS_INVALID_ADDRESS;
70  }
71  return RTEMS_INTERNAL_ERROR;   /* unreached - only to remove warnings */
72}
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