source: rtems/cpukit/score/src/threadclearstate.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: 2.5 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_Clear_state
36 *
37 *  This kernel routine clears the appropriate states in the
38 *  requested thread.  The thread ready chain is adjusted if
39 *  necessary and the Heir thread is set accordingly.
40 *
41 *  Input parameters:
42 *    the_thread - pointer to thread control block
43 *    state      - state set to clear
44 *
45 *  Output parameters:  NONE
46 *
47 *  INTERRUPT LATENCY:
48 *    priority map
49 *    select heir
50 */
51
52
53void _Thread_Clear_state(
54  Thread_Control *the_thread,
55  States_Control  state
56)
57{
58  ISR_Level       level;
59  States_Control  current_state;
60
61  _ISR_Disable( level );
62    current_state = the_thread->current_state;
63
64    if ( current_state & state ) {
65      current_state =
66      the_thread->current_state = _States_Clear( state, current_state );
67
68      if ( _States_Is_ready( current_state ) ) {
69
70        _Priority_bit_map_Add( &the_thread->Priority_map );
71
72        _Chain_Append_unprotected(the_thread->ready, &the_thread->Object.Node);
73
74        _ISR_Flash( level );
75
76        /*
77         *  If the thread that was unblocked is more important than the heir,
78         *  then we have a new heir.  This may or may not result in a
79         *  context switch.
80         *
81         *  Normal case:
82         *    If the current thread is preemptible, then we need to do
83         *    a context switch.
84         *  Pseudo-ISR case:
85         *    Even if the thread isn't preemptible, if the new heir is
86         *    a pseudo-ISR system task, we need to do a context switch.
87         */
88        if ( the_thread->current_priority < _Thread_Heir->current_priority ) {
89          _Thread_Heir = the_thread;
90          if ( _Thread_Executing->is_preemptible ||
91               the_thread->current_priority == 0 )
92            _Context_Switch_necessary = true;
93        }
94      }
95  }
96  _ISR_Enable( level );
97}
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