source: rtems/cpukit/rtems/src/ratemoncreate.c @ 300f6a48

Last change on this file since 300f6a48 was 300f6a48, checked in by Sebastian Huber <sebastian.huber@…>, on Jun 22, 2016 at 3:09:23 PM

score: Rework thread priority management

Add priority nodes which contribute to the overall thread priority.

The actual priority of a thread is now an aggregation of priority nodes.
The thread priority aggregation for the home scheduler instance of a
thread consists of at least one priority node, which is normally the
real priority of the thread. The locking protocols (e.g. priority
ceiling and priority inheritance), rate-monotonic period objects and the
POSIX sporadic server add, change and remove priority nodes.

A thread changes its priority now immediately, e.g. priority changes are
not deferred until the thread releases its last resource.

Replace the _Thread_Change_priority() function with

  • _Thread_Priority_perform_actions(),
  • _Thread_Priority_add(),
  • _Thread_Priority_remove(),
  • _Thread_Priority_change(), and
  • _Thread_Priority_update().

Update #2412.
Update #2556.

  • Property mode set to 100644
File size: 2.0 KB
Line 
1/**
2 * @file
3 *
4 * @brief Create a Period
5 * @ingroup ClassicRateMon Rate Monotonic Scheduler
6 */
7
8/*
9 *  COPYRIGHT (c) 1989-2007.
10 *  On-Line Applications Research Corporation (OAR).
11 *
12 *  The license and distribution terms for this file may be
13 *  found in the file LICENSE in this distribution or at
14 *  http://www.rtems.org/license/LICENSE.
15 */
16
17#if HAVE_CONFIG_H
18#include "config.h"
19#endif
20
21#include <rtems/system.h>
22#include <rtems/rtems/status.h>
23#include <rtems/rtems/support.h>
24#include <rtems/score/isr.h>
25#include <rtems/rtems/ratemonimpl.h>
26#include <rtems/score/thread.h>
27#include <rtems/score/watchdogimpl.h>
28
29/*
30 *  rtems_rate_monotonic_create
31 *
32 *  This directive creates a rate monotonic timer and performs
33 *  some initialization.
34 *
35 *  Input parameters:
36 *    name - name of period
37 *    id   - pointer to rate monotonic id
38 *
39 *  Output parameters:
40 *    id               - rate monotonic id
41 *    RTEMS_SUCCESSFUL - if successful
42 *    error code       - if unsuccessful
43 */
44
45rtems_status_code rtems_rate_monotonic_create(
46  rtems_name  name,
47  rtems_id   *id
48)
49{
50  Rate_monotonic_Control *the_period;
51
52  if ( !rtems_is_name_valid( name ) )
53    return RTEMS_INVALID_NAME;
54
55  if ( !id )
56    return RTEMS_INVALID_ADDRESS;
57
58  the_period = _Rate_monotonic_Allocate();
59
60  if ( !the_period ) {
61    _Objects_Allocator_unlock();
62    return RTEMS_TOO_MANY;
63  }
64
65  _ISR_lock_Initialize( &the_period->Lock, "Rate Monotonic Period" );
66  _Priority_Node_initialize( &the_period->Priority, 0 );
67  _Priority_Node_set_inactive( &the_period->Priority );
68
69  the_period->owner = _Thread_Get_executing();
70  the_period->state = RATE_MONOTONIC_INACTIVE;
71
72  _Watchdog_Preinitialize( &the_period->Timer, _Per_CPU_Get_by_index( 0 ) );
73  _Watchdog_Initialize( &the_period->Timer, _Rate_monotonic_Timeout );
74
75  _Rate_monotonic_Reset_statistics( the_period );
76
77  _Objects_Open(
78    &_Rate_monotonic_Information,
79    &the_period->Object,
80    (Objects_Name) name
81  );
82
83  *id = the_period->Object.id;
84  _Objects_Allocator_unlock();
85  return RTEMS_SUCCESSFUL;
86}
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