source: rtems/cpukit/score/src/threadsettransient.c @ a55e305

4.11
Last change on this file since a55e305 was a55e305, checked in by Joel Sherrill <joel.sherrill@…>, on Jul 29, 2010 at 5:52:10 PM

2010-07-29 Gedare Bloom <giddyup44@…>

PR 1635/cpukit

  • sapi/src/exinit.c, score/Makefile.am, score/preinstall.am, score/include/rtems/score/bitfield.h, score/include/rtems/score/priority.h, score/include/rtems/score/thread.h, score/inline/rtems/score/priority.inl, score/inline/rtems/score/thread.inl, score/src/threadchangepriority.c, score/src/threadclearstate.c, score/src/threadready.c, score/src/threadresume.c, score/src/threadsetpriority.c, score/src/threadsetstate.c, score/src/threadsettransient.c, score/src/threadsuspend.c: Refactoring of priority handling, to isolate the bitmap implementation of priorities in the supercore so that priority management is a little more modular. This change is in anticipation of scheduler implementations that can select how they manage tracking priority levels / finding the highest priority ready task. Note that most of the changes here are simple renaming, to clarify the use of the bitmap-based priority management.
  • score/include/rtems/score/prioritybitmap.h, score/inline/rtems/score/prioritybitmap.inl: New files.
  • Property mode set to 100644
File size: 1.8 KB
Line 
1/*
2 *  Thread Handler
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 found in the file LICENSE in this distribution or at
10 *  http://www.rtems.com/license/LICENSE.
11 *
12 *  $Id$
13 */
14
15#if HAVE_CONFIG_H
16#include "config.h"
17#endif
18
19#include <rtems/system.h>
20#include <rtems/score/apiext.h>
21#include <rtems/score/context.h>
22#include <rtems/score/interr.h>
23#include <rtems/score/isr.h>
24#include <rtems/score/object.h>
25#include <rtems/score/priority.h>
26#include <rtems/score/states.h>
27#include <rtems/score/sysstate.h>
28#include <rtems/score/thread.h>
29#include <rtems/score/threadq.h>
30#include <rtems/score/userext.h>
31#include <rtems/score/wkspace.h>
32
33/*PAGE
34 *
35 *  _Thread_Set_transient
36 *
37 *  This kernel routine places the requested thread in the transient state
38 *  which will remove it from the ready queue, if necessary.  No
39 *  rescheduling is necessary because it is assumed that the transient
40 *  state will be cleared before dispatching is enabled.
41 *
42 *  Input parameters:
43 *    the_thread - pointer to thread control block
44 *
45 *  Output parameters:  NONE
46 *
47 *  INTERRUPT LATENCY:
48 *    only case
49 */
50
51void _Thread_Set_transient(
52  Thread_Control *the_thread
53)
54{
55  ISR_Level             level;
56  uint32_t              old_state;
57  Chain_Control *ready;
58
59  ready = the_thread->ready;
60  _ISR_Disable( level );
61
62  old_state = the_thread->current_state;
63  the_thread->current_state = _States_Set( STATES_TRANSIENT, old_state );
64
65  if ( _States_Is_ready( old_state ) ) {
66    if ( _Chain_Has_only_one_node( ready ) ) {
67
68      _Chain_Initialize_empty( ready );
69      _Priority_bit_map_Remove( &the_thread->Priority_map );
70
71    } else
72      _Chain_Extract_unprotected( &the_thread->Object.Node );
73  }
74
75  _ISR_Enable( level );
76
77}
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